Virtual Private LAN Services
7750 SR OS Services Guide Page 499
document draft-ietf-l2vpn-vpls-multihoming. The initial implementation allows the use of BGP
Local Preference but does not support VPLS preference.
Supported Services and Multi-Homing Objects
This feature is supported for the following services:
• LDP VPLS with or without BGP-AD
• BGP VPLS
• mix of the above
• PBB BVPLS on BCB (no IVPLS/Epipe children)
The following access objects can be associated with MH SITE:
•SAPs
• SDP bindings (pseudowire object), both mesh-sdp and spoke-sdp
• Split Horizon Group
→ Under the SHG we can associate either one or multiple of the following objects:
SAP(s), pseudowires (BGP VPLS, BGP-AD, provisioned and LDP signaled spoke-
sdp and mesh-sdp)
Blackhole Avoidance
Blackholing refers to the forwarding of frames to a PE that is no longer carrying the designated
forwarder. This could happen for traffic from:
• Core PE participating in the main VPLS
• Customer Edge devices (CEs)
• Access PEs - pseudowires between them and the MH PEs are associated with MH Sites
Changes in DF election results or MH site status must be detected by all of the above network
elements to provide for Blackhole Avoidance.
MAC Flush to the Core PEs
Assuming there is a transition of the existing DF to non-DF status. The PE that owns the MH site
experiencing this transition will generate a MAC flush-all-from-me (negative MAC flush) towards
the related core PEs. Upon reception, the remote PEs will flush all the MACs learned from the MH
PE.
To Next Page
Loading...
