Network Working Group D. Zelig, Ed.

Network Working Group D. Zelig, Ed.
Request for Comments: 5603 Oversi
Category: Standards Track T. Nadeau, Ed.
BT
July 2009

Ethernet Pseudowire (PW) Management Information Base (MIB)

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 modeling of Ethernet
pseudowire (PW) services.

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.

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Table of Contents

1. Introduction ....................................................2
2. The Internet-Standard Management Framework ......................2
3. Conventions .....................................................3
4. Overview ........................................................3
5. Feature Checklist ...............................................4
6. PW ENET MIB Module Usage ........................................4
7. PW-ENET Management Model ........................................5
8. Example of the PW-ENET MIB Module Usage .........................6
9. Service-Delimiting Modes ........................................6
10. Object Definitions .............................................9
11. Security Considerations .......................................19
12. IANA Considerations ...........................................21
13. References ....................................................21
13.1. Normative References .....................................21
13.2. Informative References ...................................22
14. Acknowledgments ...............................................22

1. Introduction

This document describes a model for managing Ethernet pseudowire
services for transmission over a Packet Switched Network (PSN). This
MIB module is generic and common to all types of PSNs supported in
the Pseudowire Emulation Edge-to-Edge (PWE3) architecture [RFC3985],
which describes the transport and encapsulation of L1 and L2 services
over supported PSN types.

In particular, the MIB module associates a port or specific VLANs on
top of a physical Ethernet port or a virtual Ethernet interface (for
Virtual Private LAN Service (VPLS)) to a point-to-point PW. It is
complementary to the PW-STD-MIB [RFC5601], which manages the generic
PW parameters common to all services, including all supported PSN
types.

2. 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 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

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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].

3. 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].

This document adopts the definitions, acronyms, and mechanisms
described in [RFC3985] and [RFC3916]. Unless otherwise stated, the
mechanisms of [RFC3985] apply and will not be re-described here.

4. Overview

The MIB module structure for defining a PW service is composed of
three layers of MIB modules functioning together. This general model
is defined in the PWE3 architecture [RFC3985]. The layering model is
intended to sufficiently isolate PW services from the underlying PSN
layer that carries the emulated service. This is done at the same
time as providing a standard means for connecting any supported
services to any supported PSNs.

The first layer, known as the service layer, contains service-
specific modules. These modules define service-specific management
objects that interface or collaborate with existing MIB modules for
the native version of the service. The service-specific module
"glues" the standard modules to the PWE3 MIB modules.

The next layer of the PWE3 MIB framework is the PW MIB module
[RFC5601]. This module is used to configure general parameters of
PWs that are common to all types of emulated services and PSNs. This
layer is connected to the service-specific layer above and the PSN
layer below.

The PSN layer provides PSN-specific modules 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 used to "glue" the PW
service to the underlying PSN-specific MIB modules. This document
defines the MIB module for Ethernet PW over any PSN type.

This module uses Textual Conventions (TCs) and objects as defined in
[RFC2578], [RFC2579], [RFC2580], [RFC2863], [RFC4363], [RFC4502], and
[RFC5601].

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The Etherlike-MIB [RFC3635] does not support virtual Ethernet ports;
however, it is sometimes desired to manage the PW as an Ethernet port
via the Etherlike-MIB. This MIB module supports an option to
recognize the PW as an ifIndex, enabling standard use of the
Etherlike-MIB to manage the PW.

5. Feature Checklist

The PW Ethernet MIB module (PW-ENET-STD-MIB) is designed to satisfy
the following requirements and constraints:

- The MIB module is designed to work with the PW-STD-MIB [RFC5601].

- The MIB module is agnostic to the PSN type.

- The MIB module supports various options for selecting Ethernet
packets into the PW, as defined in [RFC4448]. These include
port-based PW, VLAN-based PW, and VLAN-manipulated based (change,
add, or remove) between the port to be emulated and the PW.

- In the case of an MPLS PSN, the MIB module supports the use of
multiple PWs to carry the same Ethernet service. These PWs can be
used to support Label-Only-Inferred-PSC LSPs (L-LSPs) or EXP-
Inferred-PSC LSPs (E-LSPs) that are from a single Class of Service
(CoS), when mapping of the Ethernet user priority (PRI) bits to
the PSN CoS is required.

