From: Kian Wah Lai (kian_wah@qala.com.sg)
Date: Fri Dec 03 2004 - 11:45:13 GMT-3
From my friend in Cisco IPv6 testing team:
a node in local link always use link-local of its default ipv6 router
instead of ruter's agg... global unicast address.
Also, if networking renumbering must occur, meaning that the unicast
aggregatable global prefix is changed to a new one, the default router can
always be reached using the link-local adress.
link local address of nodes and routers do not change during networking
renumbering
More info:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios123/123cgcr/ipv6
_c/sa_bconn.htm#wp1068829
Another thing is, I remembed somewhere that link local address is a must for
IPv6.
Regards,
Kian Wah
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
ccie2be
Sent: Friday, December 03, 2004 10:27 PM
To: Kian Wah Lai; 'Group Study'
Subject: Re: ipv6 enable
Thanks Kian.
Actually, I knew that part of it.
What I can't figure out is why or how that would be useful.
If packets can't leave the local link, why have a router on the local link
with the link-local address enabled? What useful thing is being
accomplished?
Thanks, Tim
----- Original Message -----
From: "Kian Wah Lai" <kian_wah@qala.com.sg>
To: "'ccie2be'" <ccie2be@nyc.rr.com>; "'Group Study'"
<ccielab@groupstudy.com>
Sent: Friday, December 03, 2004 9:21 AM
Subject: RE: ipv6 enable
> Once you do 'ipv6 enable', the router will automatically configure a link
> local address on your interface. Because the address is link local, I
don't
> think you can leave the local link.
>
> Regards,
> Kian Wah
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> ccie2be
> Sent: Friday, December 03, 2004 9:11 PM
> To: Group Study
> Subject: ipv6 enable
>
> Hi guys,
>
> What's the point of enabling ipv6 on a router interface with the above
> command?
>
> If you have this config:
>
> int e0
> ipv6 enable
>
>
> There's no site-local or aggregatable global unicast so how will neighbor
> discovery work and even if neighbor discovery does work, how would traffic
> be able to leave the local link without a prefix?
>
> Thanks, Tim
>
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