02-11-2008 07:57 AM - edited 03-05-2019 09:04 PM
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
02-12-2008 01:20 AM
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
02-12-2008 06:26 AM
02-12-2008 06:46 AM
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
02-12-2008 07:06 AM
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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