Cisco Systems A9014CFD manual Understanding EVC Features, Ethernet Virtual Connections

Chapter 8 Configuring Ethernet Virtual Connections

Understanding EVC Features

These Layer 2 port-based features can run with EVC configured on the port:

•LACP

•CDP

•MSTP

Understanding EVC Features

This section contains the following topics:

•Ethernet Virtual Connections, page 8-3

•Service Instances and EFPs, page 8-3

•Encapsulation, page 8-4

•Bridge Domains, page 8-5

•DHCP Client on Switch Virtual Interface

•Configuring Other Features on EFPs, page 8-16

•Rewrite Operations, page 8-6

Ethernet Virtual Connections

Use the ethernet evc evc-idglobal configuration command to create an EVC. The evc-idor name is a text string from 1 to 100 bytes. Using this command moves the device into service configuration mode (config-srv) where you configure all parameters that are common to an EVC.

In this mode you can use these commands:

•default—Sets a command to its defaults

•exit—Exits EVC configuration mode

•no— Negates a command or sets its defaults

•oam—Specifies the OAM Protocol

•uni—Configures a count UNI under EVC

Service Instances and EFPs

Configuring a service instance on a Layer 2 port or EtherChannel creates an EFP on which you configure EVC features. Each service instance has a unique number per interface, but you can use the same number on different interfaces because service instances on different ports are not related.

If you defined an EVC by using the ethernet evc evc-idglobal configuration command, you can associate the EVC with the service instance (optional). There is no default behavior for a service instance. You can configure a service instance only on trunk ports with no allowed VLANs. Any other configuration is not allowed. After you have configured a service instance on an interface, switchport commands are not allowed on the interface. You can also configure a service instance on an EtherChannel group.

Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide

OL-23826-09 8-3