- still unclear to me whether isis pce disc. will or not use a
separate inst. (cf. gen-app discussion at isis working group)
ISIS pce disc relies on procedures defined in 4971.
This is a deployment issue to use same or separate instances.
do you assume that you would leave such choice possible ? i
was left with the impression after last isis mtg discussion
that there is a real incentive for making this a recommended
behavior
Just to avoid confusion: the PCED is being carried within the ISIS
Router Capability TLV, the processing of which is defined in RFC4971.
indeed, i am not referring to 4971 at such, i am referring to the
fact that if exchanging non-routing info w/ is-is result in recommending
separated instance then the ISIS PCE disc. w-g doc becomes a prime
candidate for such recommendation. just a matter of consistency.
My understanding of the discussion in the ISIS working group is that:
- They are tending towards believing that there should be a separation
between
flooding of IP link-state information and *all* other information
- They think that such a separation might reasonably be handled by using
multiple (greater than one) instances of ISIS
- They have not yet reached a conclusion as to whether existing extensions
fall into this category, but there was building opinion that TE
advertisements
might be strong candidates for off-loading to a second instance
- The Router Capability TLV would also be up for consideration
No slides for this topic from the ISIS working group in Chicago seem to have
been posted yet.
The most recent version of the relevant I-D appears to be
http://www.ietf.org/internet-drafts/draft-ginsberg-isis-genapp-01.txt
although I know Les was planning some updates as a result of the Chicago
meeting.
It seems to me that:
1. The ISIS working group is not going to reach a conclusion on this
in a hurry.
2. When they do reach a conclusion we MUST fall in with it.
3. In the mean time, just as TE and Router Caps are currently
carried in a single instance, the PCE discovery will be so
carried.
4. You should all contribute to this discussion on the ISIS mailing list.
Cheers,
Adrian
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