BGP additional-paths

Hi can anyone tell me how the bgp additional-paths select command works?

Hello Sushanth

The BGP Additional Paths feature allows the advertisement of multiple paths through the same peering session for the same prefix without the new paths implicitly replacing any previous paths.

Because BGP routers propogate only their best path over their sessions, any advertisement of a new prefix replaces the previous announcement of that prefix. This behaviour can achieve better scaling, but at the cost of path diversity. The BGP Additional Paths feature provides a way for multiple paths for the same prefix to be advertised without the new paths implicitly replacing the previous paths.

I hope this has been helpful!

Laz

HI,
Thanks and sorry for the late reply to you!

I need an scenario which i can understand even better. Could you please help me…

Hello Suhanth

This Cisco documentation includes some excellent examples of BPG additional paths. It includes some scenarios of some problems that are introduced with BGP that are solved by the use of the additional-paths feature.

I hope this has been helpful!

Laz

Hi Sushanth,

If you are still interested, I just published this:

Rene

Hi Rene,

Thanks for the update…

Can you explain in detail about how Prefix-suppression in OSPF works…

Hello Sushanth!

Take a look at the following lesson concerning prefix suppression in OSPF.


If you have any further questions about it, feel free to ask!

I hope this has been helpful!

Laz