On 04/01/2013 10:34 PM, Nick Hilliard wrote:
On 01/04/2013 02:07, David Walters wrote:
Just a quick post to ask peoples experiences of tuning BGP convergence?
We're in the process of tuning the network to to achieve optimal
convergence (ie quick) and was wondering if anyones achieved this
outside of changing keepalive/holdtimers to 1 and 3. We're using 4900s
and playing with <100 prefixes.
This doesn't sound sensible. You should use a tightly tuned IGP (e.g.
ospf) to handle your interior network connectivity and rapid convergence
requirements. BGP can then do the heavy lifting for prefix handling.
Although 1/3 second timers have always seemed a bad idea to me, slow
detection of dead BGP sessions can still cause issues. OP should look
into the availability of BFD or neighbour fall-over if they suffer from
these.
You can simulate the latter with yucky EEM scripts and route track
objects if your platform lacks "neighbor fall-over route-map" support
(which most do...)
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