Network Working Group O. Nicklass
Request for Comments: 5604 RADVISION Ltd.
Category: Standards Track July 2009
Managed Objects for Time Division Multiplexing (TDM)
over Packet Switched Networks (PSNs)
Abstract
This memo defines a portion of the Management Information Base (MIB)
for use with network management protocols in the Internet community.
In particular, it describes managed objects for pseudowire
encapsulation for structured or unstructured Time-Division
Multiplexing (TDM) (T1, E1, T3, E3) circuits over a Packet Switched
Network (PSN).
Status of This Memo
This document specifies an Internet standards track protocol for the
Internet community, and requests discussion and suggestions for
improvements. Please refer to the current edition of the "Internet
Official Protocol Standards" (STD 1) for the standardization state
and status of this protocol. Distribution of this memo is unlimited.
Copyright Notice
Copyright (c) 2009 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents in effect on the date of
publication of this document (http://trustee.ietf.org/license-info).
Please review these documents carefully, as they describe your rights
and restrictions with respect to this document.
This document may contain material from IETF Documents or IETF
Contributions published or made publicly available before November
10, 2008. The person(s) controlling the copyright in some of this
material may not have granted the IETF Trust the right to allow
modifications of such material outside the IETF Standards Process.
Without obtaining an adequate license from the person(s) controlling
the copyright in such materials, this document may not be modified
outside the IETF Standards Process, and derivative works of it may
not be created outside the IETF Standards Process, except to format
it for publication as an RFC or to translate it into languages other
than English.
Nicklass Standards Track [Page 1]RFC 5604 Manage TDM over PSN July 2009
Table of Contents
1. Introduction ....................................................2
2. Conventions .....................................................3
3. Terminology .....................................................3
4. The Internet-Standard Management Framework ......................4
5. Overview ........................................................4
6. TDM MIB Module Usage ............................................4
6.1. Structure of TDM MIB .......................................4
6.2. TDM Connection Configuration Procedure .....................5
6.3. TDM PW Monitoring ..........................................6
7. Example of Actual TDM PW Setup ..................................6
8. Object Definition ...............................................9
9. Security Considerations ........................................37
10. IANA Considerations ...........................................39
11. References ....................................................39
11.1. Normative References .....................................39
11.2. Informative References ...................................40
12. Acknowledgements ..............................................41
1. Introduction
This document describes a model for managing TDM pseudowires, i.e.,
TDM data encapsulated for transmission over a Packet Switched Network
(PSN). The term TDM in this document is limited to the scope of
Plesiochronous Digital Hierarchy (PDH). It is currently specified to
carry any TDM Signals in either Structure Agnostic Transport mode
(E1, T1, E3, and T3) or in Structure Aware Transport mode (E1, T1,
and NxDS0) as defined in the Pseudowire Emulation Edge-to-Edge (PWE3)
TDM Requirements document [RFC4197].
This document is closely related to [SATOP], [TDMOIP], and [CESOPSN],
which describe the encapsulation of TDM signals and provide the
Circuit Emulation Service over a PSN.
The TDM management model consists of several MIB modules, following
the layering model described in the PWE3 Architecture document
[RFC3985]. The TDM MIB module described in this document works
closely with the MIB modules described in [DS3MIB], [DS1MIB],
[DS0MIB], [IFMIB], [PWMIB], and with the textual conventions defined
in [PWTC]. The conceptual layering and relationship among all those
is described in Figure 1 below. A TDM connection will be a
pseudowire (PW) connection. It will not be treated as an interface
and will therefore not be represented in the ifTable.
Nicklass Standards Track [Page 2]RFC 5604 Manage TDM over PSN July 2009
Figure 1: Conceptual Layering
+-------------------+
| TDM MIB | DS1MIB, DS3MIB,
+-------------------+ DS0MIB
|
+-------------------+ PW-TDM-MIB,
Service | TDM PW MIB | PW-CESOPSN-MIB,
Layer +-------------------+ PW-TDMOIP-MIB
- - - - - - - - - - - | - - - - - - - - - - - - - - -
Generic +-------------------+
PW | Generic PW MIBS | PW-TC-MIB,
Layer +-------------------+ PW-MIB
- - - - - - - - - - - -| - - - - - - - - - - - - - - -
+-------------------+
PSN VC | MPLS VC MIBS | PW-MPLS-MIB
Layer +-------------------+
- - - - - - - - - - - -| - - - - - - - - - - - - - - -
+-------------------+
PSN | MPLS MIBs | MPLS-TE-STD-MIB,
Layer +-------------------+ MPLS-LSR-STD-MIB
2. Conventions
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC 2119 [BCP14].
3. Terminology
The basic terminology used to refer to transmission direction in this
document is taken from [SATOP], which describes a mechanism for
transporting Structure-Agnostic (TDM) bit-streams over a packet-
oriented network. To simplify this document, the terminology is used
for structured and unstructured TDM as well.
"PSN-bound" references the traffic direction where TDM data is
received, adapted to the packet based on the number of payload bytes
per packet, assigned a relevant TDM header (sequence numbers, flags,
and timestamps (if the RTP header is used)), prepended multiplexing
layer and PSN headers, and sent into the PSN.
Conversely, the "CE-bound" references the traffic direction where
packets are received from the PSN, packet payloads are reassembled by
including a jitter buffer where payload of the received TDM packets
Nicklass Standards Track [Page 3]RFC 5604 Manage TDM over PSN July 2009
is stored prior to play out to the TDM line. The size of this buffer
SHOULD be locally configurable to allow accommodation to the PSN-
specific packet delay variation.
The CE-bound TDM interworking function (IWF) SHOULD use the sequence
number in the control word for the detection of lost (Loss of Packet
State (LOPS)) and mis-ordered packets. If the RTP header is used,
the RTP sequence numbers MAY be used for the same purposes.
4. The Internet-Standard Management Framework
For a detailed overview of the documents that describe the current
Internet-Standard Management Framework, please refer to section 7 of
RFC 3410 [RFC3410].
Managed objects are accessed via a virtual information store, termed
the Management Information Base or MIB. MIB objects are generally
accessed through the Simple Network Management Protocol (SNMP).
Objects in the MIB are defined using the mechanisms defined in the
Structure of Management Information (SMI). This memo specifies a MIB
module that is compliant to the SMIv2, which is described in STD 58,
RFC 2578 [RFC2578], STD 58, RFC 2579 [RFC2579] and STD 58, RFC 2580
[RFC2580].
5. Overview
This MIB module is designed to satisfy the following requirements and
constraints:
1. Fit within the architecture defined by [RFC3985] and [PWMIB].
2. Support edge-to-edge emulation of any TDM connections.
3. Configure the connection. The connection-specific behavior is
provided via the supplement MIB modules.
4. Report various alarms, counters, and status objects.
6. TDM MIB Module Usage
6.1. Structure of TDM MIB
The MIB consists of five tables;
- The TDM PW Table (pwTDMTable) contains generic TDM information
regarding the PW connection. It contains the ifIndex of the TDM
interface, an index to an entry in the generic configuration table
Nicklass Standards Track [Page 4]RFC 5604 Manage TDM over PSN July 2009
(pwTDMCfgTable), an index to an entry in the specific configuration
table (pwCXXXCfgTable, where XXX can be TDMoIP (TDM over IP) or
CESoPSN (Circuit Emulation Service over PSN)), config error
indications, and various status indications. The two indices of
the two configuration tables are providing the connection
parameters. The TDM interface can be a full link of any TDM type
like E1 or DS3, for example, or the interface of the bundle holding
the collection of time slots to be transmitted. Based on the TDM
PW type, the relevant pwXXXCfgTable from the relevant MIB module
will be used. The specific types are:
o 17 Structure-agnostic E1 over Packet
o 18 Structure-agnostic T1 (DS1) over Packet
o 19 Structure-agnostic E3 over Packet
o 20 Structure-agnostic T3 (DS3) over Packet
o 21 CESoPSN basic mode (XXX=CESoPSN)
o 22 TDMoIP AAL1mode (XXX=TDMoIP)
o 23 CESoPSN TDM with CAS (XXX=CESoPSN)
o 24 TDMoIP AAL2 Mode (XXX=TDMoIP)
- The TDM Generic Parameter Table (pwTDMCfgTable) contains TDM
generic configurable parameters for any TDM type.
