Re: [mpls] MPLS-RT review of draft-bryant-mpls-sfl-framework-04

Eric C Rosen <erosen@juniper.net> Fri, 19 May 2017 16:56 UTC

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To: "Bocci, Matthew (Nokia - GB)" <matthew.bocci@nokia.com>, Stewart Bryant <stewart.bryant@gmail.com>, "mpls@ietf.org" <mpls@ietf.org>, "draft-bryant-mpls-sfl-framework@ietf.org" <draft-bryant-mpls-sfl-framework@ietf.org>
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From: Eric C Rosen <erosen@juniper.net>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/mpls/ZF_wEKPDQjkJ4szXeeh2TbrLrcE>
Subject: Re: [mpls] MPLS-RT review of draft-bryant-mpls-sfl-framework-04
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On 5/19/2017 10:20 AM, Bocci, Matthew (Nokia - GB) wrote:
> One could envisage situations where duplicate flows are assigned the 
> same EL value but sent on different LSPs over the same path or subset 
> of a path.

I suppose that if two flows have different ingress nodes, they might by 
coincidence get assigned the same EL value.  then if their paths 
intersected downstream, the EL itself might not provide enough entropy.  
Is that the sort of situation you're thinking of?

Of course, if the EL is computed by the ingress as, say,  a hash of the 
TCP header, one could minimize the probability of that by including the 
ingress node's address (or even some random value) in the hash.