- The MIB module enables both point-to-point Ethernet services and
VPLS services as discussed in the L2VPN working group [RFC4664].

- The MIB module allows modeling of the PW as an Ethernet virtual
port to be managed via existing Ethernet MIBs like Etherlike-MIB
[RFC3635].

6. PW ENET MIB Module Usage

- The PW table (pwTable) is used for all PW types (ATM, FR,
Ethernet, SONET, etc.). This table contains high-level generic
parameters related to the PW creation. A row is typically created
by the operator (see [RFC5542] for other options) for each PW
service.

- Based on the PSN type defined for the PW, rows are created in the
PSN-specific module (for example, [RFC5602]) and associated to the
pwTable by the common pwIndex.

- If the PW type is Ethernet or EthernetTagged a row is created by
the agent in the pwEnetTable.

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7. PW-ENET Management Model

The management model for the Ethernet PW is shown in Figure 1, and is
based on the PW layering [RFC3985].

+--------------------------------------+
| PE Device |
+--------------------------------------+
Single | | |
AC | | Single | PW Instance
<------>o Forwarder + PW Instance X<=========>
| | |
+--------------------------------------+
^
|
May be modeled as
ifIndex

Notation: o A physical CE-bound PE port.
+ A PW IWF instance interface to the forwarder.
X A PE PSN-bound port.

Figure 1: A simple point-to-point service

In the typical point-to-point service, the object pwEnetPortIfIndex
associates the physical CE-bound PE port ('o') to the PW (it is
allowed to have multiple PWs associated to the same physical port).
This MIB module also manages some of the possible operations of the
forwarder.

In some models, it is convenient to model the forwarder virtual
interface to a PW IWF instance ('+') as an ifIndex. As discussed in
[RFC5601], this is possible by using the PW ifType in the ifTable and
indicating the ifIndex in the main pwTable. In case of Ethernet PW,
a virtual interface of ifType = etherLike will be assigned on top of
the PW interface to enable statistics gathering and statuses and
other management configuration tasks via existing tools. This way,
the PW instance is managed as virtual Ethernet interface in the PE.

The model for using the PW in non-point-to-point applications, such
as VPLS, is done with the same principle in mind, except that the
creation of the tables is related typically to an auto-discovery
process.

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8. Example of the PW-ENET MIB Module Usage

Assume we would like to create a PW of type VLAN between two PEs, for
VLAN value 5.

- Follows the example in [RFC5601], with pwType equals
'ethernetTagged'.

- The agent creates a row in the pwEnetTable and a row in the
pwEnetStatsTable for the specified pwIndex. The pwEnetPwInstance
is automatically set by the agent to the value of 1.

- The operator fills the following entries in the pwEnetTable:

pwEnetPwVlan 5,
pwEnetVlanMode noChange,
pwEnetPortVlan 5,

pwEnetPortIfIndex 1001,
pwEnetPwIfIndex 0, -- Not managed in the
-- Etherlike MIB module
...

- The PW is ready for forwarding when signaling has been
accomplished successfully between the two peers.

9. Service-Delimiting Modes

This section describes how the MIB module supports point-to-point
applications with various VLAN service-delimiting options on the
original Ethernet port and the corresponding PW mode and VLAN values.
If the PW is attached to VPLS service, the PW is associated to a
virtual interface that is attached to a bridge or VPLS forwarder.
The bridging function between local physical ports and virtual
interfaces that are later associated to PWs is not handled via this
MIB module.

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There are three main service types that are supported by this MIB
module:

(1) Port mode: In this mode, the whole traffic from the port is
mapped to the PW.

A. In the typical application, the packet is sent to the PW as
is:

pwEnetPwVlan 4095,
pwEnetVlanMode portMode,
pwEnetPortVlan 4095,

pwType Ethernet,

B. It is possible to add a provider tag (value 10, for example)
to the packet when it is sent over the PW:

pwEnetPwVlan 10,
pwEnetVlanMode addVlan,
pwEnetPortVlan 4095,

pwType SHOULD be set to 'EthernetTagged'.

