From: dampened (cheechew@hotmail.com)
Date: Wed Dec 20 2006 - 23:14:24 ART
I am not using dhcp option82. Just simple dhcp snooping. I cannot access the
equipments right now.
----- Original Message -----
From: Jian Gu
To: dampened
Cc: Cisco certification
Sent: Thursday, December 21, 2006 4:45 AM
Subject: Re: dhcp snoop
Do you have ip dhcp snooping option turned-on on switch2? by defaut switch1
will drop all DHCP packets with option82 inserted, use the following command
to allow DHCP packets to go through.
"ip dhcp snooping information option allow-untrusted" Anyway, it is just my
guess, "debuging ip dhcp snooping" on both switch1 and switch2 should tell you
where theproblem is, it is a simple feature.
On 12/20/06, dampened <cheechew@hotmail.com> wrote:
I have topology where there are 2 switches, upstream and downstream. The
DHCP server is on vlan 2 and client on vlan 3. Both switch are connected
by
trunk.
Here is the skeleton of the config.
When ip put "ip dhcp snooping vlan 3" on switch 2, the client could not
get
IP from DHCP. When I removed it, everything is fine, the binding is
properly
built on switch 1. But without the snooping on switch 2, the feature
actually is not yet configured. Whats wrong with my config?
switch-1:
ip dhcp snooping
ip dhcp snooping vlan 3
interface f0/1
description connect to DHCP server
switchport access vlan 2
switchport mode access
ip dhcp snooping trust
interface f0/24
description trunk to switch 2
interface vlan 2
ip address ...
interface vlan 3
ip address ...
ip helper-address dhcp_server
switch-2:
ip dhcp snooping
ip dhcp snooping vlan 3 <-----------------------------
interface f0/1
description connect to DHCP client
switchport access vlan 3
switchport mode access
interface f0/24
description trunk to switch 1
ip dhcp snooping trust
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