From: Scott Morris (swm@emanon.com)
Date: Wed May 18 2005 - 15:19:27 GMT-3
That's a good idea too, but don't we see that in IPv4 with the 224.0.0.x
multicast addresses use (local link multicast)?
May be a new version of it!
Where's Howard to help us with the RFC/draft/evil-thinking stuff? (grin)
Scott
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
ccie2be
Sent: Wednesday, May 18, 2005 12:23 PM
To: 'Lee Donald'; ccielab@groupstudy.com
Subject: RE: IPV6 Link Local FE80
Well, in that case, how about this for an explanation?
By using the link-local address, there's no need for a TTL since IGP's
packets should not be forwarded off the local link.
I don't really know if that's true but how does that sound to you.
Tim
-----Original Message-----
From: Lee Donald [mailto:Lee.Donald@t-systems.co.uk]
Sent: Wednesday, May 18, 2005 11:59 AM
To: ccie2be; Lee Donald; ccielab@groupstudy.com
Subject: RE: IPV6 Link Local FE80
Thanks Tim, but that's the bit I already know.
I want to know why it chooses the link local address as oppose to the
outside global address.
Regards
Lee.
-----Original Message-----
From: ccie2be [mailto:ccie2be@nyc.rr.com]
Sent: 18 May 2005 16:48
To: 'Lee Donald'; ccielab@groupstudy.com
Subject: RE: IPV6 Link Local FE80
Hey Lee,
I'll take a shot at this.
First, this requirement isn't specific to rip, I believe it applies to all
ipv6 routing protocols except BGP. Also, I think this applies to all nbma
media except isdn.
Here's how I understand it.
Assume r1 and r2 are connected via f/r and are running an ipv6 based routing
protocol, take your pick.
When an ipv6 IGP sends out updates or LSA's or Hello's, by default, the
source ipv6 of the update is the link-local address. Therefore, for the
receiving rtr to be able to respond, it uses the link-local address. If you
don't have a static mapping you'll get an encap failed message.
HTH, Tim
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Lee
Donald
Sent: Wednesday, May 18, 2005 11:26 AM
To: ccielab@groupstudy.com
Subject: IPV6 Link Local FE80
Can anybody tell me why on frame-relay, using RIPng for instance does the
rip route in the table point towards the link local of the originating
router? Shouldn't this route come from the global address of the originating
router?
I know how to get it working over frame, by having a frame-map to the global
and then a frame map to the link local of the remote but I would like to
know why?
Any takers?
Thanks in advance.
Lee.
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