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Cisco Bug: CSCsz18677 - isis may crash with intf flap if prefix tag deployment is non-uniform

Last Modified

May 16, 2018

Products (1)

  • Cisco Carrier Routing System

Known Affected Releases

3.6.2.BASE

Description (partial)

Symptom:
     
     ISIS process crash.
     
     Conditions:
     
     [ This happened on a CRS-1 router running IOS XR 3.6.2 after an
       interface flap. ]
 
 #                           epsilon 20
 #                   +---------------------------+
 #          10       |     10                    |
 # [crash] ----  [ one ] ------- [hipri]     [nonpreflo]
 #         alpha     |     beta
 #                   |
 #                   | 10 gamma
 #                   |
 #                [hipri2]
 
     The problem is run into when a prefix is advertised with and without a
     tag. The tag is set on a higher priority nodes and causes a high priority
     to be set on the prefix. The non-preferred node has no tag and a lower
     priority on the prefix for that node.
  
     When the [crash] router loses connection to the [one] router
     (i.e., all beyond [one] node are unreachable crash is encountered.
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