BGP hold timer on IX LAN

Colin Johnston colinj at
Tue Oct 27 08:42:36 UTC 2015

low bgp timers usually done to allow faster hsrp failover result


Sent from my iPhone

> On 27 Oct 2015, at 08:20, Nick Hilliard <nick at> wrote:
>> On 27/10/2015 08:31, marcel.duregards at wrote:
>> I'm asking because we see more and more peering partners which force the
>> hold timer to a lower value, and when BGP negotiate the timer, the lowest
>> hold timer is the winner.
> You need to be careful with this.  On larger IXPs, there will be a wide
> variety of kit with different capabilities, which will usually work well in
> most circumstances, but which may not have enough cpu power to handle edge
> cases like e.g. ixp maintenance or flaps when you get large amounts of bgp
> activity.  A low bgp timer might be fine for, say an asr9k or an mx960 with
> the latest RE/RSP, but would be actively harmful if one of your peers is
> using an mx80 or a sup720.
> Nick

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