Re: [Idr] Progressing draft-bhatia-bgp-multiple-next-hops-01.txt

[Paul Jakma <paul at clubi.ie>]

On Thu, 24 Aug 2006, Enke Chen wrote:

> The update sequence described by Manav is the following:

Ah, I missed the unfeasible's in my quoting somehow.

> UPDATE: feasible nlri X, next_hop N1, <other attributes>

This would implicitely withdraw all previously advertised paths for 
the NLRI (as it does for BGP today). And announces (X,N1).

RIB under X:

	N1: <attributes>

> UPDATE: feasible nlri X, multiple_hop N2, <other attributes>

This adds the path of (X,N2). (No 'traditional' next-hop, no implicit 
withdraw).

RIB under X:

	N1: .....
	N2: .....

> UPDATE: unfeasible nlri X, multiple_hop N1
> UPDATE: unfeasible nlri X, multiple_hop N2

Explicit withdraw of (X,N1) and (X,N2)

> UPDATE: feasible nlri X, multiple_hop N11, <other attributes>
> UPDATE: feasible nlri X, multiple_hop N12, <other attributes>

Advertisements of (X,N11) and (X,N12).

There is no particular ordering requirement between the withdrawals 
of (X,N1) and (X,N2), and the advertisement of (X,N11) and (X,N12).

Additionally, advertisements of paths for an NLRI whose attributes 
are all the same, next-hop excepted, can be sent together in the same 
UPDATE (as an opportunistic optimisation, same as with different 
NLRIs but same attrs).

> You seem to be talking about a different approach. Could you detail the 
> sequence of updates?

See above. :)

regards,
--
Paul Jakma	paul at clubi.ie	paul at jakma.org	Key ID: 64A2FF6A
Fortune:
I found Rome a city of bricks and left it a city of marble.
		-- Augustus Caesar

_______________________________________________
Idr mailing list
Idr at ietf.org
https://www1.ietf.org/mailman/listinfo/idr