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Re: [mpls] [bess] draft-rosen-mpls-rfc3107bis

Eric C Rosen <erosen@juniper.net> Tue, 05 April 2016 13:28 UTC

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To: Robert Raszuk <robert@raszuk.net>
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From: Eric C Rosen <erosen@juniper.net>
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Cc: "mpls@ietf.org" <mpls@ietf.org>, BESS <bess@ietf.org>, "idr@ietf.org" <idr@ietf.org>
Subject: Re: [mpls] [bess] draft-rosen-mpls-rfc3107bis
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On 4/5/2016 8:05 AM, Robert Raszuk wrote:
> Wouldn't it be more flexible to simply define new attribute to carry  > the stack within any SAFI as an opaque to BGP data ? That way one 
can > easily use it in unicast SAFI or even in FlowSpec.

That can be done with the Tunnel Encapsulation attribute.  Look at, for 
example, at draft-previdi-idr-segment-routing-te-policy (though I think 
that document still needs quite a bit of work).

> If as it turns out if the primary motivation for 3107bis is to  > distribute label stack for segment routing

3107bis fixes a number of problems in 3107, and it also specifies how to 
use the "multiple labels" feature without tickling known bugs in 
existing deployments.   One could argue about whether this is the best 
tool for various segment routing applications, but that's outside the 
scope of the draft.  And there are use cases that have nothing to do 
with segment routing; see, e.g., the discussion of context labels in 
section 4.

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