- The TDM Performance Current Table (pwTDMPerfCurrentTable) contains
TDM statistics for the current 15-minute period.
- The TDM Performance Interval Table (pwTDMPerfIntervalTable)
contains TDM statistics for historical intervals (usually 96 15-
minute entries to cover a 24 hour period).
- The TDM Performance One-Day Interval Table
(pwTDMPerf1DayIntervalTable) contains TDM statistics for historical
intervals accumulated per day. Usually 30 one-day entries to cover
a monthly period.
6.2. TDM Connection Configuration Procedure
Configuring a TDM PW involves the following steps:
First, configure the parameters of the interface-specific layer using
the DS1-MIB and or the DS3-MIB.
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Next, if applicable, create a bundle of time slots using the DS0
Bundle MIB [DS0MIB].
Next, create an entry in the pwTable and configure the PSN tunnels:
- Follow steps as defined in [PWMIB].
NOTE: The agent should create an entry in the pwTDMTable for any
entry created in the pwTable with pwType equal to a value between
(17) and (24).
Next complete the TDM PW configuration:
- If necessary, create an entry in the relevant pwXXXCfgTable and in
the pwTDMTable (suitable entries may already exist in both tables).
- Set the index of the relevant pwXXXCfgTable entry and of the
relevant pwTDMCfgTable entry in the pwTDMTable.
6.3. TDM PW Monitoring
Upon making the TDM PW operational, the pwTDMPerfCurrentTable,
pwTDMPerfIntervalTable, and PwTDMPerf1DayIntervalTable can be used to
monitor the various counters, indicators, and conditions of the PW.
All performance parameters are accumulated in daily intervals and in
15-minute intervals. The number of daily intervals kept by the agent
is based on the specific implementation. The 15-minute intervals, up
to 96 intervals (24 hours worth), are all kept by the agent. Fewer
than 96 intervals of data will be available if the agent has been
restarted within the last 24 hours. Performance parameters continue
to be collected when the interface is down. There is no requirement
for an agent to ensure a fixed relationship between the start of a
15-minute interval and any wall clock; however, some agents may align
the 15-minute intervals with quarter hours. Performance parameters
are of types PerfCurrentCount and PerfIntervalCount. These textual
conventions are all Gauge32, and they are used because it is possible
for these objects to decrease.
7. Example of Actual TDM PW Setup
This section provides an example of using the various MIB objects
described in the following section to set up a TDM PW connection.
The first example is setting a connection of DS1 type. The second
example is setting a connection with a bandwidth of 3 DS0 (time
slots).
Nicklass Standards Track [Page 6]RFC 5604 Manage TDM over PSN July 2009
While those examples are not meant to illustrate all options of the
MIB, they are intended as an aid to understanding some of the key
concepts. See [PWMIB] for an example of setting up PSN tunnels.
First example:
1. Configure the DS1 interface using DS1-MIB.
2. If needed, create an entry in the pwTDMCfgTable (assuming index =
10); verify that there are no errors in the configuration using
the relevant object.
3. Get a new pwIndexNext [PWMIB] and create a new pwTable entry
using the value of pwIndexNext (assume here, the PW index = 20).
4. Set the pwType [PWMIB] of the new entry to the relevant value
(17) or (18). This should create a new entry in the pwTDMTable.
5. Configure the newly created TDM PW with the required pointers,
indices, and the relevant entry in pwTDMCfgTable (index 10).
In [DS1MIB] dsx1IfIndex (ifIndex = 5)
In pwTDMCfgTable entry: Set the connection characteristic
parameters:
{
pwTDMCfgPayloadSize = 43 -- payload bytes
pwTDMCfgPktReorder = FALSE
pwTDMCfgRtpHdrUsed = FALSE
pwTDMCfgJtrBfrDepth = 30000 -- micro-seconds
}
In pwTDMTable entry: Set the relevant ifIndex, the generic TDM
index, and the specific TDM index to complete creation:
{
pwTDMIfIndex = 5 -- IfIndex of associated entry
-- in DS1 table
pwGenTDMCfgIndex = 10 -- Index of associated entry
-- in pwTDMCfgTable.
pwRelTDMCfgIndex = 0 -- No Index in associated entry
-- in pwXXXCfgTable.
}
Verify that there are no error bits set in pwTDMConfigError.
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Second example:
1. Configure the DS1 interface using DS1-MIB.
2. Set up a bundle and get its dsx0BundleIfIndex. Setting up the
bundle should involve using IFMIB properly.
3. Since structured TDMoIP circuit is defined, the next MIB module
to be used is TDMoIP-MIB.
4. If needed, create an entry in the pwTDMCfgTable (assuming index =
7).
5. If needed, create an entry in the pwXXXCfgTable (index = 11).
XXX can be TDMoIP or CESoPSN.
6. Verify that there are no errors in the configuration using the
relevant object when signaling is in use.
7. Get a new pwIndexNext [PWMIB] and create a new pwTable entry
using the value of pwIndexNext.
8. Set the pwType [PWMIB] of the new entry to (24). This should
create a new entry in the pwTDMTable.
9. Configure the newly created TDM PW with the required pointers,
indices, and the relevant entries in pwTDMCfgTable and in
pwXXXCfgTable (assuming indices 7 and 11).
In [DS1MIB] dsx1IfIndex (ifIndex) = 5
In [DS0MIB] dsx0BundleIfIndex = 8
In pwTDMTable entry: Set the relevant ifIndex, the generic
TDM index, and the specific TDM index to complete creation:
{
pwTDMIfIndex = 8 -- IfIndex of associated entry
-- in DS0 table
pwGenTDMCfgIndex = 7 -- Index of associated entry
-- in pwTDMCfgTable.
pwRelTDMCfgIndex = 11 -- Index of associated entry
-- in pwXXXCfgTable.
-- pwXXXCfgTable might be an implementation specific table too.
}
Verify that there are no error bits set in pwTDMConfigError.
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8. Object Definition
PW-TDM-MIB DEFINITIONS ::= BEGIN
IMPORTS
MODULE-IDENTITY, OBJECT-TYPE,
Integer32, Counter32, Unsigned32, mib-2
FROM SNMPv2-SMI
MODULE-COMPLIANCE, OBJECT-GROUP
FROM SNMPv2-CONF
TEXTUAL-CONVENTION, TruthValue, RowStatus, StorageType,
TimeStamp
FROM SNMPv2-TC
InterfaceIndexOrZero
FROM IF-MIB -- [IFMIB]
SnmpAdminString
FROM SNMP-FRAMEWORK-MIB -- [RFC3411]
PerfCurrentCount, PerfIntervalCount
FROM PerfHist-TC-MIB
pwIndex
FROM PW-STD-MIB
PwCfgIndexOrzero
FROM PW-TC-STD-MIB;
-- The TDM MIB
pwTDMMIB MODULE-IDENTITY
LAST-UPDATED "200906150000Z"
ORGANIZATION "Pseudo-Wire Emulation Edge-to-Edge (PWE3)
Working Group"
CONTACT-INFO
" Orly Nicklass
Postal: RADVISION Ltd.
24Raul Wallenberg St.
