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.lembe...@tevapharm.com > wrote: > Correct, Luke. > > Best regards, > > Alex > > > > -----Original Message----- > From: Luke Guillory (External) [mailto:lguill...@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: lguill...@reservetele.com > > Reserve Telecommunications > 100 RTC Dr > Reserve, LA 70084 > > ____________________________________________________________ > _____________________________________ > > Disclaimer: > The information transmitted, including attachments, is intended only for > the person(s) or entity to which it is addressed and may contain > confidential and/or privileged material which should not disseminate, > distribute or be copied. Please notify Luke Guillory immediately by e-mail > if you have received this e-mail by mistake and delete this e-mail from > your system. E-mail transmission cannot be guaranteed to be secure or > error-free as information could be intercepted, corrupted, lost, destroyed, > arrive late or incomplete, or contain viruses. Luke Guillory therefore does > not accept liability for any errors or omissions in the contents of this > message, which arise as a result of e-mail transmission. . > > -----Original Message----- > From: NANOG [mailto:nanog-boun...@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:j...@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 > > This message is intended solely for the designated recipient(s). It may > contain confidential or proprietary information and may be subject to > attorney-client privilege or other confidentiality protections. If you are > not a designated recipient you may not review, copy or distribute this > message. If you receive this in error, please notify the sender by reply > e-mail and delete this message. Thank you. > > This message is intended solely for the designated recipient(s). It may > contain confidential or proprietary information and may be subject to > attorney-client privilege or other confidentiality protections. If you are > not a designated recipient you may not review, copy or distribute this > message. If you receive this in error, please notify the sender by reply > e-mail and delete this message. Thank you. >
