VPLS

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