DHCP Message Debug

[JRGC]

Dear,

I found a few message debug DHCP, the vlan10 interface has configured the  ¨ip helper-address ¨ command to address 172.26.3.100 which reach through vlan 12 to site B .

Taking into account that the DHCP server is on the Catalyst 4500, This command was configured as backup.

Catