[c-nsp] BFD expectations

[Marc Binderberger]

Hello Jason,

> The BFD timers are set to their lowest values:
> 
> bfd interval 50 min_rx 50 multiplier 3
> 
> Interesting thing is that bfd neigh det doesn't seem to reflect that:

you mean the MinRx/Tx timers of 1sec? That's fine as you use echo mode.
MinRx/Tx is for the control packets which run slow speed when echo is
doing the fast transmit and detection.

I would expect you need to configure the spf timer values for ISIS as
well to avoid a long initial wait period. Not sure if your IOS versions
allow this.


Regards, Marc

> 
> c3600#show bfd neighbors  details 
> 
> NeighAddr                         LD/RD    RH/RS     State     Int
> xxx.xxx.196.128                     6/6     Up        Up        Gi0/5
> Session state is UP and using echo function with 50 ms interval.
> OurAddr: xxx.xxx.196.129 
> Local Diag: 0, Demand mode: 0, Poll bit: 0
> MinTxInt: 1000000, MinRxInt: 1000000, Multiplier: 3
> Received MinRxInt: 1000000, Received Multiplier: 3
> Holddown (hits): 0(0), Hello (hits): 1000(562047)
> Rx Count: 563901, Rx Interval (ms) min/max/avg: 1/1023/877 last: 598 ms ago
> Tx Count: 562049, Tx Interval (ms) min/max/avg: 1/1549/883 last: 692 ms ago
> Elapsed time watermarks: 0 0 (last: 0)
> Registered protocols: ISIS
> Uptime: 5d17h
> Last packet: Version: 1                  - Diagnostic: 0
>              State bit: Up               - Demand bit: 0
>              Poll bit: 0                 - Final bit: 0
>              Multiplier: 3               - Length: 24
>              My Discr.: 6                - Your Discr.: 6
>              Min tx interval: 1000000    - Min rx interval: 1000000
>              Min Echo interval: 50000   
> 
> NeighAddr                         LD/RD    RH/RS     State     Int
> xxx.xxx.199.184                       1/1     Up        Up        Gi0/2
> Session state is UP and using echo function with 50 ms interval.
> OurAddr: xxx.xxx.199.185   
> Local Diag: 0, Demand mode: 0, Poll bit: 0
> MinTxInt: 1000000, MinRxInt: 1000000, Multiplier: 3
> Received MinRxInt: 1000000, Received Multiplier: 3
> Holddown (hits): 0(0), Hello (hits): 1000(564093)
> Rx Count: 566056, Rx Interval (ms) min/max/avg: 1/1023/879 last: 378 ms ago
> Tx Count: 564095, Tx Interval (ms) min/max/avg: 1/1502/882 last: 464 ms ago
> Elapsed time watermarks: 0 0 (last: 0)
> Registered protocols: ISIS
> Uptime: 5d18h
> Last packet: Version: 1                  - Diagnostic: 0
>              State bit: Up               - Demand bit: 0
>              Poll bit: 0                 - Final bit: 0
>              Multiplier: 3               - Length: 24
>              My Discr.: 1                - Your Discr.: 1
>              Min tx interval: 1000000    - Min rx interval: 1000000
>              Min Echo interval: 50000