Carrier Ethernet Configuration Guide, Cisco IOS Release 15S
Configuring Remote Port Shutdown
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Configuring Remote Port Shutdown

Configuring Remote Port Shutdown

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

Your software release may not support all the features documented in this module. For the latest caveats and feature information, see Bug Search Tool and the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the feature information table at the end of this module.

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

Prerequisites for Configuring Remote Port Shutdown

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

Restrictions for Configuring Remote Port Shutdown

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

Information About Configuring 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. The figure below shows an EoMPLS network with the remote link down.



How to Configure Remote Port Shutdown

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 svlan svlan-id domain domain-name| ldp}

    5.    end


DETAILED STEPS
     Command or ActionPurpose
    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 svlan svlan-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

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

    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
    

    Example Configuring Xconnect Directly on an Interface

    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

    Related Documents

    Related Topic

    Document Title

    Cisco IOS commands: master list of commands with complete command syntax, command mode, command history, defaults, usage guidelines, and examples

    Cisco IOS Master Commands List, All Releases

    Cisco IOS Carrier Ethernet commands: complete command syntax, command mode, command history, defaults, usage guidelines, and examples

    Cisco IOS Carrier Ethernet Command Reference

    Standards

    Standard

    Title

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

    --

    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 software 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 and Documentation website provides online resources to download documentation, software, and tools. Use these resources to install and configure the software and to troubleshoot and resolve technical issues with Cisco products and technologies. Access to most tools on the Cisco Support and Documentation website requires a Cisco.com user ID and password.

    http:/​/​www.cisco.com/​cisco/​web/​support/​index.html

    Feature Information for Configuring Remote Port Shutdown

    The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.

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

    Table 1 Feature Information for Configuring 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 following commands were introduced or modified: oam protocol.