>>>>> "Pascal" == Pascal Thubert <(pthubert)" <pthub...@cisco.com>> writes:
>> On 2010-08-09 22:17, Pascal Thubert (pthubert) wrote: > Hi
>> Michael:
>> >
>> > With
>> http://tools.ietf.org/html/draft-ietf-roll-rpl-07#section-7.2 I >
>> tried to stay within the lines of RFC 3697 as you also defend in
>> your > mail.
>> >
>> > I think the question we have now is not whether that proposal
>> is > lawful but whether the new law being defined at 6MAN would
>> prevent it > in the future. > If the updated rules allow, then
>> I'll be glad to work on an FL-based > alternate to the
>> IPinIP/HbH.
>>
>> So I understand that ROLL would definitely need the ability to
>> define explicit semantics on the label. Would it also need the
>> label to be mutable?
>>
Pascal> [Pascal] The FL based proposal for RPL uses 12 mutable bits.
Pascal> They are used as an in-band control plane that checks the
Pascal> consistency of routing states along a path. Those states can
Pascal> easily get out of sync due to the nature of the links, but
Pascal> the maintenance can be costly. We want to accelerate the
Pascal> repairs on those links that are actually used when an
Pascal> inconsistency is detected that will impact the delivery.
I don't understand how the FL helps us on this! Probably I missed
something important. What you write below was my entire understanding
of our need for an in-band tag.
Pascal> RPL also builds multiple topologies (virtual networks
Pascal> identified by an instanceID) to address various constraints,
Pascal> in terms that can be such as metrics but also
Pascal> administrative. E.g. a power utility Command & Control
Pascal> network at home will have a specific ID that's different
Pascal> from the default general purpose one, so the power related
Pascal> traffic ends up at the power utility GW along a specific
Pascal> graph.
Pascal> An opaque instanceID for the topology can be known by the
Pascal> end points. The instanceID is not necessarily related to QoS
Pascal> and does not map to a per hop behavior, but in our case, to
Pascal> acts more like L3 .1Q tag. The Flow Label is the only field
Pascal> available for an application to pass such information to the
Pascal> network. Thus the non-mutable 8 bits in the proposal.
+1
--
] He who is tired of Weird Al is tired of life! | firewalls [
] Michael Richardson, Sandelman Software Works, Ottawa, ON |net architect[
] m...@sandelman.ottawa.on.ca http://www.sandelman.ottawa.on.ca/ |device driver[
Kyoto Plus: watch the video <http://www.youtube.com/watch?v=kzx1ycLXQSE>
then sign the petition.
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