Selective Mac Flush; Figure 39: Hvpls With Sap Redundancy - Alcatel-Lucent 7750 SR OS Service Manual

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VPLS Features

Selective MAC flush

When using STP as described above is not appropriate, the "Selective MAC flush" feature can be

used instead.

In this scenario, the 7x50 that detects a port failure will send out a flush-all-from-ME LDP

message to all PEs in the VPLS. The PEs receiving this LDP message will remove all MAC

entries originated by the sender from the indicated VPLS.

A drawback of this approach is that selective MAC flush itself does not signal that a backup path

was found, only that the previous path is no longer available. In addition, the selective MAC Flush

mechanism is effective only if the CE and PE are directly connected (no intermediate hubs or

bridges) as it reacts only to a physical failure of the link. Consequently it is recommended to use

the MAC flush with STP method described above where possible.

Figure 7: HVPLS with SAP Redundancy

7750 SR OS Services Guide