Alcatel-Lucent 7750 SR OS - Virtual Private LAN Service; VPLS Packet Walkthrough; Figure 34: VPLS Service Architecture; Figure 35: Access Port Ingress Packet Format and Lookup

Virtual Private LAN Services
7750 SR OS Services Guide Page 327
VPLS Packet Walkthrough
This section provides an example of VPLS processing of a customer packet sent across the
network (Figure 34) from site-A, which is connected to PE-Router-A, to site-B, which is
connected to PE-Router-C (Figure 35).
Figure 2: VPLS Service Architecture
1. PE-Router-A (Figure 35)
a. Service packets arriving at PE-Router-A are associated with a VPLS service instance based
on the combination of the physical port and the IEEE 802.1Q tag (VLAN-ID) in the packet.
Figure 3: Access Port Ingress Packet Format and Lookup
b. PE-Router-A learns the source MAC address in the packet and creates an entry in the FIB
PE A
PE C
PE D
IP / MPLS
Network
LSP Full-Mesh
VPLS Service1
VPLS Service2
B
B
B
B
B
B
PE B
B
VIRTUAL
BRIDGE
PE A
PE C
PE D
IP / MPLS
Network
LSP Full-Mesh
VPLS Service1
VPLS Service2
B
B
B
B
B
B
PE B
B
VIRTUAL
BRIDGE
Customer
Location A
IP/MPLS NETWORK
PE A
Ingress look-up based on
access port or port/VLAN-ID
Customer
Packet
B
VLAN
ID
Src
MAC
Dest
MAC
Customer
Location A
IP/MPLS NETWORK
PE A
Ingress look-up based on
access port or port/VLAN-ID
Customer
Packet
B
VLAN
ID
Src
MAC
Dest
MAC