Vpls Packet Walkthrough; Figure 34: Vpls Service Architecture; Figure 35: Access Port Ingress Packet Format And Lookup - Alcatel-Lucent 7750 SR OS Service Manual

VPLS Packet Walkthrough

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