Tel Aviv, Israel
Email: orlyn@radvision.com
The PWE3 Working Group (email distribution pwe3@ietf.org,
http://www.ietf.org/html.charters/pwe3-charter.html)
"
Nicklass Standards Track [Page 9]RFC 5604 Manage TDM over PSN July 2009
DESCRIPTION
"This MIB contains managed object definitions for
encapsulating TDM (T1,E1, T3, E3, NxDS0) as
pseudo-wires over packet-switching networks (PSN).
This MIB supplements the PW-STD-MIB as in: Zelig, D.,
Nadeau, T. 'Pseudowire (PW) Management Information Base'.
The PW-STD-MIB contains structures and MIB associations
generic to pseudowire (PW) emulation. PW-specific
MIBs (such as this) contain config and stats for specific
PW types.
Copyright (c) 2009 IETF Trust and the persons identified as
authors of the code. All rights reserved.
Redistribution and use in source and binary forms, with or
without modification, are permitted provided that the
following conditions are met:
- Redistributions of source code must retain the above
copyright notice, this list of conditions and the
following disclaimer.
- Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following
disclaimer in the documentation and/or other materials
provided with the distribution.
- Neither the name of Internet Society, IETF or IETF Trust,
nor the names of specific contributors, may be used to
endorse or promote products derived from this software
without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
CONTRIBUTORS 'AS IS' AND ANY EXPRESS OR IMPLIED WARRANTIES,
INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
This version of this MIB module is part of RFC 5604;
Nicklass Standards Track [Page 10]RFC 5604 Manage TDM over PSN July 2009
see the RFC itself for full legal notices.
"
REVISION "200906150000Z"
DESCRIPTION
"Initial version published as part of RFC 5604."
::= { mib-2 186 }
-- Local Textual conventions
PwTDMCfgIndex ::= TEXTUAL-CONVENTION
STATUS current
DESCRIPTION
"Index into the relevant pwXXXCfgTable."
SYNTAX Unsigned32 (1..4294967295)
-- Notifications
pwTDMNotifications OBJECT IDENTIFIER
::= { pwTDMMIB 0 }
-- Tables, Scalars
pwTDMObjects OBJECT IDENTIFIER
::= { pwTDMMIB 1 }
-- Conformance
pwTDMConformance OBJECT IDENTIFIER
::= { pwTDMMIB 2 }
-- TDM PW table
pwTDMTable OBJECT-TYPE
SYNTAX SEQUENCE OF PwTDMEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This table contains basic information including the
ifIndex and pointers to entries in the relevant TDM
config tables for this TDM PW."
::= { pwTDMObjects 1 }
pwTDMEntry OBJECT-TYPE
SYNTAX PwTDMEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This table is indexed by the same index that was
created for the associated entry in the PW Table
(in the PW-STD-MIB).
- The PwIndex.
Nicklass Standards Track [Page 11]RFC 5604 Manage TDM over PSN July 2009
An entry is created in this table by the agent for every
entry in the pwTable with a pwType equal to one of the
following:
e1Satop(17), t1Satop(18), e3Satop(19), t3Satop(20),
basicCesPsn(21), basicTdmIp(22), tdmCasCesPsn(23),
or tdmCasTdmIp(24).
Unless otherwise specified, all writeable objects in this
table MUST NOT be changed after row activation in the
generic pwTable (see [PWMIB]) and values must persist
after reboot."
INDEX { pwIndex }
::= { pwTDMTable 1 }
PwTDMEntry ::= SEQUENCE {
pwTDMRate Integer32,
pwTDMIfIndex InterfaceIndexOrZero,
pwGenTDMCfgIndex PwCfgIndexOrzero,
pwRelTDMCfgIndex PwCfgIndexOrzero,
pwTDMConfigError BITS,
pwTDMTimeElapsed Integer32,
pwTDMValidIntervals Integer32,
pwTDMValidDayIntervals Integer32,
pwTDMLastEsTimeStamp TimeStamp
}
pwTDMRate OBJECT-TYPE
SYNTAX Integer32
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"The parameter represents the bit-rate of the TDM service
in multiples of the 'basic' 64 Kbit/s rate [TDMCP-EXT].
It complements the definition of pwType used in
PW-STD-MIB.
For structure-agnostic mode, the following should be used:
a) (Structure-Agnostic TDM over Packet) Satop E1 - 32
b) Satop T1 emulation:
i) MUST be set to 24 in the basic emulation mode
ii) MUST be set to 25 for the 'Octet-aligned T1'
emulation mode
c) Satop E3 - 535
d) Satop T3 - 699
For all kinds of structure-aware emulation, this parameter
MUST be set to N where N is the number of DS0 channels
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in the corresponding attachment circuit."
REFERENCE
"TDMCP-EXT"
DEFVAL { 32 }
::= { pwTDMEntry 1 }
pwTDMIfIndex OBJECT-TYPE
SYNTAX InterfaceIndexOrZero
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"This is a unique index within the ifTable. It represents
the interface index of the full link or the interface
index for the bundle holding the group of
time slots to be transmitted via this PW connection.
A value of zero indicates an interface index that has yet
to be determined.
Once set, if the TDM ifIndex is (for some reason) later
removed, the agent SHOULD delete the associated PW rows
(e.g., this pwTDMTable entry). If the agent does not
delete the rows, the agent MUST set this object to
zero."
::= { pwTDMEntry 2 }
pwGenTDMCfgIndex OBJECT-TYPE
SYNTAX PwCfgIndexOrzero
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"Index to the generic parameters in the TDM configuration
table that appears in this MIB module. It is likely that
multiple TDM PWs of the same characteristic will share
a single TDM Cfg entry."
::= { pwTDMEntry 3 }
pwRelTDMCfgIndex OBJECT-TYPE
SYNTAX PwCfgIndexOrzero
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"Index to the relevant TDM configuration table entry
that appears in one of the related MIB modules
such as TDMoIP or CESoPSN. It is likely that
multiple TDM PWs of the same characteristic will share
a single configuration entry of the relevant type.
The value 0 implies no entry in other related MIBs."
::= { pwTDMEntry 4 }
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pwTDMConfigError OBJECT-TYPE
SYNTAX BITS {
notApplicable ( 0),
tdmTypeIncompatible ( 1),
peerRtpIncompatible ( 2),
peerPayloadSizeIncompatible ( 3)
}
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Any of the bits are set if the local configuration is
not compatible with the peer configuration as available
from the various parameters options. Setting is done based
on signaling, or else value (0) will be set.
-tdmTypeIncompatible bit is set if the local configuration
is not carrying the same TDM type as the peer configuration.
-peerRtpIncompatible bit is set if the local configuration
is configured to send RTP packets for this PW, and the
remote is not capable of accepting RTP packets.
-peerPayloadSizeIncompatible bit is set if the local
configuration is not carrying the same Payload Size as the
peer configuration."
::= { pwTDMEntry 5}
pwTDMTimeElapsed OBJECT-TYPE
SYNTAX Integer32 (1..900)
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of seconds, including partial seconds,
that have elapsed since the beginning of the current
measurement period. If, for some reason, such as an
adjustment in the system's time-of-day clock, the
current interval exceeds the maximum value, the
agent will return the maximum value."
::= { pwTDMEntry 6}
pwTDMValidIntervals OBJECT-TYPE
SYNTAX Integer32 (0..96)
MAX-ACCESS read-only
STATUS current
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DESCRIPTION
"The number of previous 15-minute intervals for which data
was collected.
An agent with TDM capability must be capable of supporting
at least n intervals. The minimum value of n is 4. The
default of n is 32 and the maximum value of n is 96.
The value will be n unless the measurement was (re-)
started within the last (n*15) minutes, in which case,
the value will be the number of complete 15-minute
intervals for which the agent has at least some data.
In certain cases (e.g., in the case where the agent is
a proxy), it is possible that some intervals are unavailable.
In this case, this interval is the maximum interval number
for which data is available."
