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Cisco IOS Software Releases 12.2 SR

Remote Port Shutdown

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Remote Port Shutdown

Contents

Prerequisites for Remote Port Shutdown

Restrictions for Remote Port Shutdown

Information About Remote Port Shutdown

Ethernet Virtual Circuit

Ethernet LMI

OAM Manager

Benefits of Remote Port Shutdown

How to Configure Remote Port Shutdown

Specifying LDP as an OAM Protocol

Configuration Examples for Remote Port Shutdown

Specifying LDP As the OAM Protocol and Associating a Service Instance to an EVC: Example

Configuring Xconnect Directly on an Interface: Example

Additional References

Related Documents

Standards

MIBs

RFCs

Technical Assistance

Command Reference

oam protocol

Feature Information for Remote Port Shutdown


Remote Port Shutdown

First Published: February 27, 2007
Last Updated: February 27, 2007

The Remote Port Shutdown feature uses Ethernet Local Management Interface (LMI) in an Ethernet over Multiprotocol Label Switching (EoMPLS) network to propagate remote link status to a customer edge (CE) device.

Finding Feature Information in This Module

Your Cisco IOS software release may not support all of the features documented in this module. To reach links to specific feature documentation in this module and to see a list of the releases in which each feature is supported, use the "Feature Information for Remote Port Shutdown" section.

Finding Support Information for Platforms and Cisco IOS and Catalyst OS Software Images

Use Cisco Feature Navigator to find information about platform support and Cisco IOS and Catalyst OS software image support. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.

Contents

•Prerequisites for Remote Port Shutdown

•Restrictions for Remote Port Shutdown

•Information About Remote Port Shutdown

•How to Configure Remote Port Shutdown

•Configuration Examples for Remote Port Shutdown

•Additional References

•Command Reference

•Feature Information for Remote Port Shutdown

Prerequisites for Remote Port Shutdown

•Ethernet LMI must be enabled for the Remote Port Shutdown feature to function.

Restrictions for Remote Port Shutdown

•Connectivity Fault Management and Lightweight Directory Protocol (LDP) cannot be configured at the same time.

Information About Remote Port Shutdown

To configure the Remote Port Shutdown feature, you should understand the following concepts:

•Ethernet Virtual Circuit

•Ethernet LMI

•OAM Manager

•Benefits of Remote Port Shutdown

Ethernet Virtual Circuit

An Ethernet virtual circuit (EVC) as defined by the Metro Ethernet Forum is a port level point-to-point or multipoint-to-multipoint Layer 2 circuit. EVC status can be used by a CE device to find an alternative path into the service provider network or in some cases, fall back to a backup path over Ethernet or over another alternative service such as Frame Relay or ATM.

Ethernet LMI

Ethernet LMI is an Ethernet Operations, Administration, and Maintenance (OAM) protocol between a CE device and a Provider Edge (PE) device. Ethernet LMI provides information that enables autoconfiguration of CE devices and provides the status of EVCs for large Ethernet metropolitan area networks (MANs) and WANs. Specifically, Ethernet LMI runs only on the PE-CE user network interface (UNI) link and notifies a CE device of both the operating state of an EVC and the time when an EVC is added or deleted. Ethernet LMI also communicates the attributes of an EVC.

Ethernet LMI interoperates with Ethernet Connectivity Fault Management (CFM) and LDP. In this case Ethernet LMI relies on the OAM manager to interwork with LDP to report remote link status to the local CE.

OAM Manager

The OAM manager is an infrastructure element that streamlines interaction between OAM protocols. The OAM manager requires two interworking OAM protocols, in this case Ethernet LMI and MPLS LDP.

No interactions are required between Ethernet LMI and the OAM manager on the CE side. On the user-facing provider edge (UPE) side, the OAM manager defines an abstraction layer that relays data collected from Ethernet CFM to the Ethernet LMI device.

Ethernet LMI and OAM manager interaction is unidirectional, from the OAM manager to Ethernet LMI on the UPE side of the device. An information exchange results from an Ethernet LMI request or is triggered by the OAM manager when the OAM manager receives notification from the OAM protocol that the EVC status has changed. In this case, the change is called a remote link status change.

Benefits of Remote Port Shutdown

The Remote Port Shutdown feature provides direct interaction of Ethernet LMI with MPLS, LDP, and OAM. When CFM/802.1ag is not running in a network, Remote Port Shutdown enables communication of link status to a CE, and traffic from the CE can be stopped if MPLS or the pseudowire is down. Figure 1 shows an EoMPLS network with the remote link down.

Figure 1 EoMPLS Network With the Remote PE-CE Link Down

How to Configure Remote Port Shutdown

Perform the following tasks to configure the Remote Port Shutdown feature:

•Specifying LDP as an OAM Protocol

Specifying LDP as an OAM Protocol

Perform this task to specify LDP as an OAM protocol.

SUMMARY STEPS

1. enable

2. configure terminal

3. ethernet evc evc-id

4. oam protocol {cfm slvan slvan-id domain domain-name | ldp}

5. end

DETAILED STEPS

 
Command or Action
Purpose

Step 1 

enable

Example:

Router> enable

Enables privileged EXEC mode.

•Enter your password if prompted.

Step 2 

configure terminal

Example:

Router# configure terminal

Enters global configuration mode.

Step 3 

ethernet evc evc-id

Example:

Router(config)# ethernet evc evc10

Defines an EVC and enters EVC configuration mode.

Step 4 

oam protocol {cfm slvan slvan-id domain domain-name | ldp}

Example:

Router(config-evc)# oam protocol ldp

Configures either CFM or LDP as an OAM protocol.

