MPLS Fast reroute questions

From: Andrew Smith (as160@yahoo.com)
Date: Wed Aug 22 2001 - 00:51:29 EDT


Hi, all

In the documentation regarding fast reroute, it says "
If a node detects either that a downstream link has
failed (using a link-layer specific liveness
detection mechanism) or that a downstream node has
failed (for example, using the RSVP neighbor hello
protocol)"

What exactly is "link-layer specific liveness
detection mechanism". What do I need to do to
configure it for different L2 medium (POS, Ethernet,
etc)

What are some of the commands to monitor this feature,
say, the time it take to reroute the traffic.

How does MPLS handle this, will it issue a new lable
for the backup path? How will MPLS labels behave when
the primary path comes back?

TIA for any input.
---andrew

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