[rbak-nsp] BGP - GracefulRestart & BFD - how does it work ?

[Marcin Kuczera]

>
>     Ok, config is quite clear. Dependencies between processes also.
>     However:
>
>     - if BFD runs on linecard, what happens if linecard crashes ? Is
>     it able to inform bgpd then ?
>
>
> This is different kind of events. The line card failure event have 
> different handling procedure, but result is the same - all processes 
> will receive appropriate notification. However, in case of iBGP or 
> multihop eBGP session you may want to have "fast-reset" option configured.

Right, I mean this should be quite logical so I should have known this ;)

>
>     I suppose that there is some BFD parent process on XCRP that
>     controls BFD on linecards, but - is it ?
>
>
> RIB is responsible for BFD provisioning from control plane side.

Ok. I know that redback/ericsson engineers/software designers are good 
engineers so probably nothing wrong happens,
but to be sure - what if ribd crashes ? Does it have any influence on 
BFD/BGP while unavailable ?

Regards,
Marcin


>
>     - I assume that BFD informing BGPd causes all bgp session timers
>     clear down instantly. Right ?
>
>
> Yes, that is the reason why you would want to use BFD for eBGP sessions.
>
> -- 
> Best regards,
> Yuri

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