Hello David,
great tip. Unfortunatly BFD for BGP - though detailed documented - has
no examples flying around. Perhaps I am missing something here.
I have two routers connected via iBGP. I have tried to make the
configuration rather simple (only the important parts, BGP session is up
and running):
This is the same on both sides (change in the IP-addresses of course)
protocols bgp {
group internal {
type internal;
neighbor 91.190.xxx.xxx {
local-address 91.190.xxx.xxx;
bfd-liveness-detection {
minimum-interval 1000;
multiplier 3;
}
}
}
Router A:
show bfd session extensive
Detect Transmit
Address State Interface Time Interval
Multiplier
91.190.xxx.xxx Init 3.000 1.000
3
Client BGP, TX interval 1.000, RX interval 1.000
Session down time 00:00:04
Local diagnostic CtlExpire, remote diagnostic None
Remote state Down, version 1
Min async interval 1.000, min slow interval 1.000
Adaptive async TX interval 1.000, RX interval 1.000
Local min TX interval 1.000, minimum RX interval 1.000, multiplier 3
Remote min TX interval 1.000, min RX interval 1.000, multiplier 3
Local discriminator 1, remote discriminator 1
Echo mode disabled/inactive, no-absorb, no-refresh, update-adj
Multi-hop, min-recv-TTL 0, route table 0, local-address 91.190.xxx.xxx
1 sessions, 1 clients
Cumulative transmit rate 1.0 pps, cumulative receive rate 1.0 pps
Router B:
show bfd session extensive
Detect Transmit
Address State Interface Time Interval
Multiplier
91.190.xxx.xxx Down 0.000 1.000
3
Client BGP, TX interval 1.000, RX interval 1.000
Local diagnostic None, remote diagnostic None
Remote state AdminDown, version 1
Min async interval 1.000, min slow interval 1.000
Adaptive async TX interval 1.000, RX interval 1.000
Local min TX interval 1.000, minimum RX interval 1.000, multiplier 3
Remote min TX interval 0.000, min RX interval 0.000, multiplier 0
Local discriminator 1, remote discriminator 0
Echo mode disabled/inactive, no-absorb, no-refresh
Multi-hop route table 0, local-address 91.190.xxx.xxx
1 sessions, 1 clients
Cumulative transmit rate 1.0 pps, cumulative receive rate 0.0 pps
I see the diagnostic on router A but do not understand it. I thought the
minimum-interval might be too low, so I set it up to a thousand.
Regards,
Matthias
David Ball schrieb:
There are likely several answers to that, all dependant on your
topology and protocol use. But, a good place to start would be BFD
(bidirectional forwarding detection). Juniper has decent support for
it working with other protocols (OSPF, ISIS, BGP, RIP), notifying them
that something may be wrong, allowing them to then make a decision
(support may differ from protocol to protocol). That may be a good
start point.
http://www.juniper.net/techpubs/software/junos/junos95/swconfig-routing/swconfig-routing-IX.html#B
David B
2009/9/6 Matthias Gelbhardt <matth...@commy.de>:
Hi!
I wonder what the best practices for optimized switchovers would be? I mean
fast comprehension of failed BGP connections? A fibre cut or something like
that, how can I be sure, that my routers are detecting the failed session as
soon as possible? What would be the best practices fpr that?
Regards,
Matthias
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