VPLS Service Overview
b. 7210-A learns the source MAC address in the packet and creates an entry in the FIB table
c. The destination MAC address in the packet is looked up in the FIB table for the VPLS in-
d. If the destination MAC address has already been learned by 7210, an existing entry in the
e. The customer packet is sent on this LSP once the IEEE 802.1Q tag is stripped and the ser-
f.
2. Core Router Switching
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Customer
Location A
7210-A
Dest
Src
VLAN
MAC
MAC
ID
Customer Payload
Figure 36: Access Port Ingress Packet Format and Lookup
that associates the MAC address to the service access point (SAP) on which it was received.
stance. There are two possibilities: either the destination MAC address has already been
learned (known MAC address) or the destination MAC address is not yet learned (unknown
MAC address).
For a Known MAC Address
FIB table identifies the far-end PE-Router and the service VC-label (inner label) to be used
before sending the packet to PE-Router-A.
vice VC-label (inner label) and the transport label (outer label) are added to the packet.
For an Unknown MAC Address
If the destination MAC address has not been learned, 7210 will flood the packet to spoke
SDPs that are participating in the service.
Customer
Location C
7210-C
Uplink Q-tags
DST
SRC
MAC
MAC
Figure 37: Network Port Egress Packet Format and Flooding
PE A
IP/MPLS Network
Payload
(Figure
37):
(Figure
37):
PE C
Customer
Q-tag
Q-tag
Packet
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OSSG 7210M
7210 SAS M Services Guide