[AusNOG] BFD on transit connections

[Mark ZZZ Smith]

The other thing to remember is that link carrier down might/should cause the BGP session to be torn down virtually instantly if you have a direct physical link between the routers. BGP keepalives and BFD are there for when that isn't the case.
      From: Alex Samad - Yieldbroker <Alex.Samad at yieldbroker.com>
 To: "ausnog at lists.ausnog.net" <ausnog at lists.ausnog.net> 
 Sent: Wednesday, 11 February 2015, 11:06
 Subject: Re: [AusNOG] BFD on transit connections
   
#yiv2131686144 #yiv2131686144 -- _filtered #yiv2131686144 {font-family:Calibri;panose-1:2 15 5 2 2 2 4 3 2 4;} _filtered #yiv2131686144 {font-family:Tahoma;panose-1:2 11 6 4 3 5 4 4 2 4;}#yiv2131686144 #yiv2131686144 p.yiv2131686144MsoNormal, #yiv2131686144 li.yiv2131686144MsoNormal, #yiv2131686144 div.yiv2131686144MsoNormal {margin:0cm;margin-bottom:.0001pt;font-size:12.0pt;}#yiv2131686144 a:link, #yiv2131686144 span.yiv2131686144MsoHyperlink {color:blue;text-decoration:underline;}#yiv2131686144 a:visited, #yiv2131686144 span.yiv2131686144MsoHyperlinkFollowed {color:purple;text-decoration:underline;}#yiv2131686144 span.yiv2131686144EmailStyle17 {color:#1F497D;}#yiv2131686144 .yiv2131686144MsoChpDefault {} _filtered #yiv2131686144 {margin:72.0pt 72.0pt 72.0pt 72.0pt;}#yiv2131686144 div.yiv2131686144WordSection1 {}#yiv2131686144 Hi    That is the backup plan    Alex    

From: Tom Paseka [mailto:tom at cloudflare.com]
Sent: Wednesday, 11 February 2015 11:05 AM
To: Alex Samad - Yieldbroker
Cc: ausnog at lists.ausnog.net
Subject: Re: [AusNOG] BFD on transit connections    Just configure the lower timer :) (10/30 seconds being all that Junipers will accept). BGP will negotiate the lowest possible time between peers.    -Tom    On Tue, Feb 10, 2015 at 3:56 PM, Alex Samad - Yieldbroker <Alex.Samad at yieldbroker.com> wrote: Hi


I have been in the process of trying to BFD all my BGP peers recently, to bring down my convergence times.

Interestingly I deal with 4 providers, so far I have had 2 who will not implement nor plan to. 1 who is thinking about it and 1 who was ready to turn it on.

This has raised my curiosity a bit. When I asked the list about low values for BGP keepalive/hold, I got the impression some (few) used low values. But most used the default 3m.

3min seem like an eternity in networking time.

So am I being a bad netizen asking for BFD or low (10/30) BGP timers ?

Alex

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