::= { pwTDMEntry 7}
pwTDMValidDayIntervals OBJECT-TYPE
SYNTAX Integer32 (0..30)
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of previous days for which data
was collected.
An agent with TDM capability must be capable of supporting
at least n intervals. The minimum value of n is 1. The
default of n is 1 and the maximum value of n is 30."
::= { pwTDMEntry 8}
pwTDMLastEsTimeStamp OBJECT-TYPE
SYNTAX TimeStamp
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The value of sysUpTime at the most recent occasion at
which the TDM PW entered the ES or SES state."
::= { pwTDMEntry 11}
-- End of TDM PW table
-- PW Generic TDM PW Configuration Table
pwTDMCfgIndexNext OBJECT-TYPE
SYNTAX Unsigned32
MAX-ACCESS read-only
STATUS current
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DESCRIPTION
"This object contains the value to be used for
pwTDMCfgIndex when creating entries in the
pwTDMCfgTable. The value 0 indicates that no
unassigned entries are available. To obtain the
value of pwTDMCfgIndexNext for a new entry in the
pwTDMCfgTable, the manager issues a management
protocol retrieval operation. The agent will
determine through its local policy when this
index value will be made available for reuse."
::= { pwTDMObjects 2 }
pwTDMCfgTable OBJECT-TYPE
SYNTAX SEQUENCE OF PwTDMCfgEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This table contains a set of parameters that may be
referenced by one or more TDM PWs in pwTDMTable."
::= { pwTDMObjects 3 }
pwTDMCfgEntry OBJECT-TYPE
SYNTAX PwTDMCfgEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"These parameters define the characteristics of a
TDM PW. They are grouped here to ease NMS burden.
Once an entry is created here it may be re-used
by many PWs.
Unless otherwise specified, all objects in this table
MUST NOT be changed after row activation (see [PWMIB])."
INDEX { pwTDMCfgIndex }
::= { pwTDMCfgTable 1 }
PwTDMCfgEntry ::= SEQUENCE {
pwTDMCfgIndex PwTDMCfgIndex,
pwTDMCfgRowStatus RowStatus,
pwTDMCfgPayloadSize Unsigned32,
pwTDMCfgPktReorder TruthValue,
pwTDMCfgRtpHdrUsed TruthValue,
pwTDMCfgJtrBfrDepth Unsigned32,
pwTDMCfgPayloadSuppression INTEGER,
pwTDMCfgConsecPktsInSynch Unsigned32,
pwTDMCfgConsecMissPktsOutSynch Unsigned32,
Nicklass Standards Track [Page 16]RFC 5604 Manage TDM over PSN July 2009
pwTDMCfgSetUp2SynchTimeOut Unsigned32,
pwTDMCfgPktReplacePolicy INTEGER,
pwTDMCfgAvePktLossTimeWindow Integer32,
pwTDMCfgExcessivePktLossThreshold Unsigned32,
pwTDMCfgAlarmThreshold Unsigned32,
pwTDMCfgClearAlarmThreshold Unsigned32,
pwTDMCfgMissingPktsToSes Unsigned32,
pwTDMCfgTimestampMode INTEGER,
pwTDMCfgStorageType StorageType,
pwTDMCfgPktFiller Unsigned32,
pwTDMCfgName SnmpAdminString
}
pwTDMCfgIndex OBJECT-TYPE
SYNTAX PwTDMCfgIndex
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"Index to an entry in this table. When an NMS creates
a new entry/row in this table, it best makes use of
the value of the pwTDMCfgIndexNext object in order to
find a free or available index value."
::= { pwTDMCfgEntry 1 }
pwTDMCfgRowStatus OBJECT-TYPE
SYNTAX RowStatus
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"Object used for creating, modifying, and deleting
a row from this table. The following objects cannot be
modified if the entry is in use and the status is active:
pwTDMCfgPayloadSize, pwTDMCfgRtpHdrUsed,
pwTDMCfgJtrBfrDepth, and pwTDMCfgPayloadSuppression.
The row cannot be deleted if the entry is in use."
::= { pwTDMCfgEntry 2 }
pwTDMCfgPayloadSize OBJECT-TYPE
SYNTAX Unsigned32
MAX-ACCESS read-create
STATUS current
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DESCRIPTION
"The value of this object indicates the PayLoad Size (in bytes)
to be defined during the PW setUp. Upon TX, implementation
must be capable of carrying that amount of bytes.
Upon RX, when the Low Entry Networking (LEN) field is set
to 0, the payload of packet MUST assume this size, and if
the actual packet size is inconsistent with this length,
the packet MUST be considered to be malformed."
::= { pwTDMCfgEntry 4 }
pwTDMCfgPktReorder OBJECT-TYPE
SYNTAX TruthValue
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"If set to True: as CE-bound packets are queued in the
jitter buffer, out of order packets are re-ordered. The
maximum sequence number differential (i.e., the range in
which re-sequencing can occur) is dependant on the depth
of the jitter buffer. See pwTDMCfgJtrBfrDepth.
NOTE: Some implementations may not support this feature.
The agent should then reject a SET request for true."
::= { pwTDMCfgEntry 5 }
pwTDMCfgRtpHdrUsed OBJECT-TYPE
SYNTAX TruthValue
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"If set to False: an RTP header is not pre-pended to the
TDM packet."
REFERENCE
"SATOP"
DEFVAL { false }
::= { pwTDMCfgEntry 6 }
pwTDMCfgJtrBfrDepth OBJECT-TYPE
SYNTAX Unsigned32
UNITS "microsecond"
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The size of this buffer SHOULD be locally
configured to allow accommodation to the PSN-specific packet
delay variation.
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If configured to a value not supported by the
implementation, the agent MUST return an error code
'jtrBfrDepth' in 'pwTDMConfigError'.
NOTE: jitter buffers are a limited resource to
be managed. The actual size should be at least twice as big
as the value of pwTDMCfgJtrBfrDepth."
DEFVAL { 3000 }
::= { pwTDMCfgEntry 7 }
pwTDMCfgPayloadSuppression OBJECT-TYPE
SYNTAX INTEGER
{
enable ( 1),
disable ( 2)
}
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"Selecting 'enable' means: Payload suppression is allowed.
Payload MAY be omitted in order to conserve bandwidth.
Selecting 'disable' means: No suppression under any
condition.
Object MAY be changed at any time."
DEFVAL { disable }
::= { pwTDMCfgEntry 8 }
pwTDMCfgConsecPktsInSynch OBJECT-TYPE
SYNTAX Unsigned32 (1..10)
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The number of consecutive packets with sequential
sequence numbers that are required to exit the
LOPS.
Object MAY be changed only when the related PW is
defined as not active."
REFERENCE
"SATOP"
DEFVAL { 2 }
::= { pwTDMCfgEntry 9 }
pwTDMCfgConsecMissPktsOutSynch OBJECT-TYPE
SYNTAX Unsigned32 (1..15)
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The number of consecutive missing packets that are
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required to enter the LOPS.
Object MAY be changed only when the related PW is
defined as not active."
REFERENCE
"SATOP"
DEFVAL { 10 }
::= { pwTDMCfgEntry 10 }
pwTDMCfgSetUp2SynchTimeOut OBJECT-TYPE
SYNTAX Unsigned32
UNITS "millisecond"
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The amount of time the host should wait before declaring the
pseudowire in a down state, if the number of consecutive
TDM packets that have been received after changing the
administrative status to up and after finalization of
signaling (if supported) between the two PEs is smaller
than pwTDMCfgConsecPktsInSynch. Once the PW has
OperStatus of 'up', this parameter is no longer valid. This
parameter is defined to ensure that the host does not
prematurely inform failure of the PW. In particular, PW
'down' notifications should not be sent before expiration
of this timer. This parameter is valid only after
administrative changes of the status of the PW. If the PW
fails due to network impairments, a 'down' notification
should be sent.
Object MAY be changed only when the related PW is
defined as not active."
