HP 10500 Series Configuration Manual page 272

If the source MAC address of a packet from a CE does not exist in the MAC address table, the PE
learns the source MAC address on the AC connected to the CE.
• Learning the source MAC addresses of remote sites connected through PWs
A VSI regards a PW as a logical Ethernet interface. If the source MAC address of a packet
received from a PW does not exist in the MAC address table, the PE learns the source MAC
address on the PW of the VSI.
Figure 72 Source MAC address learning on a PE
If no packet is received from a MAC address before the aging timer expires, VPLS deletes the MAC
address to save MAC address table resources.
When an AC or a PW goes down, the PE deletes MAC addresses on the AC or PW and sends an LDP
address withdrawal message to notify all other PEs in the VPLS instance to delete those MAC addresses
for fast convergence of the MAC address table.
Traffic fowarding and flooding
Unicast traffic forwarding and flooding:
After a PE receives a unicast packet from an AC, the PE searches the MAC address table of the VSI bound
to the AC to determine how to forward this packet.
• If a match is found, the PE forwards the packet according to the matching entry. If the outgoing
interface in the entry is a PW, the PE inserts the PW label to the packet, adds the public tunnel
header to the packet, and then forwards the packet to the remote PE over the PW. If the outgoing
interface in the entry is a local interface, the PE directly forwards the packet to the local interface.
If no match is found, the PE floods the packet to all other ACs and PWs in the VSI.
•
266