Alcatel-Lucent 7750 SR - Figure 68: MAC Flush in the MC-EP Solution

Page 464 7750 SR OS Services Guide
Figure 68: MAC Flush in the MC-EP Solution
Regular MAC flush behavior will apply for the LDP MAC withdraw sent over the T-LDP Sessions
associated with the active pseudowire in the MC-EP, for example PE3 to PE1. That is for any TCN
events or failures associated with SAPs or pseudowires not associated with the MC-EP.
The following MAC flush behaviors apply to changes in the MC-EP pseudowire selection:
• If the local PW2 becomes active on PE3:
→ On PE3 the MACs mapped to PW1 are moved to PW2.
→ A T-LDP “flush-all-but-mine” message is sent toward PE2 in F2 direction and is
propagated by PE2 in the local VPLS mesh.
→ No MAC flush is sent to F1 direction from PE3.
• If one of the pseudowires on the pair PE3 becomes active, for example PW4:
→ On PE3, the MACs mapped to PW1 are flushed, same as a regular endpoint.
→ PE3 must be configured with send-flush-on-failure to send a T-LDP “flush-all-from-
me” message towards VPLS mesh in the F1 direction.
→ PE3 sends a T-LDP “flush-all-but-mine” messagent towards PE2 in the F2 direction
which is propagated by PE2 in the local VPLS mesh. Note that when MC-EP is in
passive mode and the first spoke becomes active, no MAC flush-all-but-mine will be
generated.
OSSG252
Domain2Domain1
Resilient Inter-domain
Handoff
VPLS
(Mesh)
VPLS
(Mesh)
PE3
PE3’
PE1
PE2
MC
EP
PW1
PW2
PW3
PW4
Active PW
Standby PWs
F2
F1