Understanding Evc Features; Ethernet Virtual Connections; Service Instances And Efps - Cisco 3845 - Security Bundle Router Software Manual

Chapter 11 Configuring Ethernet Virtual Connections (EVCs)

Understanding EVC Features

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Ethernet Virtual Connections

You use the ethernet evc evc-id global configuration command to create an Ethernet virtual connection
(EVC). The evc-id or name is a text string from 1 to 100 bytes. Entering this command puts the device
into service configuration mode (config-srv) where you configure all parameters that are common to an
EVC.
In this mode you can enter these commands:
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Service Instances and EFPs

Configuring a service instance on a Layer 2 port or EtherChannel creates a pseudoport or Ethernet flow
point (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 have defined an EVC by entering the ethernet evc evc-id global 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.
Use the service instance number ethernet [name] interface configuration command to create an EFP on
a Layer 2 interface or EtherChannel and to enter service instance configuration mode. You use service
instance configuration mode to configure all management and control date plane attributes and
parameters that apply to the service instance on a per-interface basis.
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OL-23400-01
Ethernet Virtual Connections, page 11-3
Service Instances and EFPs, page 11-3
Encapsulation, page 11-4
Bridge Domains, page 11-6
Configuring Other Features on EFPs, page 11-15
Rewrite Operations, page 11-7
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
The service instance number is the EFP identifier, an integer from 1 to 4000.
The optional ethernet name is the name of a previously configured EVC. You do not need to enter
an EVC name, but you must enter ethernet. Different EFPs can share the same name when they
correspond to the same EVC. EFPs are tied to a global EVC through the common name.
Cisco ME 3800X and 3600X Switch Software Configuration Guide
Understanding EVC Features
11-3