How are you configuring BFD timers?

Wed Mar 21 16:57:14 UTC 2018

Right, BFD on a dark fiber link (should) be immediately detected and the
detecting end should send a cease/stop/whatever message to the remote peer
to drop the neighbor relationship.

BFD really comes into it's own in a derived circuit (such as metro-E or
other type setup) where you can have an indirect failure (traffic does not
pass, but the last mile link remains up).

Ken

On Wed, Mar 21, 2018 at 10:44 AM, Alex Lembesis <Alex.Lembesis at tevapharm.com
> wrote:

> Correct, Luke.
>
> Best regards,
>
> Alex
>
>
>
> -----Original Message-----
> From: Luke Guillory (External) [mailto:lguillory at reservetele.com]
> Sent: Wednesday, March 21, 2018 12:37 PM
> To: Alex Lembesis; Job Snijders (External); Youssef Bengelloun-Zahr
> Cc: NANOG
> Subject: RE: How are you configuring BFD timers?
>
> He's asking because if it was dark the interface would go down when the
> link was lost and the router would pull routes. But PA to FL would lead me
> to believe it'll be a wave from some type of DWDM gear which brings us to
> BFD.
>
>
>
>
>
>
> Luke Guillory
> Vice President – Technology and Innovation
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> -----Original Message-----
> From: NANOG [mailto:nanog-bounces at nanog.org] On Behalf Of Alex Lembesis
> Sent: Wednesday, March 21, 2018 11:31 AM
> To: Job Snijders (External); Youssef Bengelloun-Zahr
> Cc: NANOG
> Subject: RE: How are you configuring BFD timers?
>
> To speed up BGP routing convergence.  The (2x) dark fiber links from PA to
> FL are being used as Layer3 datacenter interconnects, where each datacenter
> has its own AS.  The DF is also carrying FCIP traffic, so we need failover
> to be as fast as possible.
>
> Best regards,
>
>
>
> Alex
>
>
>
> -----Original Message-----
> From: Job Snijders (External) [mailto:job at instituut.net]
> Sent: Wednesday, March 21, 2018 12:25 PM
> To: Youssef Bengelloun-Zahr
> Cc: Alex Lembesis; NANOG
> Subject: Re: How are you configuring BFD timers?
>
> Silly question perhaps, but why would you do BFD on dark fiber?
>
> Kind regards,
>
> Job
>
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