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This draft is a work item of the IS-IS for IP Internets Working Group of the IETF.
Title : Restart signaling for IS-IS
Author(s) : M. Shand
Filename : draft-ietf-isis-restart-05.txt
Pages : 21
Date : 2004-1-14
The IS-IS routing protocol (RFC 1195 [2], ISO/IEC 10589 [3]) is a
link state intra-domain routing protocol. Normally, when an IS-IS
router is restarted, temporary disruption of routing occurs due to
events in both the restarting router and the neighbors of the
restarting router.
The router which has been restarted computes its own routes before
achieving database synchronization with its neighbors. The results
of this computation are likely to be non-convergent with the routes
computed by other routers in the area/domain.
Neighbors of the restarting router detect the restart event and
cycle their adjacencies with the restarting router through the down
state. The cycling of the adjacency state causes the neighbors to
regenerate their LSPs describing the adjacency concerned. This in
turn causes temporary disruption of routes passing through the
restarting router.
In certain scenarios the temporary disruption of the routes is
highly undesirable. This draft describes mechanisms to avoid or
minimize the disruption due to both of these causes.
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