Re: [OSPF] [Isis-wg] Mail regarding draft-ietf-ospf-segment-routing-extensions

Shraddha Hegde <shraddha@juniper.net> Mon, 29 December 2014 08:15 UTC

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From: Shraddha Hegde <shraddha@juniper.net>
To: Peter Psenak <ppsenak@cisco.com>, "draft-ietf-ospf-segment-routing-extensions@tools.ietf.org" <draft-ietf-ospf-segment-routing-extensions@tools.ietf.org>, "draft-ietf-isis-segment-routing-extensions@tools.ietf.org" <draft-ietf-isis-segment-routing-extensions@tools.ietf.org>
Thread-Topic: [Isis-wg] Mail regarding draft-ietf-ospf-segment-routing-extensions
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Date: Mon, 29 Dec 2014 08:15:09 +0000
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Subject: Re: [OSPF] [Isis-wg] Mail regarding draft-ietf-ospf-segment-routing-extensions
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Peter,

If there is a service which has to use un-protected path and while building such a path if the node-sids 
Need to be used (one reason could be label stack compression) , then there has to be unprotected node-sid that
this service can make use of. 

Prefix -sids could also be used to represent different service endpoints which makes it even more relevant to have 
A means of representing  unprotected paths.

Would be good to hear from others on this, especially operators.

Rgds
Shraddha


-----Original Message-----
From: Peter Psenak [mailto:ppsenak@cisco.com] 
Sent: Monday, December 29, 2014 1:35 PM
To: Shraddha Hegde; draft-ietf-ospf-segment-routing-extensions@tools.ietf.org; draft-ietf-isis-segment-routing-extensions@tools.ietf.org
Cc: ospf@ietf.org; isis-wg@ietf.org
Subject: Re: [Isis-wg] Mail regarding draft-ietf-ospf-segment-routing-extensions

Shraddha,

node-SID is advertised by the router for the prefix that is directly attached to it. Protection for such local prefix does not mean much.

thanks,
Peter

On 12/24/14 11:57 , Shraddha Hegde wrote:
> Authors,
> We have a "backup flag" in adjacency sid to indicate whether the label 
> is protected or not.
> Similarly. I think we need a flag in prefix-sid as well to indicate 
> whether the node-sid is to be protected or not.
> Any thoughts on this?
> Rgds
> Shraddha
>
>
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