Table Of Contents
Configuring Remote Port Shutdown
Prerequisites for Configuring Remote Port Shutdown
Restrictions for Configuring Remote Port Shutdown
Information About Configuring Remote Port Shutdown
Benefits of Remote Port Shutdown
How to Configure Remote Port Shutdown
Specifying LDP as an OAM Protocol
Configuration Examples for Remote Port Shutdown
Example: Specifying LDP As the OAM Protocol and Associating a Service Instance to an EVC
Example: Configuring Xconnect Directly on an Interface
Feature Information for Configuring Remote Port Shutdown
Configuring Remote Port Shutdown
First Published: February 27, 2007Last Updated: February 6, 2011The 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 feature information and caveats, see 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 for Configuring Remote Port Shutdown" section.
Use Cisco Feature Navigator to find information about platform support and Cisco 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
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Prerequisites for Configuring Remote Port Shutdown
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Restrictions for Configuring Remote Port Shutdown
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Information About Configuring Remote Port Shutdown
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How to Configure Remote Port Shutdown
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Configuration Examples for Remote Port Shutdown
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Feature Information for Configuring Remote Port Shutdown
Prerequisites for Configuring Remote Port Shutdown
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Ethernet LMI must be enabled for the Remote Port Shutdown feature to function.
Restrictions for Configuring Remote Port Shutdown
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Connectivity Fault Management and Lightweight Directory Protocol (LDP) cannot be configured at the same time.
Information About Configuring Remote Port Shutdown
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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
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How to Configure Remote Port Shutdown
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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 svlan svlan-id domain domain-name | ldp}
5.
end
DETAILED STEPS
Configuration Examples for Remote Port Shutdown
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Example: Specifying LDP As the OAM Protocol and Associating a Service Instance to an EVC
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Example: Configuring Xconnect Directly on an Interface
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_evcRouter(config-evc)# oam protocol ldpRouter(config-evc)# uni count 2Router(config-evc)# exitRouter(config)# pseudowire-class vlan-xconnectRouter(config-pw-class)# encapsulation mplsRouter(config-pw-class)# interworkingRouter(config-pw-class)# exitRouter(config)# interface ethernet 0/0Router(config-if)# ethernet lmi interfaceRouter(config-if)# ethernet uni id ce1Router(config-if)# service instance 1 ethernet pw_evcRouter(config-if-srv)# encapsulation dot1q 2Router(config-if-srv)# xconnect10.2.2.2 123 pw-class vlan-xconnectRouter(config_if-srv)# exitExample: Configuring Xconnect Directly on an Interface
In this example, Xconnect is configured directly on an interface.
Router(config)# interface ethernet 0/0Router(config-if)# xconnect 2.2.2.2 123 pw-class vlan-xconnectRouter(config-if)# ethernet lmi interfaceRouter(config-if)# ethernet uni id ce1Router(config-if)# service instance 1 ethernet pw_evcRouter(config-if-srv)# encapsulation dot1q 2Router(config_if-srv)# exitAdditional References
Related Documents
Related Topic Document TitleEthernet CFM
"Configuring Ethernet Connectivity Fault Management in a Service Provider Network" in the Cisco IOS Carrier Ethernet Configuration Guide
Ethernet LMI
"Configuring Ethernet Local Management Interface" in the Cisco IOS Carrier Ethernet Configuration Guide
Configuring Ethernet LMI on a PE device
"Configuring Ethernet Local Management Interface at a Provider Edge" in the Cisco IOS Carrier Ethernet Configuration Guide
Ethernet over MPLS
Ethernet over MPLS for the Cisco 7600 Series Internet Routers
Cisco IOS commands: master list of commands with complete command syntax, command mode, command history, defaults, usage guidelines, and examples
Cisco IOS Carrier Ethernet commands: complete command syntax, command mode, command history, defaults, usage guidelines, and examples
Standards
MIBs
RFCs
RFC TitleNo new or modified RFCs are supported by this feature, and support for existing RFCs has not been modified by this feature.
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Technical Assistance
Feature Information for Configuring Remote Port Shutdown
Table 1 lists the release history for this feature.
Use Cisco Feature Navigator to find information about platform support and software image support. Cisco Feature Navigator enables you to determine which 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.
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Note
Table 1 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.
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