Internet Draft David Zelig, Ed.
Expires: February 2006 Corrigent Systems
Thomas D. Nadeau, Ed.
Cisco Systems, Inc.
July 2005
Pseudo Wire (PW) over MPLS PSN Management Information Base
draft-ietf-pwe3-pw-mpls-mib-07.txt
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Abstract
This memo defines an experimental portion of the Management
Information Base for use with network management protocols in
the Internet community. In particular, it describes managed
objects for modeling of Pseudo Wires over an MPLS transport
network.
Table of Contents
Abstract.......................................................1
1 Introduction...................................................2
2 Terminology....................................................3
3 The Internet-Standard Management Framework.....................3
4 PWE3 MIB modules Architecture ................................4
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4.1 PW-MPLS-STD-MIB Module Usage .................................4
5 PWE3 MPLS MIB Module Definitions..............................7
6 Security Considerations......................................26
7 References...................................................27
7.1 Normative references.........................................27
7.2 Informative references.......................................29
8 Editors' Addresses...........................................29
9 Contributor's Addresses......................................29
10 Intellectual Property Notice.................................30
11 Full Copyright Statement.....................................29
12 IANA considerations..........................................27
1. Introduction
This memo defines a portion of the Management Information Base
(MIB) for use with network management protocols in the Internet
community. In particular, it defines a MIB module which can be
used to manage pseudo wire (PW) services transmitted over
different types of MPLS packet Switched Network (PSN)
tunnels.
The general PW-STD-MIB module [PWMIB] defines the global parameters
for PWs, regardless of underlying PSN or emulated service type.
This document describes the MIB objects that define pseudo wire
association to the MPLS PSN, in a way that is not specific to the
carried service.
Together, [RFC3814] and [RFC3813], describe the modeling of an MPLS
Tunnel, and a Tunnel's underlying cross-connects. The defined MIB
support MPLS-TE as a PSN, Non-TE MPLS PSN (an outer tunnel created
by The Label Distribution Protocol (LDP) [RFC3036] or manually),
and MPLS PW label only (no outer tunnel).
2. Terminology
This document adopts the definitions, acronyms and mechanisms
described in [RFC3985]. Unless otherwise stated, the mechanisms of
[RFC3985] apply and will not be re-described here.
The terms "Outbound" and "Inbound" in this MIB module are based on
the common practice in the MPLS standards, i.e. "outbound" are
toward the PSN. However, where these terms are used in an object
name, the object description clarifies the exact packet direction
to prevent confusion with these terms in other documents.
"PSN Tunnel" is a general term indicating a virtual connection
between the two PWE3 edge devices. Each tunnel may potentially
carry multiple PWs inside. In the scope of this document, it is
MPLS tunnel.
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This document uses terminology from the document describing the
MPLS architecture [RFC3031] for MPLS PSN. A Label Switched Path
(LSP) is modeled as described in [RFC3813] and [RFC3814] via
a series of cross-connects through 1 or more Label switching
routers (LSR).
In MPLS PSN, a PW connection typically uses a PW Label within a
Tunnel Label [PWCNTRL]. Multiple pseudo wires each with a unique PW
Label can share the same Tunnel. For PW transport over MPLS, the
Tunnel Label is known as the "outer" Label, while the PW Label is
known as the "inner" Label. An exception to this is with adjacent
LSRs or the use of PHP. In this case, there is an option for PWs to
connect directly without an outer Label.
3. 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].
4. PWE3 MIB modules Architecture
The MIB structure for defining a PW service is composed from three
types of MIB modules.
The first type is the PW MIB module, which configures general
parameters of the PW that are common to all types of emulated
services and PSN types.
The second type of modules is PSN type specific module. There is a
different module for each type of PSN. These modules associate the
PW with one or more "tunnels" that carry the service over the PSN.
These modules are defined in other documents.
The third type of modules is service-specific module, which is
emulated signal type dependent. These modules are defined in other
documents.
[PWTC] defines some of the object types used in these modules.
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4.1 PW-MPLS-STD-MIB Module Usage
- The PW table (pwTable) in [PWMIB] is used for all PW types
(ATM, FR, Ethernet, SONET, etc.). This table contains high level
generic parameters related to the PW creation. The operator or the
agent for each PW service creates a row.
- If the PSN type in pwTable is MPLS, the agent creates a row in
the MPLS specific parameters table (pwMplsVcTable) in this module,
which contain MPLS specific parameters such as EXP bits handling
and outer tunnel configuration.
- The operator configures the association to the desired MPLS
tunnel (require for MPLS TE tunnels or manually configured PWs)
through the pwMplsTeOutbaoundTable. For LDP based outer tunnel,
there is no need for manula configuration since there is only a
single tunnel toward the peer.
- The agent creates rows in the MPLS mapping table in order to
allow quick retrieval of information based on the tunnel indexes.
The relation to the MPLS network is by configuration of the edge
LSR only - that is to say, the LSR providing the PW function. Since
Tunnels are uni-directional, a pair of tunnels must exist (one for
inbound, one for outbound). The following graphic depicts a VC that
originates and terminates at LSR-M. It uses LSPs A and B formed by
Tunnels Ax and Bx continuing through LSR-N to LSR-P. The
concatenations of Tunnels create the LSPs. Note: 'X' denotes a
Tunnel's cross-connect.