(2) Single VLAN: In this mode, only the first VLAN field on the
packet from the physical port is the service-delimiting tag, as
an example VLAN=5. The following options of processing are
possible:

A. One-to-one mapping: The service-delimiting tag is kept as is
on the PW.

pwEnetPwVlan 5,
pwEnetVlanMode noChange,
pwEnetPortVlan 5,

pwType SHOULD be set to 'EthernetTagged'.

B. VLAN change mapping: The service-delimiting tag changes its
value (to the value of 6) on the PW.

pwEnetPwVlan 6,
pwEnetVlanMode changeVlan,
pwEnetPortVlan 5,

pwType SHOULD be set to 'EthernetTagged'.

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C. The service-delimiting tag is removed when the packet is
sent to the PW.

pwEnetPwVlan 4095,
pwEnetVlanMode removeVlan,
pwEnetPortVlan 5,

pwType SHOULD be set to 'EthernetTagged'.

It should be noted that this mode is also applicable when
the service-delimiting tag is a service provider tag (VLAN=5
in this case), and the node removes this VLAN and maps the
traffic to a single PW independent of the packet format on
top of this VLAN.

D. Untagged packets mapped to a PW as is (packets with a VLAN
field from the same port MAY be mapped to other PWs).

pwEnetPwVlan 0,
pwEnetVlanMode noChange,
pwEnetPortVlan 0,

pwType MAY equal 'Ethernet' or 'EthernetTagged'.

E. Untagged packets mapped to a PW, and a VLAN field is added
to the packet.

pwEnetPwVlan 6,
pwEnetVlanMode addVlan,
pwEnetPortVlan 0,

pwType SHOULD be set to 'EthernetTagged'.

F. A provider VLAN (value 10) is added to packets arriving with
VLAN value 5 before they are sent to the PW.

pwEnetPwVlan 10,
pwEnetVlanMode addVlan,
pwEnetPortVlan 5,

pwType SHOULD be set to 'EthernetTagged'.

(3) Nested VLAN (QinQ): When only the first VLAN is the service-
delimiting tag, one of the modes as described in 2) SHOULD be
used. If the service-delimiting tag is both the first VLAN and
the second VLAN, the following option is supported by this MIB
module:

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Assuming the provider VLAN tag equals 5 and the user VLAN tag
equal 100, this traffic can be mapped to the PW without the
provider tag by using the following configuration:

pwEnetPwVlan 100,
pwEnetVlanMode removeVLAN,
pwEnetPortVlan 5,

It is RECOMMENDED that the pwType would equal 'EthernetTagged',
but pwType equal to 'Ethernet' MAY be used as well.

Packets with the same provider tag MAY be mapped to other PWs.

(4) Other scenarios are considered out of scope and should be
handled by other MIB modules that manage the forwarder and the
Native Service Processing (NSP) sections.

10. Object Definitions

PW-ENET-STD-MIB DEFINITIONS ::= BEGIN

IMPORTS
OBJECT-TYPE, MODULE-IDENTITY, Unsigned32, mib-2
FROM SNMPv2-SMI -- [RFC2578]

MODULE-COMPLIANCE, OBJECT-GROUP
FROM SNMPv2-CONF -- [RFC2580]

StorageType, RowStatus
FROM SNMPv2-TC -- [RFC2579]

InterfaceIndexOrZero
FROM IF-MIB -- [RFC2863]

ZeroBasedCounter32
FROM RMON2-MIB -- [RFC4502]

pwIndex
FROM PW-STD-MIB -- [RFC5601]

VlanIdOrAnyOrNone
FROM Q-BRIDGE-MIB; -- [RFC4363]

pwEnetStdMIB MODULE-IDENTITY
LAST-UPDATED "200906150000Z" -- 15 June 2009 00:00:00 GMT

ORGANIZATION "Pseudowire Edge-to-Edge Emulation (PWE3) Working
Group"

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CONTACT-INFO
"David Zelig
Email: [email protected]

Thomas D. Nadeau
Email: [email protected]
"
DESCRIPTION
"This MIB module describes a model for managing Ethernet
point-to-point pseudowire services over a Packet
Switched Network (PSN).