DEFVAL {5000}
::= { pwTDMCfgEntry 11 }
pwTDMCfgPktReplacePolicy OBJECT-TYPE
SYNTAX INTEGER
{
allOnes (1),
implementationSpecific(2),
filler (3) --user defined
}
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This parameter determines the value to be played when CE bound
packets over/underflow the jitter buffer, or are missing
for any reason. This byte pattern is sent (played) on
the TDM line. Selecting implementationSpecific(2) implies an
agent-specific algorithm. Selecting filler(3) requires
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the setting of pwTDMCfgPktFiller.
Object MAY be changed only when the related PW is
defined as not active."
DEFVAL { allOnes } -- Play AIS
::= { pwTDMCfgEntry 12 }
pwTDMCfgAvePktLossTimeWindow OBJECT-TYPE
SYNTAX Integer32
UNITS "millisecond"
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"The length of time over which the average packet
loss rate should be computed to detect excessive packet
loss rate.
Object MAY be changed only when the related PW is
defined as not active."
::= { pwTDMCfgEntry 13}
pwTDMCfgExcessivePktLossThreshold OBJECT-TYPE
SYNTAX Unsigned32
UNITS "Percent"
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"Excessive packet loss rate is detected by computing the
average packet-loss rate over a pwTDMCfgAvePktLossTimeWindow
amount of time and comparing it with this threshold value.
The rate is expressed in percentage.
Object MAY be changed only when the related PW is
defined as not active."
::= { pwTDMCfgEntry 14 }
pwTDMCfgAlarmThreshold OBJECT-TYPE
SYNTAX Unsigned32
UNITS "milisec"
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"Alarms are only reported when the defect state persists
for the length of time specified by this object.
Object MAY be changed only when the related PW is
defined as not active."
DEFVAL { 2500 }
::= { pwTDMCfgEntry 15 }
pwTDMCfgClearAlarmThreshold OBJECT-TYPE
SYNTAX Unsigned32
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UNITS "milisec"
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"Alarm MUST be cleared after the corresponding defect is
undetected for the amount of time specified by this object.
Object MAY be changed only when the related PW is
defined as not active."
DEFVAL { 10000 }
::= { pwTDMCfgEntry 16 }
pwTDMCfgMissingPktsToSes OBJECT-TYPE
SYNTAX Unsigned32
UNITS "Percent"
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"Percent of missing packets detected (consecutive or not)
within a 1-second window to cause a Severely Error
Second (SES) to be counted.
Object MAY be changed only when the related PW is
defined as not active."
DEFVAL { 30 }
::= { pwTDMCfgEntry 17 }
pwTDMCfgTimestampMode OBJECT-TYPE
SYNTAX INTEGER
{
notApplicable (1),
absolute (2),
differential (3)
}
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"Timestamp generation MAY be used in one of the following
modes:
1. Absolute mode: The PSN-bound IWF sets timestamps
using the clock recovered from the incoming TDM attachment
circuit. As a consequence, the timestamps are closely
correlated with the sequence numbers. All TDM
implementations that support usage of the RTP header MUST
support this mode.
2. Differential mode: Both IWFs have access to a common high-
quality timing source, and this source is used for timestamp
generation. Support of this mode is OPTIONAL.
Object MAY be changed only when the related PW is
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defined as not active."
::= { pwTDMCfgEntry 18 }
pwTDMCfgStorageType OBJECT-TYPE
SYNTAX StorageType
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This variable indicates the storage type for this
row. Conceptual rows having the value permanent(4) must
allow write-access to all columnar objects."
::= { pwTDMCfgEntry 19 }
pwTDMCfgPktFiller OBJECT-TYPE
SYNTAX Unsigned32 (0..255)
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"Filler byte pattern played out on the TDM
interface if pwTDMCfgPktReplacePolicy
was set to filler(3).
Object MAY be changed only when the related PW is
defined as not active."
DEFVAL
{ 255 } -- Play all ones, equal to AIS indications.
::= { pwTDMCfgEntry 20 }
pwTDMCfgName OBJECT-TYPE
SYNTAX SnmpAdminString
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"A descriptive string, preferably a unique name, to an entry
in this table.
Object MAY be changed at any time."
::= { pwTDMCfgEntry 21 }
-- End of Table
-- The following counters work together to integrate
-- errors and the lack of errors on the TDM PW. An error is
-- caused by a missing packet. A missing packet can be a result
-- of: packet loss in the network, (uncorrectable) packet out
-- of sequence, packet length error, jitter buffer overflow,
-- and jitter buffer underflow. The result is declaring whether
-- or not the TDM PW is in Loss of Packet State (LOPS).
-- TDM PW Performance Current Table
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pwTDMPerfCurrentTable OBJECT-TYPE
SYNTAX SEQUENCE OF PwTDMPerfCurrentEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The current 15-minute interval counts are in
this table.
This table provides per TDM PW performance information."
::= { pwTDMObjects 5 }
pwTDMPerfCurrentEntry OBJECT-TYPE
SYNTAX PwTDMPerfCurrentEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"An entry in this table is created by the agent for every
pwTDMTable entry. After 15 minutes, the contents of this
table entry are copied to a new entry in the
pwTDMPerfInterval table, and the counts in this entry
are reset to zero."
INDEX { pwIndex }
::= { pwTDMPerfCurrentTable 1 }
PwTDMPerfCurrentEntry ::= SEQUENCE {
pwTDMPerfCurrentMissingPkts PerfCurrentCount,
pwTDMPerfCurrentPktsReOrder PerfCurrentCount,
pwTDMPerfCurrentJtrBfrUnderruns PerfCurrentCount,
pwTDMPerfCurrentMisOrderDropped PerfCurrentCount,
pwTDMPerfCurrentMalformedPkt PerfCurrentCount,
pwTDMPerfCurrentESs PerfCurrentCount,
pwTDMPerfCurrentSESs PerfCurrentCount,
pwTDMPerfCurrentUASs PerfCurrentCount,
pwTDMPerfCurrentFC PerfCurrentCount
}
pwTDMPerfCurrentMissingPkts OBJECT-TYPE
SYNTAX PerfCurrentCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Number of missing packets (as detected via control word
sequence number gaps)."
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::= { pwTDMPerfCurrentEntry 1 }
pwTDMPerfCurrentPktsReOrder OBJECT-TYPE
SYNTAX PerfCurrentCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Number of packets detected out of sequence (via control
word sequence number) but successfully re-ordered.
Note: some implementations may not support this feature."
::= { pwTDMPerfCurrentEntry 2 }
pwTDMPerfCurrentJtrBfrUnderruns OBJECT-TYPE
SYNTAX PerfCurrentCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Number of times a packet needed to be played
out and the jitter buffer was empty."
::= { pwTDMPerfCurrentEntry 3 }
pwTDMPerfCurrentMisOrderDropped OBJECT-TYPE
SYNTAX PerfCurrentCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Number of packets detected out of order (via control word
sequence numbers) that could not be re-ordered or could
not fit in the jitter buffer."
::= { pwTDMPerfCurrentEntry 4 }
pwTDMPerfCurrentMalformedPkt OBJECT-TYPE
SYNTAX PerfCurrentCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Number of packets detected with unexpected size or
bad headers' stack."
::= { pwTDMPerfCurrentEntry 5 }
pwTDMPerfCurrentESs OBJECT-TYPE
SYNTAX PerfCurrentCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The counter associated with the number of Error
Seconds encountered. Any malformed packet, sequence error,
LOPS, and the like are considered as Error Seconds."
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::= { pwTDMPerfCurrentEntry 6 }
pwTDMPerfCurrentSESs OBJECT-TYPE
SYNTAX PerfCurrentCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The counter associated with the number of
Severely Error Seconds encountered."
