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Re: concerns about tunnels

Albert Tian <tian@redback.com> Mon, 27 September 2004 19:13 UTC

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Date: Mon, 27 Sep 2004 12:03:25 -0700
From: Albert Tian <tian@redback.com>
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To: Alia Atlas <aatlas@avici.com>
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Cc: Alex Zinin <zinin@psg.com>, rtgwg@ietf.org, Don Fedyk <dwfedyk@nortelnetworks.com>, mike shand <mshand@cisco.com>
Subject: Re: concerns about tunnels
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Hi, Alia,

Yes that is an issue needs to be solved, but it may not be as serious:

a) there are solutions that do not require LDP full mesh. For example,
draft-shen-mpls-ldp-nnhop-label-01.txt that would let you learn LDP next-nexthop
labels.

b) there are people who would not mind LDP full mesh.

Thanks,

Albert

Alia Atlas wrote:
> 
> The other complexity which any type of tunnel introduces is for additional
> protocols, such as LDP, which requires a label from the tunnel end-point.
> 
> With tunnels, X would need to maintain an LDP adjacency with every
> potential tunnel-endpoint Y, so that the labels are available.  If you go
> to a mechanism like the directed forwarding, then an adjacency would need
> to be maintained with every router to whom the traffic might be directed.
> 
> Since VPNs and pseudo-wires are a source of the traffic which needs better
> resiliency, this is a serious concern.
> 
> Alia
> 
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> Rtgwg@ietf.org
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