VPLS Features
Page 354 7750 SR OS Services Guide
This section specifies that all MAC addresses learned from the source are flushed. This message
has been implemented as an LDP address message with vendor-specific type, length, value (TLV),
and is called the flush-all-from-ME message.
The draft definition message is currently used in management VPLS which is using RSTP for
recovering from failures in Layer 2 topologies. The mechanism described in this document
represent an alternative solution.
The advantage of this approach (as compared to RSTP based methods) is that only MAC-affected
addresses are flushed and not the full forwarding database. While this method does not provide a
mechanism to secure alternative loop-free topology, the convergence time is dependent on the
speed of the given CE device will open alternative link (L2-B switch in Figure 40) as well as on
the speed PE routers will flush their FDB.
In addition, this mechanism is effective only if PE and CE are directly connected (no hub or
bridge) as it reacts to physical failure of the link.
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