Re: wildcard flowid in framework PIB?

Hi Kwok.
I understood the use of setting the length to zero was for unsupported 
attributes. If the intention is to use this for wildcards, then why is 
there a distinct wildcard value indicated for the protocol and DSCP 
attributes?
/brian

Kwok Ho Chan wrote:

> Brian:
> Please see inline below.
> -- Kwok --
>
> At 11:54 AM 11/8/02 +1100, Brian Williams wrote:
>
>> Hi Kwok.
>> I still am not clear how you would indicate a value to match all 
>> FlowIDs, and hence the FlowId can be ignored. Please see further inline.
>> /brian
>>
>> Kwok Ho Chan wrote:
>>
>>> Brian, Emmanuel:
>>> We do not need wildcard for the frwkIpFilterFlowId attribute in the
>>> Framework PIB's frwkIpFilterEntry.
>>>
>>> The reasoning is as follows:
>>
>>
>> <snip>
>>
>>>>    If an IPv6 node is not providing flow-specific treatment, it MUST
>>>>    ignore the field when receiving or forwarding a packet.
>>>
>> I assume you are using this as the key point. What I am after is how 
>> you tell the node that it is not doing flow-specific treatment, and 
>> therefore the field can be ignored. That is, what do you send in the 
>> PIB to tell the node that the FlowId is not used? This is not case 1, 
>> 2, or 3 below.
>
>
> The encoding of the frwkIpFilterFlowId attribute can have a length of 
> zero, used to
> indicate the attribute is not used (please see COPS-PR RFC 3084).  
> Hence this
> is used to indicate this attribute is not used as part of the filter 
> definition and will
> not contribute to the filtering action, resulting in a "don't care" 
> condition for
> frwkIpFilterFlowId,  the meaning of a wildcard match for this attribute.
>
>
>>> the draft-ietf-ipv6-flow-label-03.txt draft indicate that there can 
>>> be 3 conditions
>>> for the Flow Label field of the IPv6 header:
>>> 1. It contain the value of zero, meaning it is not used.
>>> 2. It contain some specific value, with no defined syntax and 
>>> semantics.
>>>     Hence each value is unique on its own with no relationship to 
>>> Flow Labels
>>>     of containing another value.
>>> 3. It contain some value other than zero.
>>>
>>> For the first 2 cases indicated above, the filter setup for them is 
>>> trivial, just
>>> set the frwkIpFilterFlowId to zero or the specific value needed.
>>
>>
>> This is clear.
>>
>>> For the 3rd case, the filtering definition should use the 
>>> frwkBaseFilterNegation
>>> set to true and frwkIpFilterFlowId set to zero.  This will indicate 
>>> a filter match
>>> for all Flow Label values other than zero.
>>
>>
>> This is also clear.
>>
>>> Please let me know if this does not resolve the question you have.
>>> Thanks!
>>> -- Kwok --
>>>
>>>
>>> At 09:13 AM 11/8/02 +1100, Brian Williams wrote:
>>>
>>>> Hi Emmanuel.
>>>> Please see comments inline.
>>>> /brian
>>>>
>>>> Emmanuel Dumont wrote:
>>>>
>>>>> Hi Brian,
>>>>>
>>>>> Do you think a wildcard is needed for the FlowId attribute ?
>>>>
>>>> I consider that a wildcard would be needed for FlowId as much as 
>>>> for the other attributes (eg DSCP). I think there would need to be 
>>>> an explanation of why one is not provided.
>>>>
>>>>> Which one could you suggest ?
>>>>
>>>>
>>>> I would think a value of -1 (as used for DSCP) would be appropriate.
>>>>
>>>>> Kwok: is it an omission in the FR-PIB ?
>>>>> Maybe an IPv6 expert can help us to solve that question...
>>>>>
>>>>> Brian : Do you think that others wildcards are missing ?
>>>>
>>>>
>>>> This is the only one that I have identified is missing from the 
>>>> filter. I have not done a careful check on anything else in the 
>>>> document.
>>>>
>>>>> Emmanuel Dumont
>>>>> ----------------------------
>>>>> France Telecom OCISI/DIeP (Guyancourt, France)
>>>>> Mail: [email protected] / [email protected]
>>>>> ----------------------------
>>>>>
>>>>> -----Message d'origine-----
>>>>> De : [email protected] [mailto:[email protected]]De la 
>>>>> part de
>>>>> Brian Williams
>>>>> Envoye : mercredi 6 novembre 2002 00:46
>>>>> A : [email protected]
>>>>> Objet : wildcard flowid in framework PIB?
>>>>>
>>>>> Hi All.
>>>>> I have a question on the framework PIB. When I look at many of the
>>>>> filter attributes, there exist values that can be used as wildcards.
>>>>>
>>>>> The following are a few examples:
>>>>> - for source and destination addresses, a prefix length of 0 
>>>>> indicates a
>>>>> match of any address
>>>>> - for DSCP, a value of -1 will match all DSCP values
>>>>> - for port numbers, you can set the min and max to include all values
>>>>> - for protocol number, a value of 255 means match all
>>>>>
>>>>> However, for the FlowId, the range is specified as 0..1048575 
>>>>> which is
>>>>> the valid range of the 20 bit label. How is a wildcard FlowId 
>>>>> indicated?
>>>>> /brian
>>>>
>>>>
>