[isp-bgp] Re: bgp + multicast question

[Kamil Sarac <ksarac@...>]

 Hello all,

 I need your help in understanding one issue on multicast and MBGP
 interaction. In summary, MBGP allows us to have route announcements
 for unicast and for multicast seperately. That is, if I want to
 announce a prefix as multicast reachable only, MBGP provides the
 necessary support to do that by using MP_REACH_NLRI attribute.

 Now, let's say that I use this mechanism to announce a prefix as being
 multicast reachable only to a neighboring AS (nAS). On receiving this
 new route, the BGP router in nAS will want to inform other
 intra-domain routers about this new route. But at this point, the
 BGP router needs to pay attention to the fact that the incoming route
 information is for multicast reachability only. My question is: is
 there any way that the BGP router can include this information when it
 passes the route information to other routers in the domain? Is there
 any mechanism for intra-domain routers to differentiate route
 information for remote prefixes as being "unicast route" and
 "multicast route"?

 I am not sure if the question is clear enough but I will highly
 appreciate your help in understanding this issue.

 Thanks in advance.

 Kamil Sarac.








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