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Cisco Bug: CSCvi10244 - BFD coming with OSPF neighbor in 2way

Last Modified

Sep 14, 2019

Products (1)

  • Cisco Nexus 7000 Series Switches

Known Affected Releases

7.2(1)N1(1)

Description (partial)

Symptom:
Customer sees BFD established with a neighbor which is not in the Full state.

Outputs:
OurAddr         NeighAddr       LD/RD                 RH/RS           Holdown(mult)     State           Int                Vrf
10.252.0.2      10.252.0.3      1090519856/1090520005 Up              4929(3)           Up          Vlan1             default

Session state is Up and using echo function with 50 ms interval
Local Diag: 0, Demand mode: 0, Poll bit: 0, Authentication: None
MinTxInt: 50000 us, MinRxInt: 2000000 us, Multiplier: 3
Received MinRxInt: 2000000 us, Received Multiplier: 3
Holdown (hits): 6000 ms (0), Hello (hits): 2000 ms (437084)
Rx Count: 461262, Rx Interval (ms) min/max/avg: 660/1636/1630 last: 1070 ms ago
Tx Count: 437084, Tx Interval (ms) min/max/avg: 1720/1720/1720 last: 1621 ms ago
Registered protocols:  ospf
Last packet: Version: 1                - Diagnostic: 0
             State bit: Up             - Demand bit: 0
             Poll bit: 0               - Final bit: 0
             Multiplier: 3             - Length: 24
             My Discr.: 1090520005     - Your Discr.: 1090519856
             Min tx interval: 50000    - Min rx interval: 2000000
             Min Echo interval: 50000  - Authentication bit: 0
Down reason: None, Reason not-hosted: None

<<<<<<<<<<<<<<<<<<<<<<<<<<<<<OSPF
NX# sh ip ospf neighbors vlan 1
Neighbor ID     Pri State            Up Time  Address         Interface
10.1.255.3      1 TWOWAY/DROTHER   1w2d     10.252.0.3      Vlan1
10.1.255.4      1 FULL/BDR         1w2d     10.252.0.4      Vlan1
10.1.255.5      1 FULL/DR          1w2d     10.252.0.5      Vlan1

Conditions:
Related to an order of operations. Flapping OSPF triggers the issue.
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