VPLS
One or more emulated LANs can be created for each customer.
- Each emulated LAN looks like a giant Ethernet switch to the customer.
- Each emulated LAN is completed separate from others
- For each LAN, the PE routers have a full mesh of PW
When the PE receives a frame, it inspects the DMAC to forward it to the correct egress PE, similar to a regular switch.
- Initial traffic is sent to all PWs
- MAC addresses are learned based on the SMAC
- SMAC is mapped to the arriving interface - physical or PW
- Further traffic is just sent to the appropriate egress PE
- Split-horizon is used to prevent loops
- Broadcast and Multicast are handled like a traditional switch
CE can be a switch or a router.
A router is recommended in large environments, as it prevents a large number of MAC addresses from needing to be learned on the PEs
int g3
service instance 100 ethernet
encap dot1q 100
l2vpn vfi conext vfi100
vpn id 100
member 10.5.5.5 encap mpls
bridge-domain 100
member g3 service-instace 100
member vfi vfi100
show bridge-domain
show l2vpn vfi
show l2vpn service vfi name vfi100
show ether service instance id 100 interface g3 detail