November 2004
Intermediate to advanced
336 pages
11h 24m
English
Content preview from Fault-Tolerant IP and MPLS Networks
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208 Chapter 8: MPLS Control Plane: Restarting LDP Gracefully
If the restarting LSR is an egress LSR for the LSP, depending on whether the LSR is configured
to generate a non-NULL or NULL (either Implicit or Explicit), the LSR performs the following
functions:
• Creates the LDP state
• Updates the MPLS forwarding state (clears the stale flag)
• Either advertises a <FEC, non-NULL> or <FEC, NULL> mapping to its peers, as
appropriate
However, if a matching forwarding state entry is not found, regardless of a nonegress or egress
case, the restarting LSR follows the normal LDP procedures. The detailed operation of the LDP
GR mechanism is described in the ...
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