Bridging on Ethernet Flow Points: Example
This example shows how to configure a to perform Layer 2 switching on traffic that passes through Ethernet
Flow Points (EFPs). EFP traffic typically has one or more VLAN headers. Although both IOS XR trunks and
IOS XR EFPs can be combined as attachment circuits in bridge domains, this example uses EFPs exclusively.
Important notes:
• An EFP is a Layer 2 subinterface. It is always created under a trunk interface. The trunk interface must
exist before the EFP is created.
• In an empty configuration, the bundle interface trunk does not exist, but the physical trunk interfaces are
automatically configured. Therefore, only the bundle trunk is created.
• In this example the subinterface number and the VLAN IDs are identical, but this is out of convenience,
and is not a necessity. They do not need to be the same values.
• The bridge domain test-efp has three attachment circuits (ACs). All the ACs are EFPs.
• Only frames with a VLAN ID of 999 enter the EFPs. This ensures that all the traffic in this bridge domain
has the same VLAN encapsulation.
• The ACs in this example use interfaces that are in the admin down state (unresolved state). Bridge
domains that use nonexistent interfaces as ACs are legal, and the commit for such configurations does
not fail. In this case, the status of the bridge domain shows unresolved until you configure the missing
interface.
Configuration Example
RP/0/RSP1/CPU0:router#configure
RP/0/RSP1/CPU0:router(config)#interface Bundle-ether10
RP/0/RSP1/CPU0:router(config-if)#interface Bundle-ether10.999 l2transport
RP/0/RSP1/CPU0:router(config-subif)#encapsulation dot1q 999
RP/0/RSP1/CPU0:router(config-subif)#interface GigabitEthernet0/6/0/5
RP/0/RSP1/CPU0:router(config-if)#bundle id 10 mode active
RP/0/RSP1/CPU0:router(config-if)#interface GigabitEthernet0/6/0/6
RP/0/RSP1/CPU0:router(config-if)#bundle id 10 mode active
RP/0/RSP1/CPU0:router(config-if)#interface GigabitEthernet0/6/0/7.999 l2transport
RP/0/RSP1/CPU0:router(config-subif)#encapsulation dot1q 999
RP/0/RSP1/CPU0:router(config-subif)#interface TenGigE0/1/0/2.999 l2transport
RP/0/RSP1/CPU0:router(config-subif)#encapsulation dot1q 999
RP/0/RSP1/CPU0:router(config-subif)#l2vpn
RP/0/RSP1/CPU0:router(config-l2vpn)#bridge group examples
RP/0/RSP1/CPU0:router(config-l2vpn-bg)#bridge-domain test-efp
RP/0/RSP1/CPU0:router(config-l2vpn-bg-bd)#interface Bundle-ether10.999
RP/0/RSP1/CPU0:router(config-l2vpn-bg-bd-ac)#exit
RP/0/RSP1/CPU0:router(config-l2vpn-bg-bd)#interface GigabitEthernet0/6/0/7.999
RP/0/RSP1/CPU0:router(config-l2vpn-bg-bd-ac)#exit
RP/0/RSP1/CPU0:router(config-l2vpn-bg-bd)#interface TenGigE0/1/0/2.999
RP/0/RSP1/CPU0:router(config-l2vpn-bg-bd-ac)#commit
RP/0/RSP1/CPU0:router(config-l2vpn-bg-bd-ac)#end
RP/0/RSP1/CPU0:router#
RP/0/RSP1/CPU0:router#show l2vpn bridge group examples
Fri Jul 23 21:56:34.473 UTC Bridge group: examples, bridge-domain: test-efp, id: 0, state:
up, ShgId: 0, MSTi: 0
Aging: 300 s, MAC limit: 4000, Action: none, Notification: syslog
Filter MAC addresses: 0
ACs: 3 (0 up), VFIs: 0, PWs: 0 (0 up), PBBs: 0 (0 up)
List of ACs:
BE10.999, state: down, Static MAC addresses: 0
L2VPN and Ethernet Services Configuration Guide for Cisco ASR 9000 Series Routers, IOS XR Release 6.3.x
331
Implementing Multipoint Layer 2 Services
Bridging on Ethernet Flow Points: Example
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