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Cisco Bug: CSCvt12153 - CSPF check backup path failure when interoperability with Alu7750 at 701

Last Modified

Sep 02, 2020

Products (1)

  • Cisco ASR 9000 Series Aggregation Services Routers

Known Affected Releases

7.0.1.BASE 7.1.1.BASE

Description (partial)

Symptom:
Auto-tunnel backup path failure in the following topology.
Active path: 540 -> Alu1
Backup path: 540 -> Alu2 -> Alu1

Alu2-----Alu1
  -            -
   -          - 
    -       -
    ncs540

From debug, display no path, if shutdown link between 540 and alu1, LSP can work, 540 -> Alu2 -> Alu1

RP/0/RP0/CPU0:Feb 19 00:19:31.185 UTC: te_control[1074]: DBG-PATH-SPF[7492]: rrr_pcalc_unthread_tent_db:7972 (Tunnel ID: 6155): TENT database is empty
RP/0/RP0/CPU0:Feb 19 00:19:31.184 UTC: te_control[1074]: DBG-PATH-LOOKUP[7492]: rrr_pcalc_get_path_internal:11449 (Tunnel ID: 6155): TE-PCALC_PATH: No Path to destination 10.13.200.1

And had following debug:

RP/0/RP0/CPU0:Feb 19 16:15:43.502 UTC: te_control[1074]: DBG-PATH-SPF[7550]: rrr_pcalc_node_exclude:3074 (Tunnel ID: 0):  TE-PCALC_SPF: rrr_pcalc_node_exclude: marked 0100.1320.0001.00 gen 20155, igp IS-IS 9919 level-1

Conditions:
XR: 701
The issue was found when set up backup path by auto-tunnel.
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