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@tevapharm.com
wrote:
Correct, Luke.
Best regards,
Alex
-----Original Message----- From: Luke Guillory (External) [mailto:lguillory@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
Tel: 985.536.1212 Fax: 985.536.0300 Email: lguillory@reservetele.com
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-----Original Message----- From: NANOG [mailto:nanog-bounces@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@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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