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 5603;

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see the RFC itself for full legal notices."

-- Revision history
REVISION "200906150000Z" -- 15 June 2009 00:00:00 GMT
DESCRIPTION "Initial version published as part of RFC 5603."

::= { mib-2 180 }

pwEnetObjects OBJECT IDENTIFIER ::= { pwEnetStdMIB 1 }
pwEnetConformance OBJECT IDENTIFIER ::= { pwEnetStdMIB 2 }

--
-- Ethernet PW table
--

pwEnetTable OBJECT-TYPE
SYNTAX SEQUENCE OF PwEnetEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This table contains the index to the Ethernet tables
associated with this Ethernet PW, the VLAN configuration,
and the VLAN mode."
::= { pwEnetObjects 1 }

pwEnetEntry OBJECT-TYPE
SYNTAX PwEnetEntry
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 generic table in the

PW-STD-MIB module.
The pwIndex and the pwEnetPwInstance are used as indexes
to allow multiple VLANs to exist on the same PW.

An entry is created in this table by the agent for every
entry in the pwTable with a pwType of 'ethernetTagged'
or 'ethernet'. Additional rows may be created by the
operator or the agent if multiple entries are required for
the same PW.

The value of pwEnetPwInstance can be arbitrarily selected
to make the row unique; however, implementations that know
the VLAN field value when the row is created MAY use the
value of the VLAN itself for better readability and
backward compatibility with older versions of this MIB

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module.

This table provides Ethernet port mapping and VLAN
configuration for each Ethernet PW.

All read-create objects in this table MAY be changed at any
time; however, change of some objects (for example,
pwEnetVlanMode) during the PW forwarding state MAY cause traffic
disruption.

Manual entries in this table SHOULD be preserved after a
reboot, and the agent MUST ensure the integrity of those
entries. If the set of entries of a specific row is found to
be inconsistent after reboot, the PW pwOperStatus MUST be
declared as notPresent(5).
"

INDEX { pwIndex, pwEnetPwInstance }
::= { pwEnetTable 1 }

PwEnetEntry ::= SEQUENCE {
pwEnetPwInstance Unsigned32,
pwEnetPwVlan VlanIdOrAnyOrNone,
pwEnetVlanMode INTEGER,
pwEnetPortVlan VlanIdOrAnyOrNone,

pwEnetPortIfIndex InterfaceIndexOrZero,
pwEnetPwIfIndex InterfaceIndexOrZero,

pwEnetRowStatus RowStatus,
pwEnetStorageType StorageType
}

pwEnetPwInstance OBJECT-TYPE
SYNTAX Unsigned32
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"If multiple rows are mapped to the same PW, this index is
used to uniquely identify the individual row.
If the value of the VLAN field is known at the time of
row creation, the value of pwEnetPwVlan MAY be used
for better readability and backward compatibility with
older versions of this MIB module. Otherwise, the value
1 SHOULD be set to the first row for each pwIndex
for better readability and in order that the management
application will know in advance how to access the
first row when it was created by the agent.

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"
::= { pwEnetEntry 1 }

pwEnetPwVlan OBJECT-TYPE
SYNTAX VlanIdOrAnyOrNone
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This object defines the (service-delimiting) VLAN field
value on the PW. The value 4095 MUST be used if the
object is not applicable, for example, when mapping all
packets from an Ethernet port to this PW (raw mode).
The value 0 MUST be set to indicate untagged frames
(from the PW point of view), i.e., when pwEnetVlanMode
equals 'noChange' and pwEnetPortVlan equals 0."
::= { pwEnetEntry 2 }

pwEnetVlanMode OBJECT-TYPE
SYNTAX INTEGER {
other(0),
portBased(1),
noChange(2),
changeVlan(3),
addVlan(4),
removeVlan(5)
}
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This object indicates the mode of VLAN handling between the
port or the virtual port associated with the PW and the
PW encapsulation.

- 'other' indicates an operation that is not defined by
this MIB module.

- 'portBased' indicates that the forwarder will forward
packets between the port and the PW independent of their
structure (i.e., there are no service-delimiting VLAN tags
from the PE standpoint).

