Dual Homing To A Vpls Service; Figure 73: Dual Homed Ce Connection To Vpls - Alcatel-Lucent 7750 SR Manual

Dual Homing to a VPLS Service

Figure 73
operation in case of link failure (between PE-C and L2-B). Upon detection of a link failure PE-C
will send MAC-Address-Withdraw messages, which will indicate to all LDP peers that they
should flush all MAC addresses learned from PE-C. This will lead that to a broadcasting of
packets addressing affected hosts and re-learning process in case an alternative route exists.
Note that the message described here is different than the message described in draft-ietf-l2vpn-
vpls-ldp-xx.txt, Virtual Private LAN Services over MPLS. The difference is in the interpretation
and action performed in the receiving PE. According the draft definition, upon receipt of a MAC-
withdraw message, all MAC addresses, except the ones learned from the source PE, are flushed,
This section specifies that all MAC addresses learned from the source are flushed. This message
has been implemented as an LDP address message with vendor-specific type, length, value (TLV),
and is called the flush-all-from-ME message.
7750 SR OS Services Guide
PE-A
L2-A
PE-B
PE-A
L2-A
PE-B
PE-A
L2-A
PE-B
PE-A
L2-A
PE-B

Figure 73: Dual Homed CE Connection to VPLS

illustrates a dual-homed connection to VPLS service (PE-A, PE-B, PE-C, PE-D) and
Virtual Private LAN Services
PE-C
L2-B
PE-D
MAC flush
Link down
PE-C
L2-B
PE-D
PE-C
L2-B
PE-D
PE-C
L2-B
PE-D
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