In a PBB over VPLS network, traffic between the PE devices flows over MPLS pseudo-wires that connect
all the PE devices in a full mesh network topology.
Provider Back Bone Network Topology figure illustrates a typical 802.1ah PBB network.
For every I-SID (Service Instance VLAN ID) there is a corresponding multicast MAC address called the
group B-MAC address, which is derived based on the I-SID. The group B-MAC address is used as the
destination address in the outer MAC header when propagating flooded traffic across the provider backbone.
The MMRP is used by the PE devices to inform each other about the set of group B-MAC addresses
corresponding to the I-SIDs of the service instances they host. This enables each device to determine which
set of pseudo-wires flooded traffic should be forwarded on, that is, those pseudo-wires on which an MMRP
registration has been received for the group B-MAC address corresponding to the I-SID.
The PBB-VPLS flood optimization feature is enabled only on PBB-VPLS network and not on PBB over
Ethernet network.
Note
Configuring PBB-VPLS Flood Optimization
To configure the PBB-VPLS flood optimization feature, do the following:
Enabling PBB-VPLS Flood Optimization on PBB Core Bridge
Perform this task to enable PBB-VPLS flood optimization on PBB core bridge.
SUMMARY STEPS
1. configure
2. l2vpn
3. bridge group bridge-group-name
4. bridge-domain domain-name
5. pbb core
6. mmrp-flood-optimization
7. Use the commit or end command.
DETAILED STEPS
Step 1 configure
Example:
RP/0/RSP0/CPU0:router# configure
Enters Global Configuration mode.
Step 2 l2vpn
Example:
L2VPN and Ethernet Services Configuration Guide for Cisco ASR 9000 Series Routers, IOS XR Release 6.3.x
367
Implementing IEEE 802.1ah Provider Backbone Bridge
Configuring PBB-VPLS Flood Optimization
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