Re: [OSPF] Poll for WG adoption of draft-hegde-ospf-node-admin-tag

Hannes Gredler <hannes@juniper.net> Tue, 26 August 2014 15:32 UTC

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Date: Tue, 26 Aug 2014 17:32:01 +0200
From: Hannes Gredler <hannes@juniper.net>
To: Peter Psenak <ppsenak@cisco.com>
Message-ID: <20140826153201.GA6179@juniper.net>
References: <D0212051.2116%acee@cisco.com> <53FC3FD8.1000704@cisco.com> <D022049C.2295%acee@cisco.com> <53FC9A02.4080401@cisco.com>
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Subject: Re: [OSPF] Poll for WG adoption of draft-hegde-ospf-node-admin-tag
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hi peter,

operators want to assign node-tags as per router function (ABR, PE, core) and then
the LFA-selection becomes much easier to specify. - e.g.
- only pick a LFA that does not cross another PE router.

similarily it is desirable for "LFA tunnel termination" 
to put out a constraint which says
- only pick a PQ neighbor which has node tag 'X'

i found it always strange that we for TE (as an example for
constraining paths) we have got ways to tag links, but
not way to tag nodes - that draft aims to fix that.

HTH,

/hannes

On Tue, Aug 26, 2014 at 04:30:26PM +0200, Peter Psenak wrote:
| Hi Acee,
| 
| On 8/26/14 15:45 , Acee Lindem (acee) wrote:
| >Hi Peter,
| >This is a valid concern and one that we¹ve discussed previously with
| >respect to routing behavior based on policies. I think that accepting this
| >draft as a WG document should not preclude standardization of capabilities
| >advertisement for popular applications.
| 
| sure. Just that the draft mentions applications like "Controlling Remote LFA
| tunnel termination", which I'm not sure the node tag is the best approach
| for.
| 
| thanks,
| Peter
| 
| >Thanks,
| >Acee
| >
| >On 8/26/14, 4:05 AM, "Peter Psenak (ppsenak)" <ppsenak@cisco.com> wrote:
| >
| >>On 8/25/14 23:18 , Acee Lindem (acee) wrote:
| >>>There are situations where node level policy is required and an OSPF
| >>>advertised admin tag simplifies this. For example, advertisement of
| >>>remote-LFA eligibility.
| >>
| >>my concern with the generic use of admin tags for signaling capability
| >>is that it's operationally unfriendly compared to explicit signaling of
| >>the capability (e.g. using a bit or a TLV). The reason is that you have
| >>to configure the tag meaning on all receiving routers.
| >>
| >>thanks,
| >>Peter
| >>
| >>>
| >>>Please indicate your support or objections to adopting this draft as an
| >>>OSPF WG document.
| >>>
| >>>Thanks,
| >>>Acee
| >>>
| >>>
| >>>_______________________________________________
| >>>OSPF mailing list
| >>>OSPF@ietf.org
| >>>https://www.ietf.org/mailman/listinfo/ospf
| >>>
| >>
| >>_______________________________________________
| >>OSPF mailing list
| >>OSPF@ietf.org
| >>https://www.ietf.org/mailman/listinfo/ospf
| >
| >.
| >
| 
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