From: Narbik Kocharians (narbikk@gmail.com)
Date: Fri Feb 16 2007 - 20:28:07 ART
The trust command
On 2/16/07, Jian Gu <guxiaojian@gmail.com> wrote:
>
> This was asked before, there is a interface command which will allow DHCP
> packets with option 82 to go through in stead of drop them.
>
> On 2/16/07, Filyurin, Yan <yan.filyurin@eds.com> wrote:
> >
> > Hello list. I was recently playing around with DHCP snooping
> > configuration
> > and they way I had it set up was that I had router A and B connected to
> a
> > switch being on the same vlan where A was getting its IP address from B
> > through DHCP. So I decided to play with DHCP snooping and enabled it
> for
> > that
> > particular vlan. Suddenly DHCP stopped working. After doing a couple
> of
> > debugs, I could see that A was originating the request and B was seeing
> it
> > and
> > giving an error, and the only way I could resolve it is by doing:
> >
> > no ip dhcp snooping information option
> > And ip dhcp snooping trust
> > After reading RFC that kind of makes sense and of course the second
> makes
> > sense on the router port. The question is. If I had router C
> (somewhere
> > behind router B) set up as a DHCP server and router B would just be a
> > relay
> > with the helper-address command, would I still need to do this tweak
> > because
> > it appeared that router B was getting confused by the switch setting
> > option
> > 82.
> >
> > Thank you
> >
> >
> >
> >
> > Yan Filyurin
> > EDS - Bank of America, Network Design
> > MS: MA6-536-0501
> > 1025 Main Street
> > Waltham, MA 02451
> > Office: +1-781-788-2207
> > Cell: +1-617-875-4862
> > yan.filyurin@eds.com
> >
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-- Narbik Kocharians CCIE# 12410 (R&S, SP, Security) CCSI# 30832 Network Learning, Inc. (CCIE class Instructor) www.ccbootcamp.com (CCIE Training)
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