Subject: [nemo] Issue 10

From: Vijay Devarapalli <[email-masked]>
Date: Thu, 31 Jul 2003 11:50:18 -0700

hi Pascal and all,

I want to see if we can close issue 10. 

Binding Ack status 143 is supposed to be used when the 
HA cant figure out which MNP belongs to the MR in the 
implicit mode. it is every essential to have this error 
status because we dont want the MR assuming that the HA 
has set up forwarding for the MNP when it actually didnt.
it doesnt matter which mechanism (Prefix Table being one)
is used by the HA in the implicit mode.

status code 143 is not supposed to be used when an IGP
is being run over the MR-HA tunnel. when an IGP is being
used, the HA just waits for the routing protocol updates
from the MR and does not attempt to create any routes if
the BU did not contain any prefix information.

there are basically three different mechanisms by which 
the MR propagates routes to the HA.

1. explicit mode. the Binding Update contains the prefix 
   information in the mobility options (Mobile Network
   Prefix option or Mobile Network Prefix Length option)

2. implicit mode. the HA figures out the MNP through 
   mechanisms not defined in the draft. a pre-configured
   Prefix Table is one such mechanism that you can use.
   a static route configuration (manually added) is 
   another one.

3. IGP over the MR-HA tunnel.

I dont want to mix up (3) with (2). I would like to keep
the IGP part separate from the rest of the specification.
I am not too sure we have taken care of all the issues
related to running an IGP over the tunnel.

does this make sense?

Vijay