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Cisco Bug: CSCvu38441 - ISIS-TILFA: unexpected backup path calculated

Last Modified

Sep 10, 2020

Products (1)

  • Cisco IOS

Known Affected Releases

17.4.1

Description (partial)

Symptom:
TILFA backup path to neighbor1 connected via high metric link may be calculated via some different neighbor2, but instead of using nex-hops of neighbor2 it's used next-hop of neighbor1.

Conditions:
Topology specific. Not seen in usual ring topology. Problem may be seen if in the ring exists some short cut links.
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