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Cisco Bug: CSCuo31034 - BFD state is unknown after router reload

Last Modified

Dec 04, 2018

Products (8)

  • Cisco ASR 9000 Series Aggregation Services Routers
  • Cisco ASR 9922 Router
  • Cisco IOS XR Software
  • Cisco ASR 9010 Router
  • Cisco ASR 9904 Router
  • Cisco ASR 9006 Router
  • Cisco ASR 9001 Router
  • Cisco ASR 9912 Router

Known Affected Releases

5.1.1.BASE 6.1.1.FWDG

Description (partial)

Symptom:
After reloading a A9K-1x100GE-SE linecard, BFD may fail to initialize with fib_mgr correctly leaving bfd not operational on the line card.

The show bfd session will show the bfd session state as Unknown while the bfd agent on the line card shows the session in Retry.

RP/0/RSP0/CPU0:router#sh bfd agent loc 0/1/cpu0
Tue Jun 14 08:00:14.344 UTC
IPV4 Sessions Up: 0, Down: 0, Standby: 0, Unknown: 0, Retry: 1, Total: 1

show bfd trace verbose on the line card displays the error "fib_connection NOT up"

Jun 14 06:51:31.452 ip_bfd/events 0/1/CPU0 t1  Create session [intf=HundredGigE0/1/0/0 (ifh=0x60000c0), Dst=10.3.28.26, Src:0.0.0.0], parent i/f: NULLIFHNDL (0x0), detect 300000 us, mult 3, app/state 4294967295
Jun 14 06:51:31.452 ip_bfd/events 0/1/CPU0 t1  Session subtype PR/V4/SH, bundle ifh 0x0, caps 0, iftype 0, create type 0
Jun 14 06:51:31.455 ip_bfd/fib 0/1/CPU0 t1  Doing FIB register for 26.28.3.10, ifh:HundredGigE0/1/0/0 (0x60000c0), table id 0xe0000000, fib_connection NOT up

Conditions:
This issue is rarely seen after the line card is reloaded.
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