- 'noChange' indicates that the PW contains the original
user VLAN, as specified in pwEnetPortVlan; i.e., the
VLAN on the PE-CE link is the service-delimiting tag
and is kept 'as is' on the PW.

- 'changeVlan' indicates that the VLAN field on the PW
may be different than the VLAN field on the user's

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port. The VLAN on the PE-CE link is the service-delimiting
tag but has a different value on the PW.

- 'addVlan' indicates that a VLAN field will be added
on the PSN-bound direction (i.e., on the PW). pwEnetPwVlan
indicates the value that will be added.

- 'removeVlan' indicates that the encapsulation on the
PW does not include the service-delimiting VLAN field.
Note that PRI bits transparency is lost in this case.

- Implementation of 'portsbased', 'removeVlan', 'addVlan'
'other', and 'changeVlan' is OPTIONAL.
"
DEFVAL { noChange }
::= { pwEnetEntry 3 }

pwEnetPortVlan OBJECT-TYPE
SYNTAX VlanIdOrAnyOrNone
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This object defines if the mapping between the original port
(physical port or VPLS virtual port) to the PW is VLAN based
or not. In case of VLAN mapping, this object indicates the
VLAN value on the original port.

The value of '4095' MUST be used if the whole original port
traffic is mapped to the same PW. Note that a pwType of
'ethernetTagged' can still be used if service-delimiting tag
is added on the PW (pwEnetVlanMode equals 'addVlan').

This object MUST be equal to pwEnetPwVlan if pwEnetVlanMode
equals 'noChange'.

The value 0 indicates that packets without a VLAN field
(i.e., untagged frames) on the port are associated to this
PW. This allows the same behavior as assigning 'Default
VLAN' to untagged frames.
"
DEFVAL { 4095 }
::= { pwEnetEntry 4 }

pwEnetPortIfIndex OBJECT-TYPE
SYNTAX InterfaceIndexOrZero
MAX-ACCESS read-create
STATUS current
DESCRIPTION

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"This object is used to specify the ifIndex of the Ethernet
port associated with this PW for point-to-point Ethernet
service, or the ifIndex of the virtual interface of the
VPLS instance associated with the PW if the service is
VPLS. Two rows in this table can point to the same ifIndex
only if there is no overlap of VLAN values specified in
pwEnetPortVlan that are associated with this port.

A value of zero indicates that association to an ifIndex is
not yet known."

::= { pwEnetEntry 5 }

pwEnetPwIfIndex OBJECT-TYPE
SYNTAX InterfaceIndexOrZero
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"If the PW is modeled as an ifIndex in the ifTable, this
object indicates the value of the ifIndex representing the
Ethernet PW on the PSN side in the Etherlike-MIB. Note that
this value may be different from the value of pwIfIndex
that represents the ifIndex of the PW for ifType 'pw'."
DEFVAL { 0 }
::= { pwEnetEntry 6 }

pwEnetRowStatus OBJECT-TYPE
SYNTAX RowStatus
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This object enables creating, deleting, and modifying this
row."
::= { pwEnetEntry 7 }

pwEnetStorageType OBJECT-TYPE
SYNTAX StorageType
MAX-ACCESS read-create
STATUS current
DESCRIPTION
"This object indicates the storage type of this row."
DEFVAL { nonVolatile }
::= { pwEnetEntry 8 }

--
-- Ethernet PW Statistics Table
--

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pwEnetStatsTable OBJECT-TYPE
SYNTAX SEQUENCE OF PwEnetStatsEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"This table contains statistical counters specific for
Ethernet PW."
::= { pwEnetObjects 2 }

pwEnetStatsEntry OBJECT-TYPE
SYNTAX PwEnetStatsEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"Each entry represents the statistics gathered for the
PW carrying the Ethernet."
INDEX { pwIndex }
::= { pwEnetStatsTable 1 }

PwEnetStatsEntry ::= SEQUENCE {
pwEnetStatsIllegalVlan ZeroBasedCounter32,
pwEnetStatsIllegalLength ZeroBasedCounter32
}

pwEnetStatsIllegalVlan OBJECT-TYPE
SYNTAX ZeroBasedCounter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of packets received (from the PSN) on this PW
with either an illegal VLAN field, a missing VLAN field
when one was expected, or an excessive VLAN field when
it was not expected. This counter may not be applicable
in some cases, and MUST return the value of zero in
such a case."
::= { pwEnetStatsEntry 1 }

pwEnetStatsIllegalLength OBJECT-TYPE
SYNTAX ZeroBasedCounter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of packets that were received with an illegal
Ethernet packet length on this PW. An illegal length is
defined as being greater than the value in the advertised
MTU supported, or shorter than the allowed Ethernet packet
size."

