North American Network Operators Group

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IS-IS protocol implementation problem

  • From: Sean Donelan
  • Date: Sun Oct 29 17:59:10 2000

Network operators using IS-IS on Cisco should be aware of a problem
which can result in their routers reloading unexpectedly when a corrupt
IS-IS packet is received.  Cisco has fixed the problem in various 12.0
software trains.  The problem can cascade through a single provider's
network.  Because IS-IS is an IGP protocol, it does not propagate between

This has already affected a provider.  I haven't found out what is
originating the bad IS-IS packet, i.e. is this an inter-vender operability