Re: [nsp] Multi-Homing without BGP

From: Jared Mauch (jared@puck.nether.net)
Date: Fri Oct 13 2000 - 15:05:14 EDT


On Fri, Oct 13, 2000 at 11:55:13AM -0700, Scott Whyte wrote:
> There *is* a major difference if the interface you are pointing at is a
> broadcast media, e.g. Ethernet. If you use the second form, you will end
> up trying to arp for every destination you want, since the router will not
> know what the next hop is. This can lead to serious problems.

        Very correct, you can end up doing proxy-arp for each destination.

        This can cause severe performance problems on routers
as they spend all their time doing proxy-arp or arp instead
of forwarding packets.

        It would be nice if cisco made it impossible to point static
routes out multidestination interfaces. It should be very easy
based upon cef adjencies, as that knows what is a point to point
interface versus multipoint, etc..

        - jared

-- 
Jared Mauch  | pgp key available via finger from jared@puck.nether.net
clue++;      | http://puck.nether.net/~jared/  My statements are only mine.
END OF LINE  | Manager of IP networks built within my own home



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