LSP-A
<- - - - - - - - - - - - - - - - - - - - - - - - - - - -
+---- (edge) LSR-M ---+ +--------- LSR-N ---------+ + LSR-P
|---+ | | | |
| | Tunnel | | Tunnel | |
+ | A1 (M<-N) +----+ +----+ A2 (M<-P) +----+ +----+
| | <------| | | |<--------------| | | |
<-->| N |PWin inSeg |MPLS| |MPLS| outSeg inSeg |MPLS| |MPLS|
N S | | <---X<-----| IF | | IF |<------X<------| IF | | IF |
A E | S | | |<-->| | | |<-->| | |
T R | | --->X----->| | | |------>X------>| | | |
I V | P |PWout outSeg| | | | inSeg outSeg | | | |
V I | | ------>| | | |-------------->| | | |
E C + | Tunnel +----+ +----+ Tunnel +----+ +----+
E |---+ B1 (M->N) | | B2 (M->P) | |
| | | | |
+---------------------+ +-------------------------+ +-----
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- - - - - - - - - - - - - - - - - - - - - - - - - - - ->
LSP-B
The PW-MPLS-MIB supports three options for MPLS network:
- In the MPLS-TE case, Tunnel A1 and B1 are created via the MPLS-TE
MIB [RFC3814]. The tunnels are associated to the PW by the (4)
indexes that uniquely identify the Tunnel at the TE-MIB.
- In the Non TE case, Tunnel A1 and B1 are either manually
configured or set up with LDP. The tunnels are associated to the PW
by the XC index in the MPLS-LSR-MIB [RFC3813].
- In the PW label only case, there is no outer tunnel on top of the
PW label. This case is useful in case of adjacent PEs in manual
configuration mode. Note that when LSR-N acts as PHP for the outer
tunnel label, there are still entries for the outer tunnel in the
relevant MPLS MIB modules.
A combination of MPLS-TE outer tunnel(s) and LDP outer tunnel for
the same PW is allowed through the pwMplsOutboundTunnel. The
current tunnel that is used to forward traffic is indicated in the
object pwMplsOutboundTunnelTypeInUse.
The PW MPLS MIB module reports through the inbound table the XC
entry in the LDP-STD_MIB of the PW that were signaled through LDP.
This MIB module assumes that a single PW can be associated to one
MPLS-TE tunnel at a time. This tunnel may be composed of multiple
instances (i.e. LSP), each represented by a separate instance
index. The current active LSP is reported through this MIB module.
It is worth noting that inbound (tunnel originated in the remote
PE) mapping is nor configured nor reported through the PW MPLS MIB
module since the local PE does not know the inbound association
between specific PW and MPLS tunnels.
5. PWE3 MPLS MIB Module Definitions
PW-MPLS-STD-MIB DEFINITIONS ::= BEGIN
IMPORTS
MODULE-IDENTITY, OBJECT-TYPE,
Unsigned32
FROM SNMPv2-SMI -- [RFC2578]
MODULE-COMPLIANCE, OBJECT-GROUP
FROM SNMPv2-CONF -- [RFC2580]
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StorageType
FROM SNMPv2-TC -- [RFC2579]
InterfaceIndexOrZero
FROM IF-MIB -- [RFC2863]
MplsTunnelIndex, MplsTunnelInstanceIndex,
MplsLdpIdentifier, MplsLsrIdentifier
FROM MPLS-TC-STD-MIB -- [RFC3810]
MplsIndexType
FROM MPLS-LSR-STD-MIB -- [RFC3813]
PwIndexType, pwMIB
FROM PW-TC-STD-MIB
pwIndex
FROM PW-STD-MIB
;
pwMplsStdMIB MODULE-IDENTITY
LAST-UPDATED "200507041200Z" -- 4 July 2005 12:00:00 GMT
ORGANIZATION "Pseudo Wire Edge to Edge Emulation (PWE3) Working
Group."
CONTACT-INFO
"
David Zelig, Editor
E-mail: davidz@corrigent.com
Thomas D. Nadeau, Editor
Email: tnadeau@cisco.com
The PWE3 Working Group (email distribution pwe3@ietf.org,
http://www.ietf.org/html.charters/pwe3-charter.html)
"
DESCRIPTION
"This MIB module complements the PW MIB module for PW
operation over MPLS.
Copyright (C) The Internet Society (2005). This version
of this MIB module is part of RFC yyyy; see the RFC
itself for full legal notices.
-- RFC Ed.: replace yyyy with actual RFC number & remove this note
"
-- Revision history.
REVISION
"200507041200Z" -- 4 July 2005 12:00:00 GMT
DESCRIPTION
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" First published as RFCWXYZ. "
-- RFC Editor: Please replace
-- WXYZ with correct #
::= { pwMIB 4 } -- RFC Editor: To be assigned by IANA
-- the value 4 is requested for this
-- specific Module. Please replace XXX
-- with the assigned value.
-- Top-level components of this MIB.
