From: Scott Morris (swm@emanon.com)
Date: Sat May 28 2005 - 14:08:04 GMT-3
IRDP is done on the FA. The MN will wander around a network, and as it
wanders on someplace that is not its own native network it will need to know
about the gateway to get out. That's the problem that IRDP solves.
The HA simply sits around and waits to hear /32 CoA announcements from the
FA regarding stations that are wandering.
HTH,
Scott
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Stephen Fisher
Sent: Saturday, May 28, 2005 12:44 PM
To: ccie2be
Cc: ccielab@groupstudy.com
Subject: Re: Mobile IP and IRDP
On Fri, May 27, 2005 at 04:40:04PM -0400, ccie2be wrote:
> Now, it makes sense to me that IRDP needs to be configured on the FA
> router. It also seems to me that IRDP should also be configured on the
> HA interfaces where MN exist so that MN's know they are on the Home
> Network.
>
> But, in the examples on the Doc-CD and in the Cisco Press, IRDP isn't
> configured on the HA.
>
> Do you know why that is?
That's a good question.. the way I understand it, the MN knows it is on its
home network when its assigned address (such as through DHCP) matches its
usual IP address. The Cisco Press Mobile IP book also mentions comparing
its usual address to the prefixes received in IRDP announcements so now I'm
not sure either.
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