Alcatel-Lucent 7750 SR - MAC Flush; PBB Resiliency for B-VPLS over Pseudowire Infrastructure

Virtual Private LAN Services
7750 SR OS Services Guide Page 793
MAC Flush
PBB Resiliency for B-VPLS Over Pseudowire Infrastructure
The following VPLS resiliency mechanisms are also supported in PBB VPLS:
• Native Ethernet resiliency supported in both I-VPLS and B-VPLS contexts
• Distributed LAG, MC-LAG, RSTP
• MSTP in a management VPLS monitoring (B- or I-) SAPs and pseudowire
• BVPLS service resiliency, loop avoidance solutions – Mesh, active/standby pseudowires
and multi-chassis endpoint
• IVPLS service resiliency, loop avoidance solutions – Mesh, active/standby pseudowires
(PE-rs only role)
To support these resiliency options, extensive support for blackhole avoidance mechanisms is
required.
Porting existing VPLS LDP MAC Flush in PBB VPLS
Both the I-VPLS and B-VPLS components inherit the LDP MAC flush capabilities of a regular
VPLS to fast age the related FIB entries for each domain: CMACs for I-VPLS and BMACs for B-
VPLS. Both types of LDP MAC flush are supported for I-VPLS and B-VPLS domains:
• flush-all-but-mine - flush on positive event, for example:
→ Pseudowire activation — VPLS resiliency using active/standby pseudowire
→ Reception of a STP TCN
• flush-all-from-me - flush on negative event, for example:
→ SAP failure – link down or MC-LAG out-of-sync
→ Pseudowire or Endpoint failure
In addition, only for the B-VPLS domain, changing the backbone source MAC of a B-VPLS will
trigger a LDP MAC flush-all-from-me to be sent in the related active topology. At the receiving
PBB PE, a BMAC flush automatically triggers a flushing of the CMACs associated with the old
source BMAC of the B-VPLS.