-- Notifications
pwMplsNotifications OBJECT IDENTIFIER
::= { pwMplsStdMIB 0 }
-- Tables, Scalars
pwMplsObjects OBJECT IDENTIFIER
::= { pwMplsStdMIB 1 }
-- Conformance
pwMplsConformance OBJECT IDENTIFIER
::= { pwMplsStdMIB 2 }
-- PW MPLS table
pwMplsTable OBJECT-TYPE
SYNTAX SEQUENCE OF PwMplsEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This table controls MPLS specific parameters when the PW is
going to be carried over MPLS PSN."
::= { pwMplsObjects 1 }
pwMplsEntry OBJECT-TYPE
SYNTAX PwMplsEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"A row in this table represents parameters specific to MPLS
PSN for a pseudo wire (PW). The row is created
automatically by the local agent if the pwPsnType is
MPLS. It is indexed by pwIndex, which uniquely
identifying a singular PW.
"
INDEX { pwIndex }
::= { pwMplsTable 1 }
PwMplsEntry ::= SEQUENCE {
pwMplsMplsType BITS,
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pwMplsExpBitsMode INTEGER,
pwMplsExpBits Unsigned32,
pwMplsTtl Unsigned32,
pwMplsLocalLdpID MplsLdpIdentifier,
pwMplsLocalLdpEntityID MplsLsrIdentifier,
pwMplsPeerLdpID MplsLdpIdentifier,
pwMplsStorageType StorageType
}
pwMplsMplsType OBJECT-TYPE
SYNTAX BITS {
mplsTe (0),
mplsNonTe (1),
vcOnly (2)
}
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"Set by the operator to indicate the outer tunnel types, if
exists. mplsTe(0) is used if the outer tunnel was set-up
by MPLS-TE, and mplsNonTe(1) is used the outer tunnel was
set up by LDP or manually. Combination of mplsTe(0) and
mplsNonTe(1) may exist together.
vcOnly(2) is used if there is no outer tunnel label, i.e.
in static provisioning without MPLS tunnel. vcOnly(2)
cannot be combined with mplsNonTe(1) or mplsTe(0)."
DEFVAL { { mplsNonTe } }
::= { pwMplsEntry 1 }
pwMplsExpBitsMode OBJECT-TYPE
SYNTAX INTEGER {
outerTunnel (1),
specifiedValue (2),
serviceDependant (3)
}
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"Set by the operator to indicate the way the PW shim label
EXP bits are to be determined. The value of outerTunnel(1)
is used where there is an outer tunnel - pwMplsMplsType
is mplsTe(0) or mplsNonTe(1). Note that in this case there
is no need to mark the PW label with the EXP bits since the
PW label is not visible to the intermediate nodes.
If there is no outer tunnel, specifiedValue(2) indicates
that the value is specified by pwMplsExpBits, and
serviceDependant(3) indicates that the EXP bits are setup
based on a rule specified in the emulated service specific
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tables, for example when the EXP bits are a function of
802.1p marking for Ethernet emulated service."
DEFVAL { outerTunnel }
::= { pwMplsEntry 2 }
pwMplsExpBits OBJECT-TYPE
SYNTAX Unsigned32 (0..7)
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"Set by the operator to indicate the MPLS EXP bits to be
used on the PW shim label if pwMplsExpBitsMode is
specifiedValue(2), zero otherwise."
DEFVAL { 0 }
::= { pwMplsEntry 3 }
pwMplsTtl OBJECT-TYPE
SYNTAX Unsigned32 (0..255)
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"Set by the operator to indicate the PW TTL value to be
used on the PW shim label."
DEFVAL { 2 }
::= { pwMplsEntry 4 }
pwMplsLocalLdpID OBJECT-TYPE
SYNTAX MplsLdpIdentifier
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"The local LDP identifier of the LDP entity creating
this PW in the local node. As the PW labels are always
set from the per platform label space, the last two octets
in the LDP ID MUST be always both zeros."
REFERENCE
"'LDP specifications', RFC 3036 section 2.2.2."
::= { pwMplsEntry 5 }
pwMplsLocalLdpEntityID OBJECT-TYPE
SYNTAX MplsLsrIdentifier
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"The local node LDP Entity ID of the LDP entity creating
this PW. Should return the value of all zeros if not
used."
::= { pwMplsEntry 6 }
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pwMplsPeerLdpID OBJECT-TYPE
SYNTAX MplsLdpIdentifier
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The peer LDP identifier as identified from the LDP
session. Should return the value of zero if not applicable
or not known yet."
::= { pwMplsEntry 7 }
pwMplsStorageType OBJECT-TYPE
SYNTAX StorageType
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"This variable indicates the storage type for this row."
::= { pwMplsEntry 8 }
-- End of PW MPLS table
-- Pseudo Wire MPLS Outbound Tunnel table
pwMplsOutboundTable OBJECT-TYPE
SYNTAX SEQUENCE OF PwMplsOutboundEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This table reports and configure the current outbound MPLS
tunnels (i.e. toward the PSN) or the physical interface in
case of PW label only that carry the PW traffic. It also
reports the current outer tunnel and LSP which forward the
PW traffic."
::= { pwMplsObjects 2 }
pwMplsOutboundEntry OBJECT-TYPE
SYNTAX PwMplsOutboundEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"A row in this table configured the outer tunnel used for
carrying the PW traffic toward the PSN.
In the case of PW label only, it configures the interface
that will carry the PW traffic.
