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

"Ketan Talaulikar (ketant)" <ketant@cisco.com> Tue, 12 May 2020 15:33 UTC

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From: "Ketan Talaulikar (ketant)" <ketant@cisco.com>
To: "draft-hegde-mpls-spring-epe-oam@ietf.org" <draft-hegde-mpls-spring-epe-oam@ietf.org>
CC: "mpls-chairs@ietf.org" <mpls-chairs@ietf.org>, Loa Andersson <loa@pi.nu>, "mpls@ietf.org" <mpls@ietf.org>
Thread-Topic: [mpls] working group adaption poll (wgap) for draft-hegde-mpls-spring-epe-oam
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Date: Tue, 12 May 2020 15:32:55 +0000
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Subject: Re: [mpls] working group adaption poll (wgap) for draft-hegde-mpls-spring-epe-oam
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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-19#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
-- 

My mail server it under a DOS attack, we are working to fix it but it may take some time.


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

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