From: Edwards, Andrew M (andrew.m.edwards@boeing.com)
Date: Thu Feb 10 2005 - 16:22:15 GMT-3
Hey Tim... I didn't want you to think I forgot about you... I got busy
and wanted to return the info on the link-local question.
It is my understanding that link-local addresses come from pool on the
router and that there is a duplicate ipv6 address mitigation technique
that occurs on the link-local segment. The router will take an eiu-64
address from the pool for the link-local address unless you define one.
Weather the pool is the same or not on all routers is really irrelevant.
It's the dynamic pool allocation of a link-local address that creates
the issue.
If you don't define a link-local statically on one node, and an adjacent
node has a static mapping to the remote link-local dynamic address; if
the remote router reboots, then the static mapping is no longer valid.
This could happen during OSPFv6 over frame-relay and unless you
statically set the link-local address to coincide with the static
mapping, when the remote router reboots, there is a possibility it will
pick a different address from the pool to generate the eiu-64 ipv6
address. And so your IGP will fail upon reboot. A potentically classic
CCIE lab scenario!
HTH,
Andy
-----Original Message-----
From: ccie2be [mailto:ccie2be@nyc.rr.com]
Sent: Thursday, February 10, 2005 7:24 AM
To: Group Study
Subject: ipv6 ISIS
Hi guys,
http://www.cisco.com/univercd/cc/td/doc/product/software/ios123/123cgcr/
ipv6_
c/sa_isis6.htm#wp1036755
I'm confused with the usage of the area-name parameter in the example
from the above link.
This example shows the area-name parameter in the summary steps used
with the router isis command, but in the detailed it doesn't use this
parameter.
However, in interface mode, it shows the area-name used with the ipv6
router isis command.
The command reference doesn't offer much help either.
1) When do I need to use the area-name parameter with the router isis
command?
2) Assuming this parameter is used with the interface command, ipv6
router isis, and has a value of AREA-1, where else in the config will
this parameter also need to be used? For example, will it have to be
used on all other router interfaces connecting to this same link?
TIA, Tim
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