[c-nsp] BGP community and MP-BGP route-target

[Mark Tinka]

On Saturday 07 March 2009 11:41:51 pm Tim Durack wrote:

> I guess what I'm asking is: Do AS:nn BGP communities and
> AS:nn MP-BGP route-targets share the same
> "community-space"?

No they don't.

VRF RT's are part of the extended communities definition 
which support a 64-bit value, and would appear only on the 
routes associated with that particular VRF or per your 
configuration.

Assuming your garden-variety IP network, standard 
communities support 32-bit values and would generally apply 
to routes in your global routing table.

Having said that, it is possible to attach both standard and 
extended communities to a route. In such a case, the router 
would handle each type of community per their individual RFC 
specifications.

Cheers,

Mark.
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