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Re: [sfc] TTL field within the NSH base header

Jim Guichard <jguichard1966@gmail.com> Thu, 27 April 2017 20:40 UTC

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From: Jim Guichard <jguichard1966@gmail.com>
Date: Thu, 27 Apr 2017 20:37:23 +0000
Message-ID: <CAJn5=KcxP8R7wBWuUohAnhHP9tKqsV+QfQHVAsOVXcpu10tdoQ@mail.gmail.com>
To: "Andrew G. Malis" <agmalis@gmail.com>, James N Guichard <james.n.guichard@huawei.com>
Cc: "sfc@ietf.org" <sfc@ietf.org>
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Subject: Re: [sfc] TTL field within the NSH base header
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Yes but I also counted the other 3 bits that were reserved and are now
allocated..

On Thu, Apr 27, 2017 at 4:25 PM Andrew G. Malis <agmalis@gmail.com> wrote:

> Jim,
>
> The replacement text says:
>
>    There are eight reserved bits in the NSH Base Header. New bits
>
>    are assigned via Standards Action [RFC5226].
>
> There are now actually five reserved bits.
>
> Cheers,
> Andy
>
>
> On Thu, Apr 27, 2017 at 2:54 PM, James N Guichard <
> james.n.guichard@huawei.com> wrote:
>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> Dear WG:
>>
>>
>>
>>
>>
>> Having reviewed all of the email discussion on the mailing list it
>> appears to the chairs that we have consensus to add a TTL field to the NSH
>> base header. We would like to propose the following changes:
>>
>>
>>
>>
>>
>> Section 3.2:
>>
>>
>> Update figure 2 as follows:
>>
>>
>>
>>
>>
>>      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
>>
>>
>>     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>>
>>
>>     |Ver|O|R|    TTL    |   Length  |R|R|R|R|MD Type| Next Protocol |
>>
>>
>>     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>>
>>
>>
>>
>>
>> Add the following text after figure 2:
>>
>>
>>
>>
>>
>> TTL: Service plane time-to-live. An SFF MUST decrement the TTL by a value
>> of 1 for all NSH packets it receives. Decrementing by a value of 1 from 0
>> shall result in a TTL value of 63. The default for originating an NSH
>> packet is a TTL value
>>
>> of 63. The decrement SHALL occur before testing for 0. After decrement,
>> if the TTL is 0, the NSH packet MUST NOT be forwarded.
>>
>>
>>
>>
>>
>> Section 3.4:
>>
>>
>> Update figure 4 to reflect the new base header format as per section 3.2
>> base header.
>>
>>
>>
>>
>>
>> Section 3.5:
>>
>>
>> Update figure 5 to reflect the new base header format as per section 3.2
>> base header.
>>
>>
>>
>>
>>
>> Section 12.2.1:
>>
>>
>> Current text is as follows:
>>
>>
>>
>>
>>
>>    There are ten bits at the beginning of the NSH Base Header.  New bits
>>
>>
>>    are assigned via Standards Action [RFC5226].
>>
>>
>>
>>
>>
>>    Bits 0-1 - Version
>>
>>
>>    Bit 2 - OAM (O bit)
>>
>>
>>    Bit 3 - Critical TLV (C bit)
>>
>>
>>    Bits 4-9 - Reserved
>>
>>
>>
>>
>>
>> Replace entire text as follows:
>>
>>
>>
>>
>>
>>    There are eight reserved bits in the NSH Base Header. New bits
>>
>>
>>    are assigned via Standards Action [RFC5226].
>>
>>
>>
>>
>>
>>    Bits 0-1 - Version
>>
>>
>>    Bit 2 - OAM (O bit)
>>
>>
>>    Bit 3 - Reserved
>>
>>
>>    Bits 16-19 - Reserved
>>
>>
>>
>>
>>
>> Section 12.2.3:
>>
>>
>> Current text has the MD-type as 8-bit values.
>>
>>
>>
>>
>>
>> Update text for this section and table 1 to reflect 4-bit values *not*
>> 8-bit values.
>>
>>
>>
>>
>>
>> *Please review carefully and indicate support for these changes (or any
>> changes to the suggested text).*
>>
>>
>>
>>
>>
>> Thanks,
>>
>>
>>
>>
>>
>> Jim & Joel
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
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>>
>>
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>>
>>
>> _______________________________________________
>>
>>
>> sfc mailing list
>>
>>
>> sfc@ietf.org
>>
>>
>> https://www.ietf.org/mailman/listinfo/sfc
>>
>>
>>
>>
>
>
> _______________________________________________
>
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>
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