An entry in this table augments the pwMplsEntry, and is
created automatically when the corresponding row has been
created by the agent in the pwMplsEntry.
This table points to the appropriate MPLS MIB module.
In the MPLS-TE case, the 3 variables relevant to the
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indexing of a TE tunnel head-end are used as in
MPLS-TE-STD-MIB are to be configured, and the tunnel
instance indicates the LSP that is currently in use for
forwarding the traffic.
In case of signaled Non-TE MPLS (an outer tunnel label
assigned by LDP) the table points to the XC entry in the
LSR-STD-MIB. If the Non-TE MPLS tunnel is manually
configured, the operator configure the XC pointer to this
tunnel.
In case of PW label only (no outer tunnel) the ifIndex of
the port to carry the PW is configured here.
It is possible to associate a PW to one TE tunnel head-end
and a non-TE tunnel together. An indication in this table
will report the currently active one, In addition, in the
TE case the table reports the active tunnel instance
(i.e. the specific LSP in use).
"
AUGMENTS { pwMplsEntry }
::= { pwMplsOutboundTable 1 }
PwMplsOutboundEntry ::= SEQUENCE {
pwMplsOutboundLsrXcIndex MplsIndexType,
pwMplsOutboundTunnelIndex MplsTunnelIndex,
pwMplsOutboundTunnelInstance MplsTunnelInstanceIndex,
pwMplsOutboundTunnelLclLSR MplsLsrIdentifier,
pwMplsOutboundTunnelPeerLSR MplsLsrIdentifier,
pwMplsOutboundIfIndex InterfaceIndexOrZero,
pwMplsOutboundTunnelTypeInUse INTEGER
}
pwMplsOutboundLsrXcIndex OBJECT-TYPE
SYNTAX MplsIndexType
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"This object is applicable if pwMplsMplsType mplsNonTe(1)
bit is set, and MUST return a value of zero otherwise.
If the outer tunnel is signaled, the object is read-only
and indicate the XC index in the MPLS-LSR-STD-MIB of the
outer tunnel toward the peer. Otherwise (tunnel is set-up
manually) the operator define the XC index of the manually
created outer tunnel through this object.
"
::= { pwMplsOutboundEntry 1 }
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pwMplsOutboundTunnelIndex OBJECT-TYPE
SYNTAX MplsTunnelIndex
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"This object is applicable if pwMplsMplsType mplsTe(0)
bit is set, and MUST return a value of zero otherwise.
It is Part of set of indexes for outbound tunnel.
The operator set this object to represent the desired
tunnel head-end toward the peer for carrying the PW
traffic.
"
::= { pwMplsOutboundEntry 2 }
pwMplsOutboundTunnelInstance OBJECT-TYPE
SYNTAX MplsTunnelInstanceIndex
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This object is applicable if pwMplsMplsType mplsTe(0)
bit is set, and MUST return a value of zero otherwise.
It indicates the actual tunnel instance that is currently
active and carrying the PW traffic - it should return the
value of zero until if the information from the MPLS-TE
application is not yet known.
"
::= { pwMplsOutboundEntry 3 }
pwMplsOutboundTunnelLclLSR OBJECT-TYPE
SYNTAX MplsLsrIdentifier
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"This object is applicable if pwMplsMplsType mplsTe(0)
bit is set, and MUST return a value of all zeros otherwise.
It is part of set of indexes for outbound tunnel.
The operator set this object to represent the desired
tunnel head-end toward the peer for carrying the PW
traffic.
"
::= { pwMplsOutboundEntry 4 }
pwMplsOutboundTunnelPeerLSR OBJECT-TYPE
SYNTAX MplsLsrIdentifier
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"This object is applicable if pwMplsMplsType mplsTe(0)
bit is set, and MUST return a value of zero otherwise.
It is part of set of indexes for outbound tunnel. It is
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typically equal to pwPeerAddr.
"
::= { pwMplsOutboundEntry 5 }
pwMplsOutboundIfIndex OBJECT-TYPE
SYNTAX InterfaceIndexOrZero
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"This object is applicable if pwMplsMplsType mplsTe(0)
bit is set, and MUST return a value of zero otherwise.
The operator configure the ifIndex of the outbound port
in this case.
"
::= { pwMplsOutboundEntry 6 }
pwMplsOutboundTunnelTypeInUse OBJECT-TYPE
SYNTAX INTEGER {
notYetKnown (1),
mplsTe (2),
mplsNonTe (3),
vcOnly (4)
}
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This object indicates the current tunnel that is carrying
the PW traffic.
The value of notYetKnown(1) should be used if the agent is
currently unable to determine which tunnel or interface is
carrying the PW, for example because both tunnels are in
operational status down.
"
::= { pwMplsOutboundEntry 7 }
-- End of PW MPLS Outbound Tunnel table
-- PW MPLS inbound table
pwMplsInboundTable OBJECT-TYPE
SYNTAX SEQUENCE OF PwMplsInboundEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This table indicates the PW LDP XC entry in the
MPLS-LSR-STD-MIB for signaled PWs.
"
::= { pwMplsObjects 3 }
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pwMplsInboundEntry OBJECT-TYPE
SYNTAX PwMplsInboundEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"A row in this table is created by the agent
for each signaled PW, and shows the XC index related to
the PW signaling in the inbound direction in the
MPLS-LSR-STD-MIB that controls and display the information
for all the LDP signaling processes in the local node.
