Cisco Bug: CSCsz18677 - isis may crash with intf flap if prefix tag deployment is non-uniform
May 16, 2018
- Cisco Carrier Routing System
Known Affected Releases
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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Bug Details Include
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