::= { pwTDMPerfCurrentEntry 7 }
pwTDMPerfCurrentUASs OBJECT-TYPE
SYNTAX PerfCurrentCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The counter associated with the number of
Unavailable Seconds encountered. Any consecutive
ten seconds of SES are counted as one Unavailable
Seconds (UAS)."
::= { pwTDMPerfCurrentEntry 8 }
pwTDMPerfCurrentFC OBJECT-TYPE
SYNTAX PerfCurrentCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"TDM Failure Counts (FC-TDM). The number of TDM failure
events. A failure event begins when the LOPS failure
is declared, and it ends when the failure is cleared. A
failure event that begins in one period and ends in
another period is counted only in the period in which
it begins."
::= { pwTDMPerfCurrentEntry 9 }
-- End TDM PW Performance Current Interval Table
-- TDM PW Performance Interval Table
pwTDMPerfIntervalTable OBJECT-TYPE
SYNTAX SEQUENCE OF PwTDMPerfIntervalEntry
MAX-ACCESS not-accessible
STATUS current
Nicklass Standards Track [Page 26]RFC 5604 Manage TDM over PSN July 2009
DESCRIPTION
"This table provides performance information per TDM PW
similar to the pwTDMPerfCurrentTable above. However,
these counts represent historical 15-minute intervals.
Typically, this table will have a maximum of 96 entries
for a 24 hour period, but is not limited to this."
::= { pwTDMObjects 6 }
pwTDMPerfIntervalEntry OBJECT-TYPE
SYNTAX PwTDMPerfIntervalEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"An entry in this table is created by the agent for
every pwTDMPerfCurrentEntry that is 15 minutes old.
The contents of the Current entry are copied to the new
entry here. The Current entry then resets its counts
to zero for the next current 15-minute interval."
INDEX { pwIndex, pwTDMPerfIntervalNumber }
::= { pwTDMPerfIntervalTable 1 }
PwTDMPerfIntervalEntry ::= SEQUENCE {
pwTDMPerfIntervalNumber Unsigned32,
pwTDMPerfIntervalValidData TruthValue,
pwTDMPerfIntervalDuration Unsigned32,
pwTDMPerfIntervalMissingPkts PerfIntervalCount,
pwTDMPerfIntervalPktsReOrder PerfIntervalCount,
pwTDMPerfIntervalJtrBfrUnderruns PerfIntervalCount,
pwTDMPerfIntervalMisOrderDropped PerfIntervalCount,
pwTDMPerfIntervalMalformedPkt PerfIntervalCount,
pwTDMPerfIntervalESs PerfIntervalCount,
pwTDMPerfIntervalSESs PerfIntervalCount,
pwTDMPerfIntervalUASs PerfIntervalCount,
pwTDMPerfIntervalFC PerfIntervalCount
}
pwTDMPerfIntervalNumber OBJECT-TYPE
SYNTAX Unsigned32 (1..96)
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"A number (normally between 1 and 96 to cover a 24 hour
period) that identifies the interval for which the set
of statistics is available. The interval identified by 1
Nicklass Standards Track [Page 27]RFC 5604 Manage TDM over PSN July 2009
is the most recently completed 15-minute interval, and
the interval identified by N is the interval immediately
preceding the one identified by N-1. The minimum range of
N is 1 through 4. The default range is 1 through 32. The
maximum value of N is 1 through 96."
::= { pwTDMPerfIntervalEntry 1 }
pwTDMPerfIntervalValidData OBJECT-TYPE
SYNTAX TruthValue
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This variable indicates if the data for this interval
is valid."
::= { pwTDMPerfIntervalEntry 2 }
pwTDMPerfIntervalDuration OBJECT-TYPE
SYNTAX Unsigned32
UNITS "seconds"
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The duration of a particular interval in seconds.
Adjustments in the system's time-of-day clock may
cause the interval to be greater or less than the
normal value. Therefore, this actual interval value
is provided."
::= { pwTDMPerfIntervalEntry 3 }
pwTDMPerfIntervalMissingPkts OBJECT-TYPE
SYNTAX PerfIntervalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Number of missing packets (as detected via control
word sequence number gaps)."
::= { pwTDMPerfIntervalEntry 4 }
pwTDMPerfIntervalPktsReOrder OBJECT-TYPE
SYNTAX PerfIntervalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Number of packets detected out of sequence (via control
word sequence number) but successfully re-ordered.
Note: some implementations may not support this
feature."
::= { pwTDMPerfIntervalEntry 5 }
Nicklass Standards Track [Page 28]RFC 5604 Manage TDM over PSN July 2009
pwTDMPerfIntervalJtrBfrUnderruns OBJECT-TYPE
SYNTAX PerfIntervalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Number of times a packet needed to be played
out and the jitter buffer was empty."
::= { pwTDMPerfIntervalEntry 6 }
pwTDMPerfIntervalMisOrderDropped OBJECT-TYPE
SYNTAX PerfIntervalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Number of packets detected out of order (via control word
sequence numbers) that could not be re-ordered or could
not fit in the jitter buffer."
::= { pwTDMPerfIntervalEntry 7 }
pwTDMPerfIntervalMalformedPkt OBJECT-TYPE
SYNTAX PerfIntervalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Number of packets detected with unexpected size, or
bad headers' stack"
::= { pwTDMPerfIntervalEntry 8 }
pwTDMPerfIntervalESs OBJECT-TYPE
SYNTAX PerfIntervalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The counter associated with the number of Error
Seconds encountered."
::= { pwTDMPerfIntervalEntry 9 }
pwTDMPerfIntervalSESs OBJECT-TYPE
SYNTAX PerfIntervalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The counter associated with the number of
Severely Error Seconds encountered."
::= { pwTDMPerfIntervalEntry 10 }
Nicklass Standards Track [Page 29]RFC 5604 Manage TDM over PSN July 2009
pwTDMPerfIntervalUASs OBJECT-TYPE
SYNTAX PerfIntervalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The counter associated with the number of
Unavailable Seconds encountered."
::= { pwTDMPerfIntervalEntry 11 }
pwTDMPerfIntervalFC OBJECT-TYPE
SYNTAX PerfIntervalCount
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"TDM Failure Counts (FC-TDM). The number of TDM failure
events. A failure event begins when the LOPS failure
is declared, and it ends when the failure is cleared. A
failure event that begins in one period and ends in
another period is counted only in the period in which
it begins."
::= { pwTDMPerfIntervalEntry 12 }
-- End TDM PW Performance Interval Table
-- TDM PW 1day Performance Table
pwTDMPerf1DayIntervalTable OBJECT-TYPE
SYNTAX SEQUENCE OF PwTDMPerf1DayIntervalEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This table provides performance information per TDM PW
similar to the pwTDMPerfIntervalTable above. However,
these counters represent historical one-day intervals up to
one full month. The table consists of real-time data, as
such it is not persistence across re-boot."
::= { pwTDMObjects 7 }
pwTDMPerf1DayIntervalEntry OBJECT-TYPE
SYNTAX PwTDMPerf1DayIntervalEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"An entry is created in this table by the agent
for every entry in the pwTDMTable table."
INDEX { pwIndex,pwTDMPerf1DayIntervalNumber }
Nicklass Standards Track [Page 30]RFC 5604 Manage TDM over PSN July 2009
::= { pwTDMPerf1DayIntervalTable 1 }
PwTDMPerf1DayIntervalEntry ::= SEQUENCE {
pwTDMPerf1DayIntervalNumber Unsigned32,
pwTDMPerf1DayIntervalValidData TruthValue,
pwTDMPerf1DayIntervalDuration Unsigned32,
pwTDMPerf1DayIntervalMissingPkts Counter32,
pwTDMPerf1DayIntervalPktsReOrder Counter32,
pwTDMPerf1DayIntervalJtrBfrUnderruns Counter32,
pwTDMPerf1DayIntervalMisOrderDropped Counter32,
pwTDMPerf1DayIntervalMalformedPkt Counter32,
pwTDMPerf1DayIntervalESs Counter32,
pwTDMPerf1DayIntervalSESs Counter32,
pwTDMPerf1DayIntervalUASs Counter32,
pwTDMPerf1DayIntervalFC Counter32
}
pwTDMPerf1DayIntervalNumber OBJECT-TYPE
SYNTAX Unsigned32 (1..30)
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The number of intervals where 1 indicates the current day
measured period and 2 and above indicate previous days,
respectively."