"
INDEX { pwIndex }
::= { pwMplsInboundTable 1 }
PwMplsInboundEntry ::= SEQUENCE {
pwMplsInboundXcIndex MplsIndexType
}
pwMplsInboundXcIndex OBJECT-TYPE
SYNTAX MplsIndexType
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The XC index representing this PW in the inbound
direction. Should return the value of zero if the
information is not yet known."
::= { pwMplsInboundEntry 1 }
-- End of PW MPLS inbound table
-- PW to Non-TE mapping Table.
pwMplsNonTeMappingTable OBJECT-TYPE
SYNTAX SEQUENCE OF PwMplsNonTeMappingEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This table indicates outbound Tunnel to a PW in non-TE
applications, maps the PW to it's (inbound) XC entry, and
indicates the PW to physical interface mapping for a PW
label to physical interface a PW label is in use without
outer tunnel.
"
::= { pwMplsObjects 4 }
pwMplsNonTeMappingEntry OBJECT-TYPE
SYNTAX PwMplsNonTeMappingEntry
MAX-ACCESS not-accessible
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STATUS current
DESCRIPTION
"A row in this table displays the association
between the PW and
- it's non-TE MPLS outbound outer Tunnel or,
- it's XC entry in the MPLS-LSR-STD-MIB,
- it's physical interface if there is no outer tunnel
(PW label only) and manual configuration.
Rows are created in this table by the by the
agent depending on the setting of pwMplsMplsType:
- If pwMplsMplsType mplsNonTe(1) bit is set, the agent
creates a row for the outbound direction
(pwMplsNonTeMappingDirection set to psnBound(1)).
The pwMplsNonTeMappingXcIndex holds the XC index in the
MPLS-LSR-STD-MIB of the PSN bound outer tunnel.
pwMplsNonTeMappingIfIndex MUST be zero for this row.
- If pwMplsMplsType vcOnly(2) bit is set, the agent
creates a row for the outbound direction
(pwMplsNonTeMappingDirection set to psnBound(1)).
The pwMplsNonTeMappingIfIndex holds the ifIndex of the
physical port this PW will use in the outbound direction.
pwMplsNonTeMappingXcIndex MUST be zero for this row.
- If the PW has been set-up by signaling protocol (i.e.
pwOwner equal pwIdFecSignaling(2) or
genFecSignaling(3)), the agent creates a row for the
inbound direction (pwMplsNonTeMappingDirection set to
fromPsn(2)).
The pwMplsNonTeMappingXcIndex holds the XC index in the
MPLS-LSR-STD-MIB of the PW LDP generated XC entry.
pwMplsNonTeMappingIfIndex MUST be zero for this row.
An application can use this table to quickly retrieve the
PW carried over specific non-TE MPLS outer tunnel or
physical interface.
"
INDEX { pwMplsNonTeMappingDirection,
pwMplsNonTeMappingXcIndex,
pwMplsNonTeMappingIfIndex,
pwMplsNonTeMappingVcIndex }
::= { pwMplsNonTeMappingTable 1 }
PwMplsNonTeMappingEntry ::= SEQUENCE {
pwMplsNonTeMappingDirection INTEGER,
pwMplsNonTeMappingXcIndex MplsIndexType,
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pwMplsNonTeMappingIfIndex InterfaceIndexOrZero,
pwMplsNonTeMappingVcIndex PwIndexType
}
pwMplsNonTeMappingDirection OBJECT-TYPE
SYNTAX INTEGER {
psnBound (1),
fromPsn (2)
}
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"Index for the conceptual XC row identifying Tunnel to PW
mappings, indicating the direction of packet flow the entry
is related too.
psnBound(1) indicates that the entry is related to
packets toward the PSN.
fromPsn(2) indicates that the entry is related to
packets coming from the PSN.
"
::= { pwMplsNonTeMappingEntry 1 }
pwMplsNonTeMappingXcIndex OBJECT-TYPE
SYNTAX MplsIndexType
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"See the description clause of pwMplsNonTeMappingEntry for
the usage guidelines of this object."
::= { pwMplsNonTeMappingEntry 2 }
pwMplsNonTeMappingIfIndex OBJECT-TYPE
SYNTAX InterfaceIndexOrZero
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"See the description clause of pwMplsNonTeMappingEntry for
the usage guidelines of this object."
::= { pwMplsNonTeMappingEntry 3 }
pwMplsNonTeMappingVcIndex OBJECT-TYPE
SYNTAX PwIndexType
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The value that represent the PW in the pwTable."
::= { pwMplsNonTeMappingEntry 4 }
-- End of PW to Non-TE mapping Table.
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-- PW to TE MPLS tunnels mapping Table.
pwMplsTeMappingTable OBJECT-TYPE
SYNTAX SEQUENCE OF PwMplsTeMappingEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This table enable the retrieval of a PW association to the
outbound MPLS tunnel for MPLS-TE applications."
::= { pwMplsObjects 5 }
pwMplsTeMappingEntry OBJECT-TYPE
SYNTAX PwMplsTeMappingEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"A row in this table represents the association
between a PW and it's MPLS-TE outer (head-end) Tunnel.
