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MAC flush-all-from-me indication is sent using the following core mechanisms:
• For LDP VPLS running between core PEs, existing LDP MAC flush will be used.
• For pseudowire signaled with BGP VPLS, MAC flush will be provided implicitly using
the L2-Info Extended community to indicate a transition of the active MH-site: for
example the attached object(s) going down or more generically, the entire site going from
Designated Forwarder (DF) to non-DF.
• Note that double flushing will not happen as it is expected that between any pair of PEs it
will exist only one type of pseudowires – either BGP or LDP pseudowire but not both.
Indicating non-DF status towards the access PE or CE
For the CEs or access PEs support is provided for indicating the blocking of the MH site using the
following procedures:
• For MH Access PE running LDP pseudowires the LDP standby-status is sent to all LDP
pseudowires.
• For MH CEs site de-activation is linked to a CCM failure on a SAP that has a down MEP
configured.
BGP Multi-Homing for VPLS Inter-Domain Resiliency
BGP MH for VPLS can be used to provide resiliency between different VPLS domains. An
example of a Multi-Homing topology is depicted in Figure 82.
Figure 82: BGP MH used in a HVPLS topology
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