Re: MPLS over L2TPv3 encap for RFC 2547 VPNs
Chris Lewis <chrlewis@cisco.com> Mon, 09 February 2004 15:18 UTC
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Date: Mon, 09 Feb 2004 09:10:55 -0600
To: Rahul Aggarwal <rahul@juniper.net>
From: Chris Lewis <chrlewis@cisco.com>
Subject: Re: MPLS over L2TPv3 encap for RFC 2547 VPNs
Cc: yakov@juniper.net, mpls@UU.NET, l3vpn@ietf.org
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Hi Rahul, At 04:53 AM 2/9/2004, Rahul Aggarwal wrote: >Hi Chris, > >On Fri, 6 Feb 2004, Chris Lewis wrote: > > > Hello Yakov, > > > > I saw your exchange with Mark below and want to offer an opinion. > > > > I agree that your question as to why BGP is better than L2TP signaling in > > this case is one worth asking. > > > > I believe that the answer is quite simple, however I would appreciate any > > further input on where this logic falls down. > > > > In this draft, Mark is not signaling pseudowire state. Rather a single > > piece of information that tells any other PE wanting to communicate with a > > given PE, what it's capabilities are, needs to be communicated throughout > > the domain. In this instance the same set of information needs to go to > >Not just capabilities. This information includes L2TPv3 signaling >information: session-id and cookie. If it's the same value that has to go to multiple peers, it seems to me that to broadcast it by BGP is a more efficient option. > > many peers and there is no exchange of pseudowire state involved. > > Essentially a point to multipoint conversation. > > > >Hence, shouldn't it be fine to generalize this draft to cover any >point-to-multipoint application of MPLS over L2TPv3 ? If you're referring to virtual routers in this definition of generalization, I don't have an opinion. Chris >rahul > > > To me it seems logical that using the BGP default behavior of broadcast is > > more efficient than using the behavior of L2TP, which is point to point in > > nature and forcing a replication of many L2TP point to point sessions, when > > a single BGP entry would do. > > > > > > > Does this make sense, or am I missing something? > > > > Cheers > > > > Chris > > > > To: "W. Mark Townsley" <townsley@cisco.com> > > cc: mpls@UU.NET, l3vpn@ietf.org > > Subject: Re: MPLS over L2TPv3 encap for RFC 2547 VPNs > > Date: Wed, 04 Feb 2004 11:55:08 -0800 > > From: Yakov Rekhter <yakov@juniper.net> > > Mark, > > > Yakov Rekhter wrote: > > > > > > > Please document in your draft what is exactly "prudent" about BGP. > > > > > > Using draft-ietf-l3vpn-ipsec-2547-01.txt as a guide: > > > > > > "RFC2547 already provides an egress-to-ingress signaling capability via > > BGP, > > > and we specify below how to extend this to the signalling of security > > policy." > > > > > > I will add this text to the l3vpn-l2tpv3 document: > > > > > > "RFC2547 already provides an egress-to-ingress signaling capability via > > BGP, > > > [NALAWADE] or [RAGGARWA] specifies how to extend this to the > signaling of > > > L2TPv3 reachability information for a PE." > > Sorry, but the analogy with draft-ietf-l3vpn-ipsec-2547-01.txt does > > not work. This is because draft-ietf-l3vpn-ipsec-2547-01.txt does > > *not* replace IPSec signaling with BGP. All it does is specifying > > how to use BGP to indicate whether a particular VPN on a PE should > > use IPSec to get traffic to that PE. > > In contrast your draft uses BGP not just to specify whether a > > particular VPN on a PE should use l2tp to get traffic to that PE, > > but also uses BGP to carry the l2tp session and cookie (l2tp signaling > > information). That is, in contrast to draft-ietf-l3vpn-ipsec-2547-01.txt > > your draft does replace the l2tp signaling protocol with BGP, thus > > eliminating the need for l2tp signaling with the l2tp signaling > > protocol. > > Just tell us why BGP signaling is any better than l2tp signaling. > > > >
- MPLS over L2TPv3 encap for RFC 2547 VPNs W. Mark Townsley
- Re: MPLS over L2TPv3 encap for RFC 2547 VPNs Yakov Rekhter
- Re: MPLS over L2TPv3 encap for RFC 2547 VPNs W. Mark Townsley
- RE: MPLS over L2TPv3 encap for RFC 2547 VPNs neil.2.harrison
- Re: MPLS over L2TPv3 encap for RFC 2547 VPNs Yakov Rekhter
- Re: MPLS over L2TPv3 encap for RFC 2547 VPNs Robert Raszuk
- RE: MPLS over L2TPv3 encap for RFC 2547 VPNs neil.2.harrison
- Re: MPLS over L2TPv3 encap for RFC 2547 VPNs W. Mark Townsley
- Re: MPLS over L2TPv3 encap for RFC 2547 VPNs Robert Raszuk
- Re: MPLS over L2TPv3 encap for RFC 2547 VPNs Eric Rosen
- Re: MPLS over L2TPv3 encap for RFC 2547 VPNs David Meyer
- Re: MPLS over L2TPv3 encap for RFC 2547 VPNs W. Mark Townsley
- Re: MPLS over L2TPv3 encap for RFC 2547 VPNs Yakov Rekhter
- Re: MPLS over L2TPv3 encap for RFC 2547 VPNs Yakov Rekhter
- Re: MPLS over L2TPv3 encap for RFC 2547 VPNs Gargi
- RE: MPLS over L2TPv3 encap for RFC 2547 VPNs richard.spencer
- Re: MPLS over L2TPv3 encap for RFC 2547 VPNs W. Mark Townsley
- Re: MPLS over L2TPv3 encap for RFC 2547 VPNs Chris Lewis
- Re: MPLS over L2TPv3 encap for RFC 2547 VPNs Rahul Aggarwal
- Re: MPLS over L2TPv3 encap for RFC 2547 VPNs Chris Lewis
- RE: MPLS over L2TPv3 encap for RFC 2547 VPNs richard.spencer