The MPLS-OPS Archive

["Jim Guichard" <jguichar@cisco.com>]

Cisco has prefix-list ORF currently but as yet no extended-community ORF ..
Jim

> >-----Original Message-----
> >From: Joe Lin [mailto:jlin@doradosoftware.com]
> >Sent: Thursday, May 16, 2002 3:57 PM
> >To: 'Yakov Rekhter'; 'Jim Guichard'
> >Cc: mpls-ops@mplsrc.com
> >Subject: RE: [MPLS-OPS]: Fwd: Re: Why martini over kompella
> >
> >
> >Has anyone implemented ORFs yet?
> >
> >Last time that was discussed no vendor has done it...
> >
> >
> >-----Original Message-----
> >From: Yakov Rekhter [mailto:yakov@juniper.net]
> >Sent: Thursday, May 16, 2002 6:13 AM
> >To: Jim Guichard
> >Cc: mpls-ops@mplsrc.com
> >Subject: Re: [MPLS-OPS]: Fwd: Re: Why martini over kompella
> >
> >Jim,
> >
> >> One point to add below ..
> >
> >likewise, I have one point to add as well :-)
> >
> >[clipped...]
> >
> >> > >>So, why BGP instead of LDP?  BGP does auto-discovery; LDP doesn't.
> >> > >>This makes a huge difference to the task of provisioning VPNs.
> >> > >>
> >> > >>BGP is also better suited to building largish VPNs -- with LDP,
> >the
> >> > >>protocol state maintained in the network, the number of targeted
> >LDP
> >> > >>sessions, etc. all get pretty large pretty quickly [O(N**2)].
> >With
> >> > >>BGP, the protocol state in the network is O(N); and one can use
> >route
> >> > >>reflectors and/or confeds to keep the number of sessions at O(N).
> >> > >>Finally, if one is interested in building inter-AS/inter-provider
> >> > >>VPNs, BGP is a clear winner.
> >>
> >> I do not think that this is comparing apples to apples - directed LDP
> >has to
> >> distribute information to a particular endpoint for a given attachment
> >VC
> >> whereas BGP wants, by default, to distribute the information to
> >everyone. So
> >> although there will be a larger number of directed LDP sessions than
> >BGP
> >> sessions (with RRs), the amount of information that must be carried by
> >the
> >> directed LDP sessions is by no means the same as BGP sessions. This
> >means
> >> that the scaling implications are not the same as with BGP. Jim
> >
> >To avoid distributing the information to everyone one can use BGP
> >Outbound Route Filters (ORFs). And with ORFs the amount of information
> >that one needs to carry over BGP is comparable to the amount of
> >information one would need to carry over the directed LDP session.
> >
> >Yakov.
> >
> >P.S. For more details on ORF one may look at
> >draft-ietf-idr-route-filter-06.txt.
> >
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