Re: [secdir] secdir review of draft-ietf-isis-genapp

Radia Perlman <radiaperlman@gmail.com> Mon, 09 August 2010 23:34 UTC

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Date: Mon, 9 Aug 2010 16:34:50 -0700
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From: Radia Perlman <radiaperlman@gmail.com>
To: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
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Cc: secdir@ietf.org, draft-ietf-isis-genapp@tools.ietf.org, iesg@ietf.org
Subject: Re: [secdir] secdir review of draft-ietf-isis-genapp
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Well, I think it would be good to repeat saying "Scope"and "Down" in
this document, and try to think of some words that start with "I" and
"V" that make some sense in the context of how those flags are used,.

Radia



On Mon, Aug 9, 2010 at 4:15 PM, Les Ginsberg (ginsberg)
<ginsberg@cisco.com> wrote:
> Radia -
>
> The use of "D" and "S" is copied from RFCs 4971/5305. The initials were
> not further identified there and we used identical text in describing
> them. (That's my excuse anyway)
>
> As a point of information:
>
> "S" - flooding "Scope"
> "D" - Indicates the TLV has been leaked "Down" from Level2 to level1
>
> The choice of the letters "I" and "V" was arbitrary.
>
>   Les
>
>> -----Original Message-----
>> From: Radia Perlman [mailto:radiaperlman@gmail.com]
>> Sent: Monday, August 09, 2010 2:58 PM
>> To: draft-ietf-isis-genapp@tools.ietf.org; iesg@ietf.org;
>> secdir@ietf.org
>> Subject: secdir review of draft-ietf-isis-genapp
>>
>> This document is about using the reliable flooding mechanism of IS-IS
>> to advertise information for applications unrelated to IS-IS in a way
>> that doesn't use up "T" values in the TLV encoding.
>>
>> So, since it's just syntax, there really aren't any security
>> considerations.
>>
>> It would have been nice if the authors explained what "V" "I" "D" and
>> "S" mean in the context of the flags, as in, what word is "V" the
>> first letter of, what word is "I" the first letter of...
>>
>> Unless I missed it in the spec, the authors just give rules like:
>>
>>                  D bit (0x02): When the GENINFO TLV is leaked from
>>                  level-2 to level-1, the D bit MUST be set. Otherwise
>>                  this bit MUST be clear. GENINFO TLVs with the D bit
>> set
>>                  MUST NOT be leaked from level-1 to level-2. This is
> to
>>                  prevent TLV looping.
>>
>>                  I bit (0x04): When the I bit is set the 4 octet IPv4
>>                  address associated with the application immediately
>>                  follows the Application ID.
>>
>> Radia
>