::= { pwTDMPerf1DayIntervalEntry 1 }
pwTDMPerf1DayIntervalValidData OBJECT-TYPE
SYNTAX TruthValue
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This variable indicates if the data for this interval
is valid."
::= { pwTDMPerf1DayIntervalEntry 2 }
pwTDMPerf1DayIntervalDuration OBJECT-TYPE
SYNTAX Unsigned32
UNITS "seconds"
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The duration of a particular interval in seconds.
Adjustments in the system's time-of-day clock may
cause the interval to be greater or less than the
normal value. Therefore, this actual interval value
is provided."
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::= { pwTDMPerf1DayIntervalEntry 3 }
pwTDMPerf1DayIntervalMissingPkts OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Number of missing packets (as detected via control word
sequence number gaps)."
::= { pwTDMPerf1DayIntervalEntry 4 }
pwTDMPerf1DayIntervalPktsReOrder OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Number of packets detected out of sequence (via control
word sequence number) but successfully re-ordered.
Note: some implementations may not support this
feature."
::= { pwTDMPerf1DayIntervalEntry 5 }
pwTDMPerf1DayIntervalJtrBfrUnderruns OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Number of times a packet needed to be played
out and the jitter buffer was empty."
::= { pwTDMPerf1DayIntervalEntry 6 }
pwTDMPerf1DayIntervalMisOrderDropped OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Number of packets detected out of order (via control word
sequence numbers) that could not be re-ordered or could
not fit in the jitter buffer."
::= { pwTDMPerf1DayIntervalEntry 7 }
pwTDMPerf1DayIntervalMalformedPkt OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Number of packets detected with unexpected size or
bad headers' stack."
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::= { pwTDMPerf1DayIntervalEntry 8 }
pwTDMPerf1DayIntervalESs OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The counter associated with the number of Error
Seconds encountered."
::= { pwTDMPerf1DayIntervalEntry 9 }
pwTDMPerf1DayIntervalSESs OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The counter associated with the number of Severely
Error Seconds."
::= { pwTDMPerf1DayIntervalEntry 10 }
pwTDMPerf1DayIntervalUASs OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The counter associated with the number of
UnAvailable Seconds.
NOTE: When first entering the UAS state, the number
of SES to UAS is added to this object, then as each
additional UAS occurs, this object increments by one."
::= { pwTDMPerf1DayIntervalEntry 11 }
pwTDMPerf1DayIntervalFC OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"TDM Failure Counts (FC-TDM). The number of TDM failure
events. A failure event begins when the LOPS failure
is declared, and it ends when the failure is cleared."
::= { pwTDMPerf1DayIntervalEntry 12 }
-- End of PW TDM Performance table
-- Conformance Information
Nicklass Standards Track [Page 33]RFC 5604 Manage TDM over PSN July 2009
pwTDMCompliances OBJECT IDENTIFIER ::= { pwTDMConformance 1 }
pwTDMGroups OBJECT IDENTIFIER ::= { pwTDMConformance 2 }
pwTDMModuleCompliance MODULE-COMPLIANCE
STATUS current
DESCRIPTION
"The compliance statement for agent that support TDM PW
over PSN operation."
MODULE -- this module
MANDATORY-GROUPS { pwTDMGroup,
pwTDMPerfCurrentGroup,
pwTDMPerfIntervalGroup,
pwTDMPerf1DayIntervalGroup
}
OBJECT pwGenTDMCfgIndex
MIN-ACCESS read-only
DESCRIPTION
"The ability to set an index pointer
is not required."
OBJECT pwRelTDMCfgIndex
MIN-ACCESS read-only
DESCRIPTION
"The ability to set an index pointer
is not required."
OBJECT pwTDMCfgPktReorder
MIN-ACCESS read-only
DESCRIPTION
"The ability to set the packet reordering
is not required. If the feature is not
supported, the value set by the agent MUST
be FALSE."
OBJECT pwTDMCfgRtpHdrUsed
MIN-ACCESS read-only
DESCRIPTION
"The ability to set whether or not to use the
RTP header is not required."
OBJECT pwTDMCfgPayloadSuppression
MIN-ACCESS read-only
DESCRIPTION
"The ability to set this object is not
required."
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OBJECT pwTDMCfgPktReplacePolicy
MIN-ACCESS read-only
DESCRIPTION
"The ability to set the replace policy
is not required."
OBJECT pwTDMCfgStorageType
MIN-ACCESS read-only
DESCRIPTION
"The ability to set the storage type is
not required."
OBJECT pwTDMCfgPktFiller
MIN-ACCESS read-only
DESCRIPTION
"The ability to set the filler pattern
is not required."
OBJECT pwTDMCfgName
MIN-ACCESS read-only
DESCRIPTION
"The ability to set an alias
is not required."
::= { pwTDMCompliances 1 }
-- Units of conformance
pwTDMGroup OBJECT-GROUP
OBJECTS {
pwTDMRate,
pwTDMIfIndex,
pwGenTDMCfgIndex,
pwRelTDMCfgIndex,
pwTDMConfigError,
pwTDMTimeElapsed,
pwTDMValidIntervals,
pwTDMValidDayIntervals,
pwTDMLastEsTimeStamp,
pwTDMCfgIndexNext,
pwTDMCfgRowStatus,
pwTDMCfgPayloadSize,
pwTDMCfgPktReorder,
pwTDMCfgRtpHdrUsed,
pwTDMCfgJtrBfrDepth,
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pwTDMCfgPayloadSuppression,
pwTDMCfgConsecPktsInSynch,
pwTDMCfgConsecMissPktsOutSynch,
pwTDMCfgSetUp2SynchTimeOut,
pwTDMCfgPktReplacePolicy,
pwTDMCfgAvePktLossTimeWindow ,
pwTDMCfgExcessivePktLossThreshold,
pwTDMCfgAlarmThreshold ,
pwTDMCfgClearAlarmThreshold,
pwTDMCfgMissingPktsToSes,
pwTDMCfgTimestampMode,
pwTDMCfgStorageType,
pwTDMCfgPktFiller,
pwTDMCfgName
}
STATUS current
DESCRIPTION
"Collection of objects for basic TDM PW config and
status."
::= { pwTDMGroups 1 }
pwTDMPerfCurrentGroup OBJECT-GROUP
OBJECTS {
pwTDMPerfCurrentMissingPkts,
pwTDMPerfCurrentPktsReOrder,
pwTDMPerfCurrentJtrBfrUnderruns,
pwTDMPerfCurrentMisOrderDropped,
pwTDMPerfCurrentMalformedPkt,
pwTDMPerfCurrentESs,
pwTDMPerfCurrentSESs,
pwTDMPerfCurrentUASs,
pwTDMPerfCurrentFC
}
STATUS current
DESCRIPTION
"Collection of current statistics objects for TDM PWs."
::= { pwTDMGroups 2 }
pwTDMPerfIntervalGroup OBJECT-GROUP
OBJECTS {
pwTDMPerfIntervalValidData,
pwTDMPerfIntervalDuration,
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pwTDMPerfIntervalMissingPkts,
pwTDMPerfIntervalPktsReOrder,
pwTDMPerfIntervalJtrBfrUnderruns,
pwTDMPerfIntervalMisOrderDropped,
pwTDMPerfIntervalMalformedPkt,
pwTDMPerfIntervalESs,
pwTDMPerfIntervalSESs,
pwTDMPerfIntervalUASs,
pwTDMPerfIntervalFC
}
STATUS current
DESCRIPTION
"Collection of Interval statistics objects for TDM PWs."
