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Cisco Bug: CSCvv11885 - 731.15I-Invalid neighbor address in SRTE topology when IP numbered/unumbered p2p links used

Last Modified

Sep 16, 2020

Products (1)

  • Cisco ASR 9000 Series Aggregation Services Routers

Known Affected Releases

7.3.1.BASE

Description (partial)

Symptom:
SRTE ipv4 topology  shows  an invalid neighbor address (remote address) for valid local ip numbered link.

SRTE CLI output :
show segment-routing traffic-eng ipv4 topology ospf

----
Link[4]: local address 201.x.x.x, remote address 0.0.0.59     ----  >>> remote address in invalid here
    Local node:
      OSPF router ID: <router ID> area ID: 0
    Remote node:
      TE router ID: <Loopback IP>
      OSPF router ID: <router ID> area ID: 0
    Metric: IGP 10, TE 10, Latency 10 microseconds
    Bandwidth: Total link 2500000000, Reservable 0
    Admin-groups: 0x00000008
    Admin-groups-detail: Green(3)
    Adj SID: 42104 (unprotected) 51001 (unprotected)
----

The issue does not affect OSPF protocol working or routing but the incorrect reporting of topology may affect computations such as SRTE.

Conditions:
This condition is related to OSPF topology export via BGP-LS or other internal mechanism for topology computations such as SRTE.

The requirement is that there are multiple point-to-point links between two nodes and at least one of them is IP unnumbered while others are links with IP addresses configured on them. Additionally, this issue would be seen only in some combinations or ordering of these links within the OSPF Router LSA generated by the two nodes.
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