CHAPTER 2
Ethernet Virtual Connections Configuration
An Ethernet Virtual Connection (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 is VLAN-ID-agnostic. An Ethernet flow point (EFP)
service instance is a logical interface that connects a bridge domain to a physical port or to an EtherChannel
group.
An EVC broadcast domain is determined by a bridge domain and the EFPs that are connected to it. You can
connect multiple EFPs to the same bridge domain on the same physical interface, and each EFP can have
its own matching criteria and rewrite operation. An incoming frame is matched against EFP matching criteria
on the interface, learned on the matching EFP, and forwarded to one or more EFPs in the bridge domain. If
there are no matching EFPs, the frame is dropped.
You can use EFPs to configure VLAN translation. For example, if there are two EFPs egressing the same
interface, each EFP can have a different VLAN rewrite operation, which is more flexible than the traditional
switchport VLAN translation model.
Effective Cisco IOS-XE Release 3.15.0S, QoS policies on EFPs are now supported with ingress rewrite type
as push. In the ingress direction with one VLAN tag is pushed and in the egress direction one VLAN tag is
popped.
This document describes how to configure EVC features.
For detailed information about the commands, see:
• the Cisco IOS XE 3S Carrier Ethernet Command Reference: http://www.cisco.com/en/US/docs/ios/
cether/command/reference/ce_book.html
• Master Command Index for Cisco IOS XE Release 3S: http://www.cisco.com/en/US/docs/ios/mcl/
allreleasemcl/all_book.html
•
Finding Feature Information, page 12
•
Supported EVC Features, page 12
•
Restrictions for Ethernet Virtual Connections Configuration, page 13
•
Ethernet Virtual Connections, page 14
•
Configuring EFPs, page 20
•
Configuring Other Features on EFPs, page 29
Carrier Ethernet Configuration Guide (Cisco ASR 920 Series)
11
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