[52613] in North American Network Operators' Group
Re: iBGP next hop and multi-access media
daemon@ATHENA.MIT.EDU (Pete Templin)
Mon Oct 7 08:38:53 2002
Date: Mon, 7 Oct 2002 07:38:18 -0500 (CDT)
From: Pete Templin <templin@urdirect.net>
To: Ralph Doncaster <ralph@istop.com>
Cc: "nanog@merit.edu" <nanog@merit.edu>
In-Reply-To: <Pine.LNX.4.21.0210070026070.3597-100000@ns.istop.com>
Errors-To: owner-nanog-outgoing@merit.edu
On Mon, 7 Oct 2002, Ralph Doncaster wrote:
> When you setup a secondary ip on an interface
> int fa0/0
> ip address a.b.c.d e.f.g.h secondary
>
> How does it determine where to send the packets? ARP.
> Which is the same as adding the route described above.
From what I've read so far, it looks like you're asking for is more like
automatic discovery of new subnets local to a given segment, followed by
preferential route selection similar to HSRP.
Except above, you're claiming that adding a secondary interface is the
same as adding a route. It's not, as adding the secondary interface
provides a logical link between a layer 3 address and a layer 2 address,
so that ARP is not needed to find the next-(layer 3)-hop, only to find the
next layer 2 hop.
Again, let's move routing 101 to different venue.
Pete
--
Peter J. Templin, Jr., CCNP, CCDP
Networking Consultant
On-Line Internet Services - URDirect.net
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