An application can use this table to quickly retrieve the
list of the PWs that are configured on a specific MPLS TE
outer tunnel.
The pwMplsTeMappingTunnelInstance reports the actual
LSP out of the tunnel head-end that is currently
forwarding the traffic.
The table in indexed by the head-end indexes of a TE
tunnel and the PW index.
"
INDEX { pwMplsTeMappingTunnelIndex,
pwMplsTeMappingTunnelInstance,
pwMplsTeMappingTunnelPeerLsrID,
pwMplsTeMappingTunnelLocalLsrID,
pwMplsTeMappingVcIndex }
::= { pwMplsTeMappingTable 1 }
PwMplsTeMappingEntry ::= SEQUENCE {
pwMplsTeMappingTunnelIndex MplsTunnelIndex,
pwMplsTeMappingTunnelInstance MplsTunnelInstanceIndex,
pwMplsTeMappingTunnelPeerLsrID MplsLsrIdentifier,
pwMplsTeMappingTunnelLocalLsrID MplsLsrIdentifier,
pwMplsTeMappingVcIndex PwIndexType
}
pwMplsTeMappingTunnelIndex OBJECT-TYPE
SYNTAX MplsTunnelIndex
MAX-ACCESS not-accessible
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STATUS current
DESCRIPTION
"Primary index for the conceptual row identifying the
MPLS-TE tunnel that is carrying the PW traffic."
::= { pwMplsTeMappingEntry 1 }
pwMplsTeMappingTunnelInstance OBJECT-TYPE
SYNTAX MplsTunnelInstanceIndex
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This object identify the MPLS-TE LSP that is carrying the
PW traffic. Should return the value of zero if the
information of the specific LSP is not yet known.
Note that based on the recommendation in the
MPLS-TC-STD-MIB, instance index 0 should refer to the
configured tunnel interface."
::= { pwMplsTeMappingEntry 2 }
pwMplsTeMappingTunnelPeerLsrID OBJECT-TYPE
SYNTAX MplsLsrIdentifier
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"Identifies the Peer LSR when the outer tunnel is MPLS-TE
based."
::= { pwMplsTeMappingEntry 3 }
pwMplsTeMappingTunnelLocalLsrID OBJECT-TYPE
SYNTAX MplsLsrIdentifier
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"Identifies the local LSR."
::= { pwMplsTeMappingEntry 4 }
pwMplsTeMappingVcIndex OBJECT-TYPE
SYNTAX PwIndexType
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The value that represent the PW in the pwTable."
::= { pwMplsTeMappingEntry 5 }
-- End of PW to TE MPLS tunnels mapping Table.
-- conformance information
pwMplsGroups OBJECT IDENTIFIER ::= { pwMplsConformance 1 }
pwMplsCompliances OBJECT IDENTIFIER ::= { pwMplsConformance 2 }
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-- Compliance requirement for fully compliant implementations.
pwMplsModuleFullCompliance MODULE-COMPLIANCE
STATUS current
DESCRIPTION
"The compliance statement for agents that provide full
support for PW-MPLS MIB Module. Such devices can
then be monitored and also be configured using
this MIB module."
MODULE -- this module
MANDATORY-GROUPS { pwMplsGroup,
pwMplsOutboundMainGroup,
pwMplsInboundGroup,
pwMplsMappingGroup
}
GROUP pwMplsOutboundTeGroup
DESCRIPTION "This group MUST be supported if the implementation
allows MPLS TE tunnels to carry PW traffic.
"
OBJECT pwMplsMplsType
DESCRIPTION "Support of vcOnly(2) is not required. At least one
of mplsTe(0) or mplsNonTe(1) MUST be supported if
signaling of PW is supported.
"
OBJECT pwMplsExpBitsMode
DESCRIPTION "Support of specifiedValue(2) and
serviceDependant(3)
is optional.
"
OBJECT pwMplsLocalLdpID
MIN-ACCESS read-only
DESCRIPTION "A read-write access is required if the
implementation supports more than one LDP entity
identifier for PW signaling.
"
OBJECT pwMplsLocalLdpEntityID
MIN-ACCESS read-only
DESCRIPTION "A read-write access is required if the
implementation supports more than one LDP entity
index for PW signaling.
"
OBJECT pwMplsOutboundLsrXcIndex
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MIN-ACCESS read-only
DESCRIPTION "A value other than zero MUST be supported if the
implementation support non TE signaling of the
outer tunnel.
A read-write access MUST be supported if the
implementation supports manually setting of the PW
labels and carrying them over non-TE tunnels.
"
OBJECT pwMplsOutboundIfIndex
MIN-ACCESS read-only
DESCRIPTION "A value other than zero and read-write operations
MUST be supported if the implementation supports
manully configured PW without MPLS outer tunnel.
"
::= { pwMplsCompliances 1 }
-- Compliance requirement for Read Only compliant implementations.
pwMplsModuleReadOnlyCompliance MODULE-COMPLIANCE
STATUS current
DESCRIPTION
"The compliance statement for agents that provide read
only support for PW-MPLS MIB Module. Such devices can
then be monitored but cannot be configured using this
MIB module."
