Re: [mpls] working group adaption poll (wgap) for draft-hegde-mpls-spring-epe-oam

Loa Andersson <loa@pi.nu> Wed, 13 May 2020 09:29 UTC

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From: Loa Andersson <loa@pi.nu>
To: "Ketan Talaulikar (ketant)" <ketant@cisco.com>, "draft-hegde-mpls-spring-epe-oam@ietf.org" <draft-hegde-mpls-spring-epe-oam@ietf.org>
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Date: Wed, 13 May 2020 17:29:00 +0800
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Subject: Re: [mpls] working group adaption poll (wgap) for draft-hegde-mpls-spring-epe-oam
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Folks,

I don't tink this came through properly

/Loa

On 13/05/2020 15:12, Loa Andersson wrote:
> Ketan,
> 
> For me there is a bit of procedural issue in this, changing the draft at
> this stage would require a new wgap.
> 
> Would it be sufficient that the working group chairs and the authors 
> acknowledge that the issues you pointed out, including "diverging from
> the control plane protocol semantics for what constitutes the FEC"
> exists, and that all the issues you point out will be addressed as part 
> of the working group process?
> 
> Authors,
> 
> You obviously need to chime in on this.
> 
> /Loa
> 
> On 13/05/2020 12:08, Ketan Talaulikar (ketant) wrote:
>> Hi  Loa,
>>
>> There is no doubt about the need for LSP ping and traceroute 
>> operations to cover BGP EPE SIDs. So the requirement is real and 
>> something that the WG should be taking up.
>>
>> My concerns is that the proposal in the draft is diverging from the 
>> control plane protocol semantics for what constitutes the FEC (or 
>> context) and how it is to be validated. These are some core aspects 
>> that IMHO need to be addressed before adoption while the rest may be 
>> taken up during its life as a WG document. I would suggest to wait for 
>> the authors response.
>>
>> Thanks,
>> Ketan
>>
>> -----Original Message-----
>> From: Loa Andersson <loa@pi.nu>
>> Sent: 13 May 2020 09:22
>> To: Ketan Talaulikar (ketant) <ketant@cisco.com>om>; 
>> draft-hegde-mpls-spring-epe-oam@ietf.org
>> Cc: mpls-chairs@ietf.org; mpls@ietf.org
>> Subject: Re: [mpls] working group adaption poll (wgap) for 
>> draft-hegde-mpls-spring-epe-oam
>>
>> Ketan,
>>
>> Anything of this that need to addressed before wg adoption?
>>
>>
>> Authors
>>
>> I leave the wgap opeb a few extra days to llow you to respond to this.
>>
>>
>> /Loa
>>
>> On 12/05/2020 23:32, Ketan Talaulikar (ketant) wrote:
>>> Hello Authors,
>>>
>>> I have the following comments on this draft and would be good if you 
>>> could clarify/respond.
>>>
>>> 1)The FEC description should match the "context" that is advertised in
>>> the control plane for Peer Adj SID. E.g. the local/remote Interface
>>> IDs are not being included from
>>> https://tools.ietf.org/html/draft-ietf-idr-bgpls-segment-routing-epe-1
>>> 9#section-4.2
>>>
>>> 2) For the Peer Node SID, the control plane definition is 
>>> https://tools.ietf.org/html/draft-ietf-idr-bgpls-segment-routing-epe-19#section-4.1 
>>> and the FEC description in this draft is not aligned with the 
>>> corresponding control plane. The Peer Node SID is meant for the 
>>> packet to be delivered to a specific BGP peer and it does not matter 
>>> over which interface it is received. So why have those interface 
>>> addresses as mandatory in the FEC. The only thing the control plane 
>>> indicates is the peering session itself.
>>>
>>> 3) Same as (2) above, for the Peer Set SID, the interfaces are don't 
>>> care.
>>>
>>> 4) The draft just says that the procedures are borrowed from RFC8287 
>>> but I don't think this is so straightforward or trivial. E.g. 
>>> https://tools.ietf.org/html/rfc8287#section-7.2 has the following:
>>>
>>>      The network node that is immediately downstream of the node that
>>>      advertised the Adjacency Segment ID is responsible for 
>>> generating the
>>>      FEC Stack Change sub-TLV for POP operation for the Adjacency 
>>> Segment
>>>      ID.
>>>
>>> In the case of IGPs, the downstream node does have the label and 
>>> context for adjacency SID (which is functionally closest to BGP EPE 
>>> SIDs). In the BGP-EPE SIDs case, this is not always the case. So I 
>>> believe, it would be better if the entire operation were described.
>>>
>>> 5) The ping or traceroute done to any of the BGP EPE SID 
>>> corresponding to an eBGP session may result in the packet being sent 
>>> to another entity. The security consideration talk about it, but the 
>>> problem is not addressed by the remote AS dropping the packets. The 
>>> security issue is that the OAM packet could expose the FECs and 
>>> information of the local AS to a remote AS. So it is more as an 
>>> caveat for the operators performing the OAM operation to be mindful 
>>> of this fact.
>>>
>>> In general, some more description that set the stage for the 
>>> introduction of the new extensions and elaborate more on the 
>>> operations (some considerations above on what is mandatory to 
>>> evaluate and what is optional).
>>>
>>> Thanks,
>>> Ketan
>>>
>>> -----Original Message-----
>>> From: mpls <mpls-bounces@ietf.org> On Behalf Of Loa Andersson
>>> Sent: 30 April 2020 08:26
>>> To: mpls@ietf.org
>>> Cc: mpls-chairs@ietf.org; draft-hegde-mpls-spring-epe-oam@ietf.org
>>> Subject: [mpls] working group adaption poll (wgap) for
>>> draft-hegde-mpls-spring-epe-oam
>>>
>>> Working Group,
>>>
>>> This is to start a two week poll on adopting 
>>> draft-hegde-mpls-spring-epe-oam as a MPLS working group document.
>>>
>>> Please send your comments (support/not support) to the mpls working 
>>> group mailing list (mpls@ietf.org). Please give a technical 
>>> motivation for your support/not support, especially if you think that 
>>> the document should not be adopted as a working group document.
>>>
>>> There is one IPR disclosure against this document.
>>>
>>> The authors have stated on the MPLS wg mailing list that they are 
>>> unaware of any IPRs that relates to this document.
>>>
>>> The working group adoption poll ends May 15, 2020.
>>>
>>> /Loa
>>>
>>
> 

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Loa Andersson                        email: loa@pi.nu
Senior MPLS Expert
Bronze Dragon Consulting             phone: +46 739 81 21 64