Cisco Bug: CSCvt62547 - ISIS holding a route even if nexthop tunnel-te is down
Jun 19, 2020
- Cisco ASR 9000 Series Aggregation Services Routers
Known Affected Releases
Symptom: ISIS holding a route with nexthop as tunnel-te<xyz>. The tunnel-te<xyz> is down and ISIS still holds the route with nexthop as tunnel-te<xyz>. Hence, the route is seen in RIB as well. A correct route gets installed after ISIS process restart Conditions: Topology: R2---- R3 --- R1 R2 - headend, R3 midpoint, R1 tailend. Issue Trigger Steps: 1. Add ISIS interface TE0/1/0/1.102 on R3 in wrong ISIS instance core, 2. Check for isis database having tail-end router-id (18.104.22.168) from 2 ISIS LSP IDs one of instance core & other of ISIS_PREAGG, 3. Remove wrongly added isis interface TE0/1/0/1.102 from ISIS core, 4. Delete ISIS instance ISIS_PREAGG config from midpoint R3 & tail-end R1, 5. Reload tail-end R1.
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