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Re: [Teas] Suresh Krishnan's Discuss on draft-ietf-teas-gmpls-scsi-03: (with DISCUSS)

Daniele Ceccarelli <daniele.ceccarelli@ericsson.com> Tue, 22 August 2017 09:44 UTC

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From: Daniele Ceccarelli <daniele.ceccarelli@ericsson.com>
To: Suresh Krishnan <suresh.krishnan@gmail.com>
CC: The IESG <iesg@ietf.org>, "draft-ietf-teas-gmpls-scsi@ietf.org" <draft-ietf-teas-gmpls-scsi@ietf.org>, Vishnu Beeram <vbeeram@juniper.net>, "teas-chairs@ietf.org" <teas-chairs@ietf.org>, "teas@ietf.org" <teas@ietf.org>
Thread-Topic: Suresh Krishnan's Discuss on draft-ietf-teas-gmpls-scsi-03: (with DISCUSS)
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Date: Tue, 22 Aug 2017 09:44:37 +0000
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Subject: Re: [Teas] Suresh Krishnan's Discuss on draft-ietf-teas-gmpls-scsi-03: (with DISCUSS)
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Hi Suresh,

sorry for the delay in answering.
I modified the text as follows: 

        The Generalized SCSI is composed of zero or more variable length
        type-length-value fields which are each called a SCSI-TLV.
        There are no specific size restrictions on these SCSI-TLV.  Size
        and other formatting restrictions may be imposed by the routing
        protocol ISCD field, refer to <xref target="RFC4203"/> and <xref
        target="RFC5307"/>. Please also refer to <xref target="RFC3630"/> for
        the treatment of malformed Link TLVs.

How to manage malformed Link TLVs is already described in RFC3630.

Thanks
Daniele  


-----Original Message-----
From: Suresh Krishnan [mailto:suresh.krishnan@gmail.com] 
Sent: giovedì 3 agosto 2017 16:06
To: Daniele Ceccarelli <daniele.ceccarelli@ericsson.com>
Cc: The IESG <iesg@ietf.org>; draft-ietf-teas-gmpls-scsi@ietf.org; Vishnu Beeram <vbeeram@juniper.net>; teas-chairs@ietf.org; teas@ietf.org
Subject: Re: Suresh Krishnan's Discuss on draft-ietf-teas-gmpls-scsi-03: (with DISCUSS)

Hi Daniele,

> On Aug 3, 2017, at 4:21 AM, Daniele Ceccarelli <daniele.ceccarelli@ericsson.com> wrote:
> 
> Hi Suresh,
> 
> The GMPLS SCSI is a sub-TLV of the ISCD (interface switching capability descriptor-RFC4203), which in turn is a sub TLV of the Link TLV (RFC3630) ... yes we like nesting in GMPLS 😊
> 
> RFC 3630 (section 2.4.2.) says: " Unrecognized sub-TLVs are ignored."
> 
> It seems obvious but it took me a while to go back to the root of the problem, hence few words  would help the reader. How about something along the lines of:
> 
> "Malformed packets should be treated accordingly with error handling procedures defined in RFC3630.” ?

…

> 
> Re-reading the draft it seems it's already covered by this statement:
> 
> "Size and other formatting restrictions may be imposed by the routing
>        protocol ISCD field, refer to <xref target="RFC4203"/> and <xref
>        target="RFC5307"/>."
> 
> Would you like it to be made more explicit?

Yes. Please. I personally think ignoring a length error as an unrecognized TLV and moving on is not preferable, but I am happy to step aside if that decision is explicitly made.

Regards
Suresh

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