CHAPTER
19-1
Software Configuration Guide—Release IOS XE 3.6.0E and IOS 15.2(2)SG
OL-30933-01
19
Configuring EVC-Lite
This document describes how to configure EVC-Lite, which is a lite version of the Ethernet Virtual
Connections (EVC) feature on Supervisor Engine 7L-E. The associated command pages are also
provided.
The document details:
• About EVC-Lite, page 19-1
• How to Configure EVC-Lite, page 19-1
About EVC-Lite
Ethernet virtual circuits (EVCs) define a Layer 2 bridging architecture that supports Ethernet services.
An EVC is defined by the Metro-Ethernet Forum (MEF) as an association between two or more user
network interfaces that identifies a point-to-point or multipoint-to-multipoint path within the service
provider network. An EVC is a conceptual service pipe within the service provider network. A bridge
domain is a local broadcast domain that exists separately from VLANs.
A Catalyst 4500 series switch comprises of two bridge domains (BDs), BD 0 and BD 1. By default, all
ports belong to BD 0 and you can move them to BD 1 manually.
EVC-Lite supports 8K VLANs using the existing support of 8K Internal VLANs, segregated under the
two BDs, where each BD has its own representation of 4K VLANs.
A system can have two types of VLAN's: EVC-Lite and non EVC-Lite (the default). Ordinary VLANs
are VLANs without awareness of any BDs (the situation that exists when the feature is not enabled).
EVC-Lite VLANs are treated differently in different bridge domains (e.g the same VLAN 2 is treated
differently in BD 0 and BD 1).
A port can support both EVC-Lite and non EVC-Lite VLANs. EVC-Lite VLANs that are part of BD 1
are mapped to an internal VLAN ID as VLAN ID + 4096. Remaining VLANs are not mapped internally.
How to Configure EVC-Lite
Step 1 Create a VLAN:
Switch# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)# vlan vlan-ID
Switch(config-vlan)# exit
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