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Cisco Bug: CSCvu66610 - OSPF does not enforce WSRLG backup Path in certain scenario

Last Modified

Oct 01, 2020

Products (1)

  • Cisco ASR 9000 Series Aggregation Services Routers

Known Affected Releases

7.3.1.BASE

Description (partial)

Symptom:
WSRLG back up path is not enforced via certain Path.
Topology
     10
R1-----R2------R3
 \        /               |
  \      /                | 10
   \    /                 |
    R6------------R7
SRLG Value of 10 is configured on link  between R1 and R2 AND R7 and R3.WSRLG is enabled on R1.
Primary Path is R1—R2---R3.WSRLG back up path chosen is via R6. we should have enforced the WSRLG backup Path via R2.
r1#show ospf route 3.3.3.3/32 backup detail

OSPF Route entry for 3.3.3.3/32
  Route type:  Intra-area
  Last updated: Jun 12 09:26:04.476 
  Metric: 3
  SPF priority: 4,  SPF version: 85
  RIB version: 0,  Source: Unknown
  Label Info: Default 16103 SSPF 16503 Type SR
       12.0.0.2, from 3.3.3.3, via TenGigE0/0/1/0, path-id 1
        LSA: 1/3.3.3.3/3.3.3.3, Area: 0
           Backup path: TI-LFA
              16.0.0.6, from 3.3.3.3, via TenGigE0/0/1/3, protected bitmap 0000000000000001
              Attributes: Metric: 4, Interface Disjoint, Weighted SRLG
r1#

Conditions:
Topology
     10
R1-----R2------R3
 \        /               |
  \      /                | 10
   \    /                 |
    R6------------R7
SRLG Value of 10 is configured on link  between R1 and R2 AND R7 and R3.WSRLG is enabled on R1.
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