Re: [Softwires] Working group last call for draft-ietf-softwire-map-dhcp-07

Tom Taylor <tom.taylor.stds@gmail.com> Wed, 23 April 2014 18:52 UTC

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Date: Wed, 23 Apr 2014 14:52:05 -0400
From: Tom Taylor <tom.taylor.stds@gmail.com>
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To: Ole Troan <ot@cisco.com>, Ian Farrer <ianfarrer@gmx.com>
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Cc: Softwires WG <softwires@ietf.org>, Yong Cui <cuiyong@tsinghua.edu.cn>
Subject: Re: [Softwires] Working group last call for draft-ietf-softwire-map-dhcp-07
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On 23/04/2014 9:47 AM, Ole Troan wrote:
> Ian,
>
> thanks!
>
>> [ian] Couple of changes to 4.5:
>>
>> Old:
>> The Port Parameters Option specifies optional Rule Port Parameters
>>    that MAY be provided as part of the Mapping Rule for CEs using the
>>    MAP algorithm.
>> New:
>> The Port Parameters Option specifies optional Port Set information
>>    that MAY be provided to CEs.
>
> that looks fine.
>
>> Old:
>> When receiving the Port Parameters option with an explicit PSID, the
>>    client MUST use this explicit PSID in configuring its MAP interface.
>>    If the conveyed IPv4 address is not 32 bit-long, the option MUST be
>>    discarded.  The formula for this check is "prefix4-len + ea-len = 32"
>>    and serves to ensure that the explicit PSID is only applied to
>>    configurations with a completely formed IPv4 address.
>> New:
>> On receipt of the Port Parameters option with an explicit PSID, clients
>>    MUST configure their softwire interface with the received
>>    explicit PSID. For MAP-E and MAP-T clients, if the conveyed IPv4 address
>>    is not 32 bits-long, the option MUST be discarded.  The formula for
>>    this check is "prefix4-len + ea-len = 32" and serves to ensure that
>>    the explicit PSID is only applied to configurations with a completely
>>    formed IPv4 address.
>
> what about keeping the old text with your change of s/MAP interface/softwire interface/.
> at least in theory LW46 could support IPv4 prefixes, or a new mechanism could come along that did.
>
>> [ian]
>> What about the following wording change:
>> Old:Allowed values are between 0 and 15, with the default value being 6.
>> New:
>> Allowed values are between 0 and 15. Default values for this field are specific to the softwire mechanism being implemented and  are defined in the relevant specification document.
>
> that looks fine. updated.
>
>> Good spot on the WKP exclusion. Before the lw4o6 draft was updated to reference map-dhcp for configuration,  the port configuration was described in sun-dhc-port-set-option, which also stated that the WKPs should not be assigned. This advice got lost when changing to reference map-dhcp. I’ll make a suggested text update for the lw4o6 draft to fix this. Does that work for you?
>
> yes, that would be good.
>
> cheers,
> Ole
>
On the WKP exclusion, you might point people to the last paragraph of 
Appendix B.1 in draft-ietf-softwire-map.

Tom