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Confederation Question

Hi All,

If I am implementing BGP confederations within an iBGP AS, does every router in that iBGP AS need to belong to a Confederation/sub-AS?  Or can I have routers that are only in the overall iBGP AS?  If I can, when I peer them to a peer that belong to a Confederation, do I specify neighbor x.x.x.x remote-as <overall iBGP AS> or neighbor x.x.x.x remote-as <sub-AS>?

1 ACCEPTED SOLUTION

Accepted Solutions
Purple

Hi,You can't do this,

Hi,

You can't do this, specifying neighbor AS as subconfed AS will result in peering not completing and configuring neighbor as confederation AS will make the peering complete but as soon as you advertise a prefix in the subconfed and it is sent to the peer in the confed it will result in BGP notification and peering going down.

https://learningnetwork.cisco.com/thread/54877

 

Regards

 

Alain

Don't forget to rate helpful posts.
2 REPLIES
Purple

Hi,You can't do this,

Hi,

You can't do this, specifying neighbor AS as subconfed AS will result in peering not completing and configuring neighbor as confederation AS will make the peering complete but as soon as you advertise a prefix in the subconfed and it is sent to the peer in the confed it will result in BGP notification and peering going down.

https://learningnetwork.cisco.com/thread/54877

 

Regards

 

Alain

Don't forget to rate helpful posts.
New Member

Sounds good.  I thought that

Sounds good.  I thought that would be the case.

Thanks Alain.

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