•In this example, LDP is the protocol being configured.

Step 5 

end

Example:

Router(config-evc)# end

Returns the CLI to privileged EXEC mode.

Configuration Examples for Remote Port Shutdown

This section provides the following configuration example:

•Specifying LDP As the OAM Protocol and Associating a Service Instance to an EVC: Example

•Configuring Xconnect Directly on an Interface: Example

Specifying LDP As the OAM Protocol and Associating a Service Instance to an EVC: Example

In this example, the OAM protocol for EVC pw_evc is specified as LDP, and service instance 1 is associated with the EVC. 

Router(config)# ethernet evc pw_evc

Router(config-evc)# oam protocol ldp 

Router(config-evc)# uni count 2

Router(config-evc)# exit

Router(config)# pseudowire-class vlan-xconnect

Router(config-pw-class)# encapsulation mpls

Router(config-pw-class)# interworking

Router(config-pw-class)# exit


Router(config)# interface ethernet 0/0

Router(config-if)# ethernet lmi interface

Router(config-if)# ethernet uni id ce1

Router(config-if)# service instance 1 ethernet pw_evc

Router(config-if-srv)# encapsulation dot1q 2

Router(config-if-srv)# xconnect10.2.2.2 123 pw-class vlan-xconnect

Router(config_if-srv)# exit

Configuring Xconnect Directly on an Interface: Example

In this example, Xconnect is configured directly on an interface. 

Router(config)# interface ethernet 0/0

Router(config-if)# xconnect 2.2.2.2 123 pw-class vlan-xconnect

Router(config-if)# ethernet lmi interface

Router(config-if)# ethernet uni id ce1

Router(config-if)# service instance 1 ethernet pw_evc

Router(config-if-srv)# encapsulation dot1q 2

Router(config_if-srv)# exit

Additional References

The following sections provide references related to the Remote Port Shutdown feature.

Related Documents


Standards

Standard
Title

IEEE P802.1ag/D5.2

Draft Standard for Local and Metropolitan Area Networks

IETF VPLS OAM

L2VPN OAM Requirements and Framework

ITU-T

ITU-T Y.1731 OAM Mechanisms for Ethernet-Based Networks

ITU-T Q.3/13

Liaison statement on Ethernet OAM (Y.17ethoam)

Metro Ethernet Forum 16 Technical Specification

Technical Specification MEF 16-Ethernet Local Management Interface


MIBs

MIB
MIBs Link

No new or modified MIBs are supported by this feature, and support for existing MIBs has not been modified by this feature.

To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at the following URL:

http://www.cisco.com/go/mibs


RFCs

RFC
Title

No new or modified RFCs are supported by this feature, and support for existing RFCs has not been modified by this feature.

—


Technical Assistance

Description
Link

The Cisco Support website provides extensive online resources, including documentation and tools for troubleshooting and resolving technical issues with Cisco products and technologies. Access to most tools on the Cisco Support website requires a Cisco.com user ID and password. If you have a valid service contract but do not have a user ID or password, you can register on Cisco.com.

http://www.cisco.com/techsupport


Command Reference

This section documents only commands that are new or modified.

•oam protocol

oam protocol

To specify an operations, maintenance, and administration (OAM) protocol, use the oam protocol command in Ethernet virtual connection (EVC) configuration mode. To remove an OAM protocol, use the no form of this command.

oam protocol {cfm slvan svlan-id domain domain-name | ldp}

no oam protocol

Syntax Description

cfm

Specifies Connectivity Fault Management (CFM) as the protocol.

svlan

Specifies a service provider VLAN.

svlan-id

Integer in the range of 1 to 4094 that identifies the service provider VLAN.

domain

Specifies a CFM maintenance domain.

domain-name

String of a maximum of 256 characters that identifies the domain.

ldp

Specifies Lightweight Directory Protocol (LDP).


Command Default

An OAM protocol is not specified.

Command Modes

EVC configuration

Command History

Release
Modification

12.2(33)SRB

This command was introduced.


Usage Guidelines

Use this command to specify the OAM protocol to use for communicating link status in an Ethernet over Multiprotocol Label Switching (EoMPLS) network.

Examples

The following example shows how to specify LDP as the OAM protocol: 

Router(config)# ethernet evc evc10

Router(config-evc)# oam protocol ldp

Feature Information for Remote Port Shutdown

Table 1 lists the release history for this feature.

Not all commands may be available in your Cisco IOS software release. For release information about a specific command, see the command reference documentation.

Use Cisco Feature Navigator to find information about platform support and software image support. Cisco Feature Navigator enables you to determine which Cisco IOS and Catalyst OS software images support a specific software release, feature set, or platform. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.

Note Table 1 lists only the Cisco IOS software release that introduced support for a given feature in a given Cisco IOS software release train. Unless noted otherwise, subsequent releases of that Cisco IOS software release train also support that feature.

Table 1 Feature Information for Remote Port Shutdown 

Feature Name
Releases
Feature Information

Remote Port Shutdown

12.2(33)SRB

The Remote Port Shutdown feature uses Ethernet LMI in an EoMPLS network to propagate remote link status to a CE device.

In Release 12.2(33)SRB, this feature was implemented on the Cisco 7600 router.

The oam protocol command was introduced in this feature.



Any Internet Protocol (IP) addresses used in this document are not intended to be actual addresses. Any examples, command display output, and figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses in illustrative content is unintentional and coincidental.

©2007 Cisco Systems, Inc. All rights reserved.