[c-nsp] BGP routes: 207k + 157k = 238k ???...

[Vincent De Keyzer]

Hi guys,

there is something I can't quite figure out with BGP.

Let a bi-homed AS with only two BGP speakers (each of them has one eBGP 
session with a different upstream, they speak iBGP together).

Router 1 receives 238k routes from provider A; so does router 2 from 
provider B.

When looking at iBGP, it can be seen that router 1 sends 207k routes to 
router 2, while router 2 sends only 157k routes to router 1.

I'm surprised by these numbers: the sum of routes from 1 to 2 plus 
routes from 2 to 1 not only does not equal 238k, but is even greater 
than 238k (I would have understood it was smaller).

What does these numbers mean?...

Vincent