MODULE -- this module
MANDATORY-GROUPS { pwMplsGroup,
pwMplsOutboundMainGroup,
pwMplsInboundGroup,
pwMplsMappingGroup
}
GROUP pwMplsOutboundTeGroup
DESCRIPTION "This group MUST be supported if the implementation
allows MPLS TE tunnels to carry PW traffic.
"
OBJECT pwMplsMplsType
MIN-ACCESS read-only
DESCRIPTION "Write access is not required.
Support of vcOnly(2) is not required. At least one
of mplsTe(0) or mplsNonTe(1) MUST be supported if
signaling of PW is supported.
"
OBJECT pwMplsExpBitsMode
MIN-ACCESS read-only
DESCRIPTION "Write access is not required.
Support of specifiedValue(2) and
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serviceDependant(3)
is optional.
"
OBJECT pwMplsExpBits
MIN-ACCESS read-only
DESCRIPTION "Write access is not required.
"
OBJECT pwMplsTtl
MIN-ACCESS read-only
DESCRIPTION "Write access is not required.
"
OBJECT pwMplsLocalLdpID
MIN-ACCESS read-only
DESCRIPTION "Write access is not required.
"
OBJECT pwMplsLocalLdpEntityID
MIN-ACCESS read-only
DESCRIPTION "Write access is not required.
"
OBJECT pwMplsStorageType
MIN-ACCESS read-only
DESCRIPTION "Write access is not required.
"
OBJECT pwMplsOutboundLsrXcIndex
MIN-ACCESS read-only
DESCRIPTION "Write access is not required.
A value other than zero MUST be supported if the
implementation support non TE signaling of the
outer tunnel.
"
OBJECT pwMplsOutboundTunnelIndex
MIN-ACCESS read-only
DESCRIPTION "Write access is not required.
"
OBJECT pwMplsOutboundTunnelLclLSR
MIN-ACCESS read-only
DESCRIPTION "Write access is not required.
"
OBJECT pwMplsOutboundTunnelPeerLSR
MIN-ACCESS read-only
DESCRIPTION "Write access is not required.
"
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OBJECT pwMplsOutboundIfIndex
MIN-ACCESS read-only
DESCRIPTION "Write access is not required.
A value other than zero MUST be supported if the
implementation supports manually configured PW
without MPLS outer tunnel.
"
::= { pwMplsCompliances 2 }
-- Units of conformance.
pwMplsGroup OBJECT-GROUP
OBJECTS {
pwMplsMplsType,
pwMplsExpBitsMode,
pwMplsExpBits,
pwMplsTtl,
pwMplsLocalLdpID,
pwMplsLocalLdpEntityID,
pwMplsPeerLdpID,
pwMplsStorageType
}
STATUS current
DESCRIPTION
"Collection of objects needed for PW over MPLS PSN
configuration."
::= { pwMplsGroups 1 }
pwMplsOutboundMainGroup OBJECT-GROUP
OBJECTS {
pwMplsOutboundLsrXcIndex,
pwMplsOutboundIfIndex,
pwMplsOutboundTunnelTypeInUse
}
STATUS current
DESCRIPTION
"Collection of objects needed for outbound association of
PW and MPLS tunnel."
::= { pwMplsGroups 2 }
pwMplsOutboundTeGroup OBJECT-GROUP
OBJECTS {
pwMplsOutboundTunnelIndex,
pwMplsOutboundTunnelInstance,
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pwMplsOutboundTunnelLclLSR,
pwMplsOutboundTunnelPeerLSR
}
STATUS current
DESCRIPTION
"Collection of objects needed for outbound association of
PW and MPLS TE tunnel."
::= { pwMplsGroups 3 }
pwMplsInboundGroup OBJECT-GROUP
OBJECTS {
pwMplsInboundXcIndex
}
STATUS current
DESCRIPTION
"Collection of objects needed for inbound PW presentation.
This group MUST be supported if PW signaling through LDP is
used."
::= { pwMplsGroups 4 }
pwMplsMappingGroup OBJECT-GROUP
OBJECTS {
pwMplsNonTeMappingVcIndex,
pwMplsTeMappingVcIndex
}
STATUS current
DESCRIPTION
"Collection of objects needed for mapping association of
PW and MPLS tunnel."
::= { pwMplsGroups 5 }
END
6. Security Considerations
It is clear that this MIB module is potentially useful for
monitoring of PW capable PEs. This MIB module can also be used for
configuration of certain objects, and anything that can be
configured can be incorrectly configured, with potentially
disastrous results.
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
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sensitivity/vulnerability:
o the pwMplsTable, pwMplsNonTeMappingTable and
pwMplsTeMappingTable collectively contain objects to
provision PW over MPLS tunnels. 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 v3 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:
o the pwMplsTable, pwMplsNonTeMappingTable,
pwMplsTeMappingTable and pwMplsOutboundTable
collectively show the PW over MPLS association.
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".
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.
7 References
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7.1 Normative references
[PWCNTRL] Martini et al, "Pseudowire Setup and Maintenance using
LDP", draft-ietf-pwe3-control-protocol-17.txt,
June 2005.
[RFC3985] Bryant, S., et al, "PWE3 Architecture",RFC2985,
March 2005
[PWTC] Nadeau, T., et al, "Definitions for Textual Conventions
and OBJECT-IDENTITIES for Pseudo-Wires Management",
work-in-progress.
