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

Peter Psenak <ppsenak@cisco.com> Wed, 03 September 2014 10:32 UTC

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Date: Wed, 03 Sep 2014 12:32:24 +0200
From: Peter Psenak <ppsenak@cisco.com>
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To: bruno.decraene@orange.com, Rob Shakir <rjs@rob.sh>
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Subject: Re: [OSPF] Poll for WG adoption of draft-hegde-ospf-node-admin-tag
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Hi Bruno,

On 9/3/14 12:25 , bruno.decraene@orange.com wrote:
> Hi Peter, Rob,
>
> +1 on Rob's comment regarding the use of admin tag for expressing operator policy (rather than spec/feature capability)
>
> 1 point in lined below
>
>> From: Peter Psenak > Sent: Wednesday, September 03, 2014 10:21 AM
>>
>> Hi Rob,
>>
>> On 9/3/14 10:16 , Rob Shakir wrote:
>>> Hi Peter,
>>>
>>> On 3 Sep 2014, at 09:13, Peter Psenak <ppsenak@cisco.com> wrote:
>>>
>>>>> As per the above, I do not think that this mechanism replaces any
>> capability, it just gives an operator a means to be more granular than the
>> binary "supported"/"not supported" view that a flag indicating capabilities
>> does.
>>>>
>>>> I understand. My point was that admin tags should not be used in cases
>> where only a binary capability is signaled.
>>>
>>> ACK, I completely agree. Perhaps we should add something into the draft that the admin-tag should not be used for such a purpose.
>
>> I would certainly appreciate that.
>
> I agree as a general rule. Yet IMHO we should not kill this possibility. In particular for feature allowing incremental deployment & interaction with non-compliant nodes.
> One example would have been Remote LFA (RLFA):
> - the PLR (FRR node) needs to be RLFA compliant. Therefore (potential) communication between PLR regarding their capabilities can be done using IANA/implemented code point.
> - the PQ node (Merge Point) does not need to be RLFA compliant. And we should keep this property to ease incremental deployment. Therefore communication between PQ and PLR regarding PQ capabilities should/may be done using node tag.  RLFA spec could have defined an IANA registered node tag to be used by PQ (configured by the network operator) to exclude them as PQ candidate. e.g. for PQ node not accepting T-LDP session or nodes which should not be used as PQ per policy.

why is "IANA registered node tag" any better then IANA registered 
capability bit in the above case?

thanks,
Peter



>
> Thanks,
> Bruno
>
>>
>> thanks,
>> Peter
>>
>>>
>>> Cheers,
>>> r.
>>>
>>
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