From: Mark Lasarko (mlasarko@co.ba.md.us)
Date: Fri May 20 2005 - 20:12:06 GMT-3
Thanx Tim,
Yes, I am certain you are correct about the multi-topology requirement.
And, since multi-topology requires wide (or transition) metrics
And, since I have seen various examples with little consistency
(it appears each vendor has a preference - some wide, some transition)
That's what prompted me to post the question in the first place.
But now that you have mentioned multi-topology <grin>
What do you think about this?
Rack1R1(config)#router isis
Rack1R1(config-router)#address-family ipv6
Rack1R1(config-router-af)#multi-topology ?
transition Accept and generate both IS-IS IPv6 and Multi-topology IPv6
TLVs
*In the above, I gather that if we do not add the transition keyword
our multi-topology ISIS cannot communicate with single-topology ISIS routers
but does that infer another router running only IPv6???
If so that would be an interesting twist IMHO.
And keeping in mind that one of these things (above) is not like the other
(below)
Rack1R1(config)#router isis
Rack1R1(config-router)#metric-style ?
narrow Use old style of TLVs with narrow metric
transition Send and accept both styles of TLVs during transition
wide Use new style of TLVs to carry wider metric
*Interpreting this as being required for base ISIS functionality with IPv6
~M
>>> "ccie2be" <ccie2be@nyc.rr.com> 05/20/05 6:32 PM >>>
Hey Mark,
That's a different question altogether.
Off-hand, I donno for sure if ipv6 requires metric wide. But, I'm pretty
sure isis requires multitopology for ipv6.
Maybe in your NMC labs, you can find some ipv6 and isis examples. I've
heard some good things about the NMC labs when it comes to ipv6.
Sorry, I couldn't be more helpful.
Tim
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Mark
Lasarko
Sent: Friday, May 20, 2005 5:49 PM
To: ccielab@groupstudy.com; ccie2be@nyc.rr.com
Subject: RE: isis metric-style transition
Greetings Tim,
Really?
I thought for sure IPv6 required this??
Something about the TLV's which advertise IPv6 info only being able to use
wide metrics...
I had not intended the question to be interpreted in the context of use for
IPv4 metrics > 63
Sorry if the question was not clear the way it was worded.
~M
>>> "ccie2be" <ccie2be@nyc.rr.com> 05/20/05 5:06 PM >>>
mark,
Unless you're told to use wide metrics either explicitly (unlikely) or
implicitly ( count the ways this could be done), I wouldn't start adding
misc commands to your config except for alias' or other "shopkeeping"
functions.
Unless you need to have isis metrics that go higher than 63, I think, don't
bother.
But, to each their own.
Tim
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Mark
Lasarko
Sent: Friday, May 20, 2005 2:30 PM
To: ccielab@groupstudy.com
Subject: isis metric-style transition
Greetings GS,
Aside from the extra TLV's generated...
Is it a good idea to use this option in the lab?
Are there other reasons we should stick to "wide"?
TIA,
~M
BTW - I also noticed this recent memo relating to the subject:
M-ISIS: Multi Topology (MT) Routing in IS-IS
http://bgp.potaroo.net/ietf/ids/draft-ietf-isis-wg-multi-topology-10.txt
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