Chapter 2 Layer 2 Solution; Ethernet Flow Point (Efp) - Cisco ASR 903 Manual

▀ Ethernet Flow Point (EFP)

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
Encapsulation
encapsulation untagged
encapsulation default
encasulationp priority-tagged
encapsulation dot1q any
encapsulation dot1q vlan
encapsulation dot1q vlan (second-)dot1q vlan2
encapsulation dot1q range
encapsulation dot1q range (second-)dot1q vlan2
encapsulation dot1q range (second-)dot1q range
encapsulation dot1q vlan (second-)dot1q range
encapsulation dot1q vlan cos cos
encapsulation dot1q range cos cos (second-)dot1q range cos cos
▄ Cisco ASR 903 Router Design and Deployment Guide
8
Table 1. Encapsulation types
Description
Native Packets
Catch-all Encap.
Dot1p Packets.
All packets with one or more vlans
Exact Outermost match.
Exact Outermost two tags.
Ranged Outermost match.
Ranged Outermost match, exact second tag
Ranged Outermost two tags.
Exact Outermost match, ranged second tag
Exact Outermost vlan, cos match.
Ranged combinations of outermost vlan and second tag
Layer 2 Solution
OL-30526-01