[nsp] Ibgp peer formula

[Andrew Lee]

How many route reflectors to use doesn't have an easy formula.  It really 
depends on the size of the network, the geography it covers, and how much 
budget there is.  On nationwide networks, one technique I have seen work well 
is to divide the country in half, with 2 reflectors in each half (for a total 
of 4) and have routers peer with the reflectors in their half.  It is also a 
good idea to have dedicated route reflectors, that is, routers that do not pass 
production traffic, but simply manage all the peerings and routes.  This would 
give you 2 peerings per router with n*2 adjacencies on the network.

michael earls wrote:

> I was thinking BGP peer groups with Route Reflectors. 
> 
> Thanks all for your help.
> 
> michael
> 
> On Mon, 12 Jul 2004 08:18:36 -0500, Andrew Lee wrote
> 
>>Well since IBGP should be a full mesh, for n routers, n-1 peerings 
>>per router, or n*(n-1)/2 adjacencies, are required.  If you don't 
>>want to do a full mesh, you should use a technique like route 
>>reflectors, where each router peers with atleast one reflector (RFC 
>>2796).
>>