[96327] in North American Network Operators' Group
Re: BGP Session Timeout
daemon@ATHENA.MIT.EDU (Pascal Gloor)
Tue May 1 03:59:25 2007
In-Reply-To: <262b67200704300017jb7af7dkf7156df4d969af09@mail.gmail.com>
Cc: nanog@merit.edu
From: Pascal Gloor <pascal.gloor@spale.com>
Date: Tue, 1 May 2007 09:58:23 +0200
To: Saqib Ilyas <msaqib@gmail.com>
Errors-To: owner-nanog@merit.edu
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> Is it likely that BGP times out before underlying IP topology
> reconvergences
> after a link/node failure? Do service providers ever set such low
> values of
> BGP timeouts that BGP timeout will occur?
>
> If not, what else may cause a BGP session to time out?
Depending on your hardware, you can trigger your BGP and IGP to shut
sessions when the peer is gone.
On some cisco, you can have BFD (Bidirectional Forwarding Detection).
you have to enable this on both sides. If BFD notices the peer is
down, it will notify OSPF,BGP,... (if configured so).
for example:
!
interface GigabitEthernet0/0
ip address 10.1.1.1 255.255.255.252
bfd neighbor 10.1.1.2
bfd interval 250 min_rx 250 multiplier 3
ip ospf bfd
!
This will send a BFD packet every 250ms, expect one every 250ms and
if 3 packets are missed (after 750ms) it will tell OSPF to shut any
session towards 10.1.1.2 (or routed via 10.1.1.2 for the BGP case).
Pascal
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