Subject: RE: comment to draft-draves-ipngwg-router-selection-00.txt

From: "Richard Draves" <[email-masked]>
Date: Thu, 26 Apr 2001 21:21:00 -0700

> 	RA preference is very useful in the following very 
> simple situations.
> 	your slide did not cover this, i believe this scenario 
> is the most
> 	popular case.

itojun, yes the router selection mechanisms will definitely help your
scenario. I didn't focus on this scenario in my discussion because I
feel the most challenging scenarios have different administrators for
the routers, and your scenario most likely involves a single
administrator who can coordinate the configuration.

Thanks,
Rich

> a host is on a non-leaf network.
> - if we throw RA from router A only, we will lose 
> connectivity to "leaf"
>   if router A goes down.
> - if we throw RA from both router A and B, we have lots of 
> icmp6 redirect
>   if router B is picked as the default outgoing router for host C.
> 
> so what you will want to do is:
> - set RA preference as router A > router B, advert from both.
> 
> upstream
>   |
> router A
>   |
> ==+===============+==
>   |		  |
> router B	host C
>   |
> leaf
> 
> 
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