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::= { pwEnetStatsEntry 2 }

---
--- Conformance description
---

pwEnetGroups OBJECT IDENTIFIER ::= { pwEnetConformance 1 }
pwEnetCompliances OBJECT IDENTIFIER ::= { pwEnetConformance 2 }

-- Compliance requirement for fully compliant implementations

pwEnetModuleFullCompliance MODULE-COMPLIANCE
STATUS current
DESCRIPTION
"The compliance statement for agents that provides full
support for the PW-ENET-STD-MIB module. Such devices
can then be monitored and also be configured using
this MIB module."
MODULE -- this module
MANDATORY-GROUPS {
pwEnetGroup,
pwEnetStatsGroup
}

OBJECT pwEnetVlanMode
DESCRIPTION "An implementation MUST support at least the value
noChange(2)."

OBJECT pwEnetPwIfIndex
MIN-ACCESS read-only
DESCRIPTION "Write access and values other than zero are
required only for implementations that support
modeling the Ethernet PW in the Etherlike-MIB."
OBJECT pwEnetRowStatus
SYNTAX RowStatus { active(1), notInService(2),
notReady(3) }
WRITE-SYNTAX RowStatus { active(1), notInService(2),
createAndGo(4), destroy(6)
}
MIN-ACCESS read-only
DESCRIPTION "Support for createAndWait is not required. Support
of notReady is not required for implementations that
do not support signaling.
Support of read-write is not required for
implementations that do not support more than one
VLAN mapping to the same PW."
::= { pwEnetCompliances 1 }

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-- Compliance requirement for read-only compliant implementations

pwEnetModuleReadOnlyCompliance MODULE-COMPLIANCE
STATUS current
DESCRIPTION
"The compliance statement for agents that provide read-
only support for the PW-ENET-STD-MIB module. Such
devices can then be monitored but cannot be configured
using this MIB module."

MODULE -- this module
MANDATORY-GROUPS { pwEnetGroup,
pwEnetStatsGroup
}

OBJECT pwEnetPwVlan
MIN-ACCESS read-only
DESCRIPTION "Write access is not required."

OBJECT pwEnetVlanMode
MIN-ACCESS read-only
DESCRIPTION "Write access is not required. An implementation
MUST support at least the value noChange(2)."

OBJECT pwEnetPortVlan
MIN-ACCESS read-only
DESCRIPTION "Write access is not required."

OBJECT pwEnetPortIfIndex
MIN-ACCESS read-only
DESCRIPTION "Write access is not required."

OBJECT pwEnetPwIfIndex
MIN-ACCESS read-only
DESCRIPTION "Write access is not required. Values other than
zero are required only for implementations that
support modeling the Ethernet PW in the
Etherlike-MIB."

OBJECT pwEnetRowStatus
SYNTAX RowStatus { active(1), notInService(2),
notReady(3) }
MIN-ACCESS read-only
DESCRIPTION "Write access is not required. Support
of notReady is not required for implementations that
do not support signaling."

OBJECT pwEnetStorageType

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RFC 5603 ENET MIB July 2009

MIN-ACCESS read-only
DESCRIPTION "Write access is not required."

::= { pwEnetCompliances 2 }

-- Units of conformance

pwEnetGroup OBJECT-GROUP
OBJECTS {
pwEnetPwVlan,
pwEnetVlanMode,
pwEnetPortVlan,
pwEnetPortIfIndex,
pwEnetPwIfIndex,
pwEnetRowStatus,
pwEnetStorageType
}
STATUS current
DESCRIPTION
"Collection of objects for basic Ethernet PW configuration."
::= { pwEnetGroups 1 }

pwEnetStatsGroup OBJECT-GROUP
OBJECTS {
pwEnetStatsIllegalVlan,
pwEnetStatsIllegalLength
}
STATUS current
DESCRIPTION
"Collection of objects counting various PW level errors."
::= { pwEnetGroups 2 }

END

11. 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
sensitivity/vulnerability:

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RFC 5603 ENET MIB July 2009

o the pwEnetTable contains objects to provision Ethernet PWs.
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 that 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 pwEnetTable shows the Ethernet PW service configuration. 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.