[PWMIB] Zelig, D., et al, "Pseudo Wire (PW) Management
Information Base", work-in-progress.
[RFC2863] McCloghrie, K., Kastenholz, F., "The Interfaces Group
MIB", RFC 2863, June 2000.
[RFC3031] Rosen, E., Viswanathan, A., and R. Callon,
"Multiprotocol Label Switching Architecture", RFC 3031,
Jan 2001.
[RFC3813] Srinivasan, C., Viswanathan, A., and Nadeau, T., "MPLS
Label Switch Router Management Information Base Using
SMIv2", work-in-progress.
[RFC3814] Srinivasan, C., Viswanathan, A., and Nadeau, T., "MPLS
Traffic Engineering Management Information Base Using
SMIv2", RFC3812.
[RFC3811] Nadeau, T., Cucchiara, J., "Definition of Textual
Conventions and OBJECT-IDENTITIES for Multi-Protocol
Label Switching (MPLS) Management", RFC 3811, June
2004.
[RFC3036] Andersson, L., et al, "LDP specification", RFC 3036,
January 2001.
[RFC2578] McCloghrie, K., Perkins, D., Schoenwaelder, J., Case,
J.,Rose, M. and S. Waldbusser, "Structure of Management
Information Version 2 (SMIv2)", STD 58, RFC 2578, April
1999.
[RFC2579] McCloghrie, K., Perkins, D., Schoenwaelder, J., Case,
J., Rose, M. and S. Waldbusser, "Textual Conventions
for SMIv2", STD 58, RFC 2579, April 1999.
[RFC2580] McCloghrie, K., Perkins, D., Schoenwaelder, J., Case,
J., Rose, M. and S. Waldbusser, "Conformance Statements
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for SMIv2", STD 58, RFC 2580, April 1999.
7.2 Informative references
[RFC3036] Andersson, L., Doolan, P., Feldman, N., Fredette, A., and
B. Thomas, "LDP Specification", RFC 3036, January 2001.
[RFC3410] Case, J., Mundy, R., Partain, D. and B. Stewart,
Introduction and Applicability Statements for Internet-
Standard Management Framework", RFC 3410, December
2002.
8. Editors' Addresses
David Zelig
Corrigent Systems
126, Yigal Alon st.
Tel Aviv, ISRAEL
Phone: +972-3-6945273
Email: davidz@corrigent.com
Thomas D. Nadeau
Cisco Systems, Inc.
250 Apollo Drive
Chelmsford, MA 01824
Email: tnadeau@cisco.com
9. Contributors' Addresses
Dave Danenberg
Email: dave_danenberg@yahoo.com
Andrew G. Malis
Tellabs, Inc.
2730 Orchard Parkway
San Jose, CA 95134
Email: Andy.Malis@tellabs.com
Sharon Mantin
AxONLink (Israel) Ltd
9 Bareket St.
Petah Tikva 49517, Israel
Phone: +972-3-9263972
Email: sharon.mantin@axonlink.com
10. Intellectual Property Statement
The IETF takes no position regarding the validity or scope of any
Intellectual Property Rights or other rights that might be claimed to
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Internet Draft PW-MPLS-STD-MIB July 2005
pertain to the implementation or use of the technology described in
this document or the extent to which any license under such rights
might or might not be available; nor does it represent that it has
made any independent effort to identify any such rights. Information
on the procedures with respect to rights in RFC documents can be
found in BCP 78 and BCP 79.
Copies of IPR disclosures made to the IETF Secretariat and any
assurances of licenses to be made available, or the result of an
attempt made to obtain a general license or permission for the use of
such proprietary rights by implementers or users of this
specification can be obtained from the IETF on-line IPR repository at
http://www.ietf.org/ipr.
The IETF invites any interested party to bring to its attention any
copyrights, patents or patent applications, or other proprietary
rights that may cover technology that may be required to implement
this standard. Please address the information to the IETF at ietf-
ipr@ietf.org.
11. Full Copyright Statement
Copyright (C) The Internet Society (2005). This document is
subject to the rights, licenses and restrictions contained in BCP
78, and except as set forth therein, the authors retain all their
rights.
This document and the information contained herein are provided
on an "AS IS" basis and THE CONTRIBUTOR, THE ORGANIZATION HE/SHE
REPRESENTS OR IS SPONSORED BY (IF ANY), THE INTERNET SOCIETY AND
THE INTERNET ENGINEERING TASK FORCE DISCLAIM ALL WARRANTIES,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT
THE USE OF THE INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR
ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A
PARTICULAR PURPOSE.
12. IANA Considerations
PWE3 related standards track PW modules should be
rooted under the pwMIB subtree. The IANA is requested to manage
that namespace. New assignments can only be made via a Standards
Action as specified in [RFC2434].
IANA is requested to make a MIB OID assignment under the
pwMIB branch as specified in section 11.1.
12.1 IANA Considerations for PW-MPLS-STD-MIB
This document also requests IANA to assign { pwMIB 4 } to the
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PW-MPLS-STD-MIB module specified in this document.
Acknowledgement
Funding for the RFC Editor function is currently provided by the
Internet Society.
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