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Community Member

DHCP SERVER Problem

I have configured DHCP server on cisco catalyst 3750. But now I am having problem with the IP address assignment.

I have exclude the first 70 IP addresses

and Last 5 addresses.

But now when clients wants to get the IP i got the error that

CO-DATA_POOL is empty.

Though i have 175 Ip address in POOL. Hardly 80 clients are connected, but still i m having problem. Few times I am getting gratuitous ARP and Ip address conflit.

sometimes new machines are fail to get IP address, i have to assign them manual IP address then it starts working.

ip dhcp excluded-address 172.28.92.251 172.28.92.255

ip dhcp excluded-address 172.28.93.251 172.28.93.255

ip dhcp excluded-address 172.28.86.251 172.28.86.255

ip dhcp excluded-address 172.28.87.251 172.28.87.255

ip dhcp excluded-address 172.28.79.251 172.28.79.255

ip dhcp excluded-address 172.28.78.251 172.28.78.255

ip dhcp excluded-address 172.28.93.1 172.28.93.70

ip dhcp excluded-address 172.28.92.1 172.28.92.70

ip dhcp excluded-address 172.28.86.1 172.28.86.70

ip dhcp excluded-address 172.28.87.1 172.28.87.70

ip dhcp excluded-address 172.28.79.1 172.28.79.70

ip dhcp excluded-address 172.28.78.1 172.28.78.70

!

ip dhcp pool CO_DATA

network 172.28.92.0 255.255.255.0

default-router 172.28.92.254

dns-server 172.28.32.11

domain-name waridtel.cg

lease 8 23 59

!

ip dhcp pool CO_VOICE

network 172.28.93.0 255.255.255.0

default-router 172.28.93.254

option 150 ip 172.28.80.10

dns-server 172.28.32.11

4 REPLIES
Community Member

Re: DHCP SERVER Problem

Kindly make sure, you have configured your trunks perfectly. Moreover, is 'ip routing' enabled on your 3750 switch or on the switch which is actually doing inter-vlan routing if you have different data/voice-vlans.

Kindly post 'show run' output of the 3750 switch.

--gaurav

Community Member

Re: DHCP SERVER Problem

Thanks for the reply, IP routing is already enable and trunk configuration is also fine. Anyway i am sending you my switch confgiration please see and tell me why this is happening.

Re: DHCP SERVER Problem

Try configuring portfast on the ports connecting to desktops

Also are you sure you are not running into problem due to DHCP lease time?

Narayan

Community Member

Re: DHCP SERVER Problem

All the ports already in portfast. I not getting any lease message. problem only arise when new clients add in my network and clients with static IP shift to dynmaic IP. But when I assign new clients static Ip they works fine. At that time i got error of DHCP POOL has no IP address and stuff like that.

BZV-TD-EDN3750-01#sh ip dhcp conflict

IP address Detection method Detection time

172.28.92.102 Ping Feb 11 2008 05:11 PM

172.28.92.148 Ping Feb 11 2008 05:47 PM

172.28.92.180 Ping Feb 11 2008 10:13 PM

172.28.92.241 Ping Feb 11 2008 10:18 PM

172.28.92.175 Gratuitous ARP Feb 12 2008 11:28 AM

1w0d: DHCPD: DHCPDISCOVER received from client 0100.166f.6a18.55 on interface Vlan100.

1w0d: DHCPD: address pool CO_DATA is empty.

1w0d: DHCPD: DHCPDISCOVER received from client 0100.166f.6a18.55 on interface Vlan100.

1w0d: DHCPD: address pool CO_DATA is empty.q

I have attached the configuration please review it.

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