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RFC 5603 ENET MIB July 2009

12. IANA Considerations

The MIB module in this document uses the following IANA-assigned
OBJECT IDENTIFIER value recorded in the SMI Numbers registry:

Descriptor OBJECT IDENTIFIER value
---------- -----------------------

pwEnetStdMIB { mib-2 180 }

13. References

13.1. Normative References

[BCP14] Bradner, S., "Key words for use in RFCs to Indicate
requirement Levels", BCP 14, RFC 2119, March 1997.

[RFC2578] McCloghrie, K., Ed., Perkins, D., Ed., and J.
Schoenwaelder, Ed., "Structure of Management Information
Version 2 (SMIv2)", STD 58, RFC 2578, April 1999.

[RFC2579] McCloghrie, K., Ed., Perkins, D., Ed., and J.
Schoenwaelder, Ed., "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.

[RFC2863] McCloghrie, K. and F. Kastenholz, "The Interfaces Group
MIB", RFC 2863, June 2000.

[RFC3635] Flick, J., "Definitions of Managed Objects for the
Ethernet-like Interface Types", RFC 3635, September 2003.

[RFC4448] Martini, L., Ed., Rosen, E., El-Aawar, N., and G. Heron,
"Encapsulation Methods for Transport of Ethernet over MPLS
Networks", RFC 4448, April 2006.

[RFC4502] Waldbusser, S., "Remote Network Monitoring Management
Information Base Version 2", RFC 4502, May 2006.

[RFC4363] Levi, D. and D. Harrington, "Definitions of Managed
Objects for Bridges with Traffic Classes, Multicast
Filtering, and Virtual LAN Extensions", RFC 4363, January
2006.

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RFC 5603 ENET MIB July 2009

[RFC5601] Zelig, D., Ed., and T. Nadeau, Ed., "Pseudowire (PW)
Management Information Base (MIB)", RFC 5601, July 2009.

13.2. Informative References

[RFC3410] Case, J., Mundy, R., Partain, D., and B. Stewart,
"Introduction and Applicability Statements for Internet-
Standard Management Framework", RFC 3410, December 2002.

[RFC3916] Xiao, X., Ed., McPherson, D., Ed., and P. Pate, Ed.,
"Requirements for Pseudo-Wire Emulation Edge-to-Edge
(PWE3)", RFC 3916, September 2004.

[RFC3985] Bryant, S., Ed., and P. Pate, Ed., "Pseudo Wire Emulation
Edge-to-Edge (PWE3) Architecture", RFC 3985, March 2005.

[RFC4664] Andersson, L., Ed., and E. Rosen, Ed., "Framework for
Layer 2 Virtual Private Networks (L2VPNs)", RFC 4664,
September 2006.

[RFC5542] Nadeau, T., Ed., Zelig, D., Ed., and O. Nicklass, Ed.,
"Definitions of Textual Conventions for Pseudowires (PW)
Management", RFC 5542, May 2009.

[RFC5602] Zelig, D., Ed., and T. Nadeau, Ed., "Pseudowire (PW) over
MPLS PSN Management Information Base (MIB)", RFC 5602,
July 2009.

14. Acknowledgments

This document was produced by the PWE3 Working Group. Special thanks
to Orly Nicklass for close review and good suggestions.

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RFC 5603 ENET MIB July 2009

Authors' Addresses

David Zelig (editor)
Oversi Networks
1 Rishon Letzion St.
Petah Tikva
Israel

Phone: +972 77 3337 750
EMail: [email protected]

Thomas D. Nadeau (editor)
BT
BT Centre
81 Newgate Street
London EC1A 7AJ
United Kingdom

EMail: [email protected]

Zelig & Nadeau Standards Track [Page 23]