BGP update intervals

[bapatsubodh]

Hello,

when we add a new prefix in BGP process by network  command, when will the router send this new pre-fix as update to it's  neighbors?

It looks like immediate as shown by   "debug  ip bgp update" or is there is certain interval that router waits and  will send the update at next interval. 

(scan interval , BGP update delay, advertisement interval)

Similar  to this is when pre-fixes are filtered / attributes changed using  route-maps, when does the router take in account the newly applied  route-maps?

Please share the experience.

Thanks!

Subodh

[smitesh kharecha]

Hi Subodh,

when we add a new prefix in BGP process by network  command, when will the router send this new pre-fix as update to it's  neighbors?

BGP will send this update to its neighbour only if that prefix is present in that router's routing table. When talking in terms of time, it will be send immediately ( baring few seconds it needs to check routing table and reachability of the prefix).

When attributes or route-maps are modified, it will be send only at next bgp scan interval or else when you manually clear the bgp neighbour ( either hard or soft).

Please rate if helpful.

HTH,

Smitesh