Mac Flush With Stp; Figure 45: Hvpls With Sap Redundancy - Alcatel-Lucent 7210 SAS M Service Manual

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Virtual Private LAN Services

MAC Flush with STP

A second application of Hierarchical VPLS is in the use of Multi Tenant Units (MTU). MTUs are

typically not MPLS-enabled, and thus have Ethernet links to the closest PE node (see

below). To protect against failure of the PE node, an MTU could be dual-homed and thus have two

SAPs on two PE nodes. To resolve the potential loop, STP is activated on the MTU and the two

Like in the scenario above, STP only needs to run in a single VPLS instance, and the results of the

STP calculations are applied to all VPLSes on the link. Equally, the standby node will broadcast

MAC flush LDP messages in the protected VPLS instances when it detects that the active node

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