Re: [OSPF] WG Adoption Poll for "Using Operator-defined TLVs for Agile Service Deployment"

"Les Ginsberg (ginsberg)" <ginsberg@cisco.com> Thu, 17 March 2016 04:40 UTC

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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
To: "Acee Lindem (acee)" <acee@cisco.com>, OSPF WG List <ospf@ietf.org>
Thread-Topic: WG Adoption Poll for "Using Operator-defined TLVs for Agile Service Deployment"
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Date: Thu, 17 Mar 2016 04:40:30 +0000
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Subject: Re: [OSPF] WG Adoption Poll for "Using Operator-defined TLVs for Agile Service Deployment"
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My opinion of the draft has not changed.

It is defining a way to utilize OSPF to send application information - which is not something the protocol should be used to do.
Further, it leaves definition of the new codepoints and formats of the information advertised completely unspecified - the latest draft revision states:

" The meaning of the operator-defined sub-TLV is totally opaque to OSPF
   and is defined by the network local policy and is controlled via
   configuration.  "

How interoperability is achieved is not addressed at all.

IS-IS has taken a much more stringent approach to a similar request. 	
RFC 6823 (GENAPP) requires that information sent in the generic container TLV MUST be based on a public specification - and that an application specific ID for the application using this mechanism be assigned by IANA. This addresses the interoperability issue.
GENAPP further specifies that such information SHOULD be advertised by a separate instance of the routing protocol (as specified in RFC 6822(MI)) so as to minimize the impact of the application information flooding on the performance of the routing protocol.

Without addressing both of these issues I cannot support the draft.

   Les


> -----Original Message-----
> From: OSPF [mailto:ospf-bounces@ietf.org] On Behalf Of Acee Lindem
> (acee)
> Sent: Wednesday, March 16, 2016 7:09 PM
> To: OSPF WG List
> Subject: [OSPF] WG Adoption Poll for "Using Operator-defined TLVs for Agile
> Service Deployment"
> 
> We’ve discussed this draft a number of times. In my opinion, it seems like a
> useful mechanism if one envisions a generalized API between OSPF and user
> and third-party applications to convey application-specific information
> learned from other OSPF routers. In many respects, this has already been
> envisioned for OSPF Node Tags. Please indicate your opinion on this draft
> before March 31st, 2016.
> 
> Thanks,
> Acee
> 
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