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How to change hold-down timer of bfd echo mode on cisco nexus 7k?

Herman2018
Level 3
Level 3

Hi, How to change hold-down timer of bfd echo mode on cisco nexus 7k? the hold-timer is still 6s for echo mode when  the command "bfd interval 50 min_rx 50 multiplier 3" is configured on the interface ?  anyone please advise, thanks in advance!

5 Replies 5

balaji.bandi
Hall of Fame
Hall of Fame

Can you post the config bit and output ? (what nexus code running ?)

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Thanks Babaji for your response!

The configuration for bfd is shown as below. (bfd echo mode)

1. interface xxxx

      ip ospf bfd

      no ip redirects

     ip ospf network point-to-point

   bfd interval 50 min_rx 50 multip 3

2. router ospf 1

      bfd

 

 

I will run lab and check the value. 

I run lab and I see hoddown (hits) always 0 (0) except the case the BFD is missing then the holddown will start count. 
so can I see 
show bfd neighbor detail 

Hi MHM,, what you describe about holddown (hit) is correct. but my question is the value of the holddown under echo mode. We set the bfd hello /tx interval and min_rx interval to 50 , and multiplier is set to 3. finally this values are shown as below: the holddown value is 6000ms (6s), but hello interval is 50ms with multiplier 3, then how bfd works to judge the failure? 3 hello packets : 50ms x 3? Please advise, thanks. 

10.x.y.z 10.a.bc.c  1124073773/1107296258 Up 5070(3) Up Eth1/18 default SH

Session state is Up and using echo function with 50 ms interval

Session type: Singlehop
Local Diag: 0, Demand mode: 0, Poll bit: 0, Authentication: None
MinTxInt: 50000 us, MinRxInt: 2000000 us, Multiplier: 3
Received MinRxInt: 50000 us, Received Multiplier: 3
Holdown (hits): 6000 ms (0), Hello (hits): 50 ms (872429985)
Rx Count: 21781382, Rx Interval (ms) min/max/avg: 0/1809/1743 last: 929 ms ago
Tx Count: 872429985, Tx Interval (ms) min/max/avg: 43/43/43 last: 5 ms ago
Registered protocols: pim ospf

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