Cisco ASR 903 Guide

Layer 2 Solution
▀ Ethernet Flow Point (EFP)
▄ Cisco ASR 903 Router Design and Deployment Guide
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OL-30526-01
Chapter 2 Layer 2 Solution
Ethernet Flow Point (EFP)
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 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. EFP is the building block for Ethernet Virtual Circuit, bridged EVC hop-by-hop,
EoMPLS or VPLS. An EFP can be viewed as switch access port but more powerful as it can manipulate the frames
by removing and imposing vlan tags. The following EFP matches incoming dot1q vlan 10, removes the vlan tag
and forwards into bridge-domain 10. On egress direction, a frame will be imposed vlan 10 before sending out on
the wire.
interface GigabitEthernet0/2/0
service instance 2 ethernet
encapsulation dot1q 10
rewrite ingress tag pop 1 symmetric
bridge-domain 10
Alternatively with new CLI, the above can also be configured as below. Note that the bridge-domain does not have
to be same as vlan tag and it has been purposely changed to 30 in the following example.
bridge-domain 30
member GigabitEthernet0/2/0 service-instance 2
interface GigabitEthernet0/2/0
service instance 2 ethernet
encapsulation dot1q 10
rewrite ingress tag pop 1 symmetric
Table 1. Encapsulation types
Encapsulation
Description
encapsulation untagged
Native Packets
encapsulation default
Catch-all Encap.
encasulationp priority-tagged
Dot1p Packets.
encapsulation dot1q any
All packets with one or more vlans
encapsulation dot1q vlan
Exact Outermost match.
encapsulation dot1q vlan (second-)dot1q vlan2
Exact Outermost two tags.
encapsulation dot1q range
Ranged Outermost match.
encapsulation dot1q range (second-)dot1q vlan2
Ranged Outermost match, exact second tag
encapsulation dot1q range (second-)dot1q range
Ranged Outermost two tags.
encapsulation dot1q vlan (second-)dot1q range
Exact Outermost match, ranged second tag
encapsulation dot1q vlan cos cos
Exact Outermost vlan, cos match.
encapsulation dot1q range cos cos (second-)dot1q range cos cos
Ranged combinations of outermost vlan and second tag

Cisco ASR 903 Specifications

General

Brand	Cisco
Model	ASR 903
Category	Network Router
Language	English