::= { pwTDMGroups 3 }
pwTDMPerf1DayIntervalGroup OBJECT-GROUP
OBJECTS {
pwTDMPerf1DayIntervalValidData,
pwTDMPerf1DayIntervalDuration,
pwTDMPerf1DayIntervalMissingPkts,
pwTDMPerf1DayIntervalPktsReOrder,
pwTDMPerf1DayIntervalJtrBfrUnderruns,
pwTDMPerf1DayIntervalMisOrderDropped,
pwTDMPerf1DayIntervalMalformedPkt,
pwTDMPerf1DayIntervalESs,
pwTDMPerf1DayIntervalSESs,
pwTDMPerf1DayIntervalUASs,
pwTDMPerf1DayIntervalFC
}
STATUS current
DESCRIPTION
"Collection of Daily statistics objects for TDM PWs."
::= { pwTDMGroups 4 }
END
9. Security Considerations
It is clear that this MIB module is potentially useful for monitoring
of TDM PWs. This MIB can also be used for configuration of certain
objects, and anything that can be configured can be incorrectly
configured, with potentially disastrous results.
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There are a number of management objects defined in this MIB module
with a MAX-ACCESS clause of read-write and/or read-create. Such
objects may be considered sensitive or vulnerable in some network
environments. The support for SET operations in a non-secure
environment without proper protection can have a negative effect on
network operations. These are the tables and objects and their
sensitivity/vulnerability:
The pwTDMTable and pwTDMCfgTable contain objects of TDM PW parameters
on a Provider Edge (PE) device. Unauthorized access to objects in
these tables could result in disruption of traffic on the network.
The use of stronger mechanisms such as SNMPv3 security should be
considered where possible. Specifically, SNMPv3 VACM and USM MUST be
used with any SNMPV3 agent, which implements this MIB module.
Administrators should consider whether read access to these objects
should be allowed, since read access may be undesirable under certain
circumstances.
Some of the readable objects in this MIB module (i.e., objects with a
MAX-ACCESS other than not-accessible) may be considered sensitive or
vulnerable in some network environments. It is thus important to
control even GET and/or NOTIFY access to these objects and possibly
to even encrypt the values of these objects when sending them over
the network via SNMP. These are the tables and objects and their
sensitivity/vulnerability:
The pwTDMTable, pwTDMPerfCurrentTable, pwTDMPerfIntervalTable, and
pwTDMPerf1DayIntervalTable collectively show the TDM pseudowire
connectivity topology and its performance characteristics.
If an Administrator does not want to reveal this information, then
these tables should be considered sensitive/vulnerable.
SNMP versions prior to SNMPv3 did not include adequate security.
Even if the network itself is secure (for example by using IPsec),
even then, there is no control as to who on the secure network is
allowed to access and GET/SET (read/change/create/delete) the objects
in this MIB module.
It is RECOMMENDED that implementers consider the security features as
provided by the SNMPv3 framework (see [RFC3410], section 8),
including full support for the SNMPv3 cryptographic mechanisms (for
authentication and privacy).
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RFC 5604 Manage TDM over PSN July 2009
Further, deployment of SNMP versions prior to SNMPv3 is NOT
RECOMMENDED. Instead, it is RECOMMENDED to deploy SNMPv3 and to
enable cryptographic security. It is then a customer/operator
responsibility to ensure that the SNMP entity giving access to an
instance of this MIB module is properly configured to give access to
the objects only to those principals (users) that have legitimate
rights to indeed GET or SET (change/create/delete) them.
10. IANA Considerations
The MIB module in this document uses the following IANA-assigned
OBJECT IDENTIFIER values recorded in the SMI Numbers registry:
Descriptor OBJECT IDENTIFIER value
---------- -----------------------
pwTDMMIB { mib-2 186 }
11. References
11.1. Normative References
[SATOP] Vainshtein, A., Ed., and YJ. Stein, Ed., "Structure-
Agnostic Time Division Multiplexing (TDM) over Packet
(SAToP)", RFC 4553, June 2006.
[TDMCP-EXT] Vainshtein, A. and Y(J). Stein, "Control Protocol
Extensions for the Setup of Time-Division Multiplexing
(TDM) Pseudowires in MPLS Networks", RFC 5287, August
2008.
[PWMIB] Nadeau, T., Ed., and D. Zelig, Ed., "Pseudowire (PW)
Management Information Base", RFC 5601, July 2009.
[PWTC] Nadeau, T., Ed., Zelig, D., Ed., and O. Nicklass, Ed.,
"Definitions for Textual Conventions for Pseudowire (PW)
Management", RFC 5542, May 2009.
[DS1MIB] Nicklass, O., Ed., "Definitions of Managed Objects for
the DS1, J1, E1, DS2, and E2 Interface Types", RFC 4805,
March 2007.
[DS3MIB] Nicklass, O., Ed., "Definitions of Managed Objects for
the DS3/E3 Interface Type", RFC 3896, September 2004.
Nicklass Standards Track [Page 39]RFC 5604 Manage TDM over PSN July 2009
[DS0MIB] Fowler, D., Ed., "Definitions of Managed Objects for the
DS0 and DS0 Bundle Interface Type", RFC 2494, January
1999.
[IFMIB] McCloghrie, K. and F. Kastenholz, "The Interfaces Group
MIB", RFC 2863, June 2000.
[RFC2578] McCloghrie, K., Perkins, D., and J. Schoenwaelder,
"Structure of Management Information Version 2 (SMIv2)",
STD 58, RFC 2578, April 1999.
[RFC2579] McCloghrie, K., Perkins, D., and J. Schoenwaelder,
"Textual Conventions for SMIv2", STD 58, RFC 2579, April
1999.
[RFC2580] McCloghrie, K., Perkins, D., and J. Schoenwaelder,
"Conformance Statements for SMIv2", STD 58, RFC 2580,
April 1999.
[RFC3411] Harrington, D., Presuhn, R., and B. Wijnen, "An
Architecture for Describing Simple Network Management
Protocol (SNMP) Management Frameworks", STD 62, RFC
3411, December 2002.
[BCP14] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
11.2. Informative References
[RFC4197] Riegel, M., Ed., "Requirements for Edge-to-Edge
Emulation of Time Division Multiplexed (TDM) Circuits
over Packet Switching Networks", RFC 4197, October 2005.
[RFC3985] Bryant, S., Ed., and P. Pate, Ed., "Pseudo Wire
Emulation Edge-to-Edge (PWE3) Architecture", RFC 3985,
March 2005.
[TDMOIP] Y(J). Stein, Shashoua, R., Insler, R., and M. Anavi,
"Time Division Multiplexing over IP (TDMoIP)", RFC 5087,
December 2007.
[CESOPSN] Vainshtein A., Sasson, I., Sadovski, A., Metz, E.,
Frost, T., and P. Pate "Structured TDM Circuit Emulation
Service over Packet Switched Network (CESoPSN)", Work in
Progress, October 2003.
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[RFC3410] Case, J., Mundy, R., Partain, D., and B. Stewart,
"Introduction and Applicability Statements for
Internet-Standard Management Framework", RFC 3410,
December 2002.
12. Acknowledgements
This document was produced by the PWE3 Working Group. Special thanks
to Yaakov Stein, Doron Tzur, Sasha Vainshtein, and Ron Cohen for
close review and good suggestions.
Author's Address
Orly Nicklass
RADVISION Ltd.
24 Raul Wallenberg St.
Tel Aviv
ISRAEL
Phone: +972 3 7679444
EMail: orlyn@radvision.com
Nicklass Standards Track [Page 41]
