Core router vs Edge Router aggregation

[blitzperf]

Hello everyone!

A bit of topology background: I currently have two edge routers facing IX's. Behind the two edge routers, I have two core routers. These core routers are connected to other routers running OSPF and iBGP.

Please refer to the sample topology below:

R1 - Core1 - iBGP - Edge1 - IX
   X   |
R2 - Core2 - iBGP - Edge2 - IX

I'm currently wondering what the best practice is for aggregating routes. Should I aggregate at the core or at the edge?

Hoping for your insights.

Best Regards,
Blitz

[Giuseppe Larosa]

Hello @blitzperf ,

are the Edge1, Edge2 routers also running OSPF or only BGP with iBGP sessions with the core routers ?

if Edge1 and Edge2 are running only BGP, core01 and core02 have to advertise OSPF learned routes to Edgex.

And where is NAT performed ? on the Edge devices ?

Hope to help

Giuseppe

[blitzperf]

Hello @Giuseppe Larosa ,

Apologies for the late revert.

Edge1 and Edge2 are only running iBGP sessions with the core routers. 

Yes, NAT is performed on the Edge devices.

Best regards,

Blitz