asd-dave
asked on
DHCP on a Cisco Catalyst 3750
I'm trying to get the DHCP server to work on Cisco IOS. The IOS is 12.2(25)SEE2) running on a Catalyst 3750 switch. (We usually us Microsoft DHCP.)
I have a test Vlan (VLAN99) defined. When I assign a static address (10.67.99.1) to my workstation, I'm able to get everywhere I need to, so the VLAN seems to be set up correctly. But when I set my nic to use DHCP, I get the default 169.x.x.x address. It's behaving like the port is on the wrong vlan, but it's the same port that works fine with a static address.
Here's how I have DHCP configured on the Cisco IOS.
ip dhcp pool RESTRICT
network 10.67.99.0 255.255.255.0
domain-name restrict.com
dns-server 10.67.0.7
default-router 10.67.99.247
lease 7
The client is Windows XP SP3.
I'm beginning to wonder if there's something in our Active Directory GPO that only allows us to accept IP addresses from DHCP servers already registered in AD??
I have a test Vlan (VLAN99) defined. When I assign a static address (10.67.99.1) to my workstation, I'm able to get everywhere I need to, so the VLAN seems to be set up correctly. But when I set my nic to use DHCP, I get the default 169.x.x.x address. It's behaving like the port is on the wrong vlan, but it's the same port that works fine with a static address.
Here's how I have DHCP configured on the Cisco IOS.
ip dhcp pool RESTRICT
network 10.67.99.0 255.255.255.0
domain-name restrict.com
dns-server 10.67.0.7
default-router 10.67.99.247
lease 7
The client is Windows XP SP3.
I'm beginning to wonder if there's something in our Active Directory GPO that only allows us to accept IP addresses from DHCP servers already registered in AD??
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ASKER
It seems like the VLAN 99 is not created.
Enter in config mode:
Rounter(config)# Vlan 99
#exit
It wouldn't let me because this switch is in vtp client-mode. I went ahead and issued the command on the switch that's in server-mode. No difference.
[no] debug platform ip dhcp all|error|event|packet|rpc
I issued the command with "all" to get all information. Next I put the selected port in vlan 99 and tried to get an IP address. Ddin't get an IP address, and got no messages from the console.
As an aside, I checked the native vlan. (Shouldn't matter in this case, but thought I'd check.) While I know it's not a good practice, the native vlan is 1 on all switches.
Guess I'm not missing something obvious??
Enter in config mode:
Rounter(config)# Vlan 99
#exit
It wouldn't let me because this switch is in vtp client-mode. I went ahead and issued the command on the switch that's in server-mode. No difference.
[no] debug platform ip dhcp all|error|event|packet|rpc
I issued the command with "all" to get all information. Next I put the selected port in vlan 99 and tried to get an IP address. Ddin't get an IP address, and got no messages from the console.
As an aside, I checked the native vlan. (Shouldn't matter in this case, but thought I'd check.) While I know it's not a good practice, the native vlan is 1 on all switches.
Guess I'm not missing something obvious??
ASKER
Thanks everyone for your help. I knew it had to be something simple. I logged a case with Cisco, and the tech saw that I didn't have the DHCP service turned on. (If I didn't see a line in the config that said "no service dhcp", I didn't know to turn it on.) In global config mode, I entered "service dhcp" and everything magically worked!
ASKER
Cisco TAC solved question. But thanks everyone for your help.
ASKER
1. Removing workstation from the domain had no effect.
2. I entered the debug statement, tried getting an IP address, and got no output.
3. 10.67.99.247 is an IP address of a virtual interface on our core switch. If I give the workstation a static ip address (say... 10.67.99.5), everything routes as expected. But just to rule it out, I created another virtual address on the "local" 3750 of 10.67.99.246, and changed the default-router parameter to that address. (The local 3750 is where dhcp is configured). This also resulted in no change, and there was no output on the debug screen.
4. I don't believe we need a helper address because we're dealing with a layer 3 switch, routing is enabled, and the DHCP scope is defined on that same switch. (So VLAN99 exists on the switch, the scope 10.67.99.0/24 is defined on the same switch, and the port the workstation is plugged into is on VLAN99. (switchport access vlan 99)
5. Just to rule out any strange quirks on my workstation, I am now trying it on a different workstation, and getting the same results.