Re: DHCP server problem

Bryan,

either
make the fa0/21 on SW3 a routed port (no sw) with ip add dhcp configured
or
slap an SVI with vlan 90 on SW3 with ip add dhcp configured

Tharak Abraham Luke

On Sun, Apr 24, 2011 at 1:42 AM, Bryan Stair <uptown.ccie_at_gmail.com> wrote:

> Hey,
>
> Working on a lab and came across problem with dhcp and I am not sure why
> it's not working. Scenario asks to config R3 as DHCP server, the dhcp
> client
> is a switchport one hop away. I was able to setup the pool and the links
> correctly, but the switchport never get the address. Debugging did not
> provide any glaring answers. Can someone shed light on this.
>
>
> R3 fa0/0 ======FA0/1-SW2-FA0/21=======FA0/21-SW3
>
> R3
> DHCP server R3
> Pool 172.16.90.0/24
>
> SW2
> L3 link between R3 fa0/0 and SW2 fa0/1
> SVI VLAN 90 on SW2
> ip helper on SVI 90 pointing toward R3 fa0/0
>
> VLAN 90 between SW2 fa0/21 and SW3 fa0/21
>
> SW3
> SW3 fa0/21 ip address dhcp
>
> R3
> !
> ip dhcp pool VLAN90
> default-router 172.16.90.1
> network 172.16.90.0/24
> lease infinite
>
>
> interface fa0/0
> ip address 172.16.31.3/24
>
>
> SW2
>
> ip dhcp snooping
> ip dhcp snooping vlan90
>
>
> int fa0/1
> ip address 172.16.31.20/24
>
> int fa0/21
> switchport mode access
> switchport access vlan 90
>
>
> interface vlan 90
> ip address 172.16.90.21/24
> ip helper-address 172.16.31.3
>
>
> SW3
> interface fa0/21
> switchport mode access
> switchport access vlan 90
>
>
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Received on Sun Apr 24 2011 - 10:01:30 ART