How to connect iBGP over eBGP

[wabob]

I am trying to duplicate a production environment in a lab. The "remote site" router is BGP AS 65001, it has a neighborship with a router in the "cloud" that is BGP AS 12345 (not actual), then the other end of the "cloud" is adjacent to the "HQ" router which is also BGP AS 65001.

In the actual production environment, the subnets at the remote sites appear in the routing table of the HQ router with an Administrative Distance of 20, like they were learned via eBGP, when they are the same (private) Autonomous System.

Any ideas on how I can duplicate this?

 

[unclerico]

look into the as-override command in the BGP config, it will permit you to run the same ASN at multiple locations.

I hate all Uppercase... I don't want my groups to seem angry at me all the time! =)
- ColdFlame (vbscript forum)

 

[wabob]

Would as-override be configured on the "cloud" router only, with the two AS 65001 neighbors?

 

[unclerico]

yes, it is configured on the PE device(s). you could also look at using the allowas-in command

I hate all Uppercase... I don't want my groups to seem angry at me all the time! =)
- ColdFlame (vbscript forum)

 

[wabob]

I used the neighbor x.x.x.x allowas-in command on the AS 65001 routers on both sides of the "cloud", now they are exchanging routes via eBGP. This was the result I wanted.

Thanks for the idea!



Ross Perot was right...

 

[unclerico]

good deal

I hate all Uppercase... I don't want my groups to seem angry at me all the time! =)
- ColdFlame (vbscript forum)