From: Jian Gu (guxiaojian@gmail.com)
Date: Thu May 31 2007 - 22:08:02 ART
I think DHCP snooping process checks MAC table's dynamic entry of that VLAN,
obviosuly the MAC address of vlan 10 on SW2 is using router's MAC and it is
a static MAC.
What is your purpose of this configuration?
On 5/31/07, sebastan bach <sebastan.bach@gmail.com> wrote:
>
> has anyone faced this problem with dhcp snooping .
>
> here;s my scenario
>
> sw1 has a host on vlan 10 and there;s a SVI for vlan 1o with ip add
> 10.1.1.1/24.
>
> dhcp server is configured on the switch
>
> ip dhcp excluded-address 10.1.1.1
>
> ip dhcp pool mypool
> network 10.1.1.0 /24
> default-router 10.1.1.1
>
> the host on SW1 gets the ip address from dhcp server.
>
> i have also enabled dhcp snooping for vlan 10.
>
> i have a SW2 with a SVI for vlan 10.whose ip address is set to get from
> dhcp
>
> int vlan 10
> ip address dhcp.
>
> trunk has been configured between SW1 and SW2.
>
> i have also enabled dhcp snooping for vlan 10 on SW2.
>
> and i have configured the trunk ports on both the switches as trusted
> ports
> for dhcp snooping.
>
> on SW1 i can see the dhcp server has assigned a ip address to the SVI on
> SW2
> but on SW2 the ip address is not assigned to int vlan 10.
>
> with the debug i see that when the dhcp reply reaches the trunk port of
> SW2
> it says it cannot find the mac-address and drops the packet.
>
> in the mac-address able also i cannot the mac-address of the SVI vlan 10.
>
> when i disable dhcp snooping everything works fine, the SVI on SW2 gets
> the
> ip address from the dhcp server.,
>
> can u help me with getting this working with dhcp snooping or tell me why
> this is not working .
>
> any help will be greatly appreciated.
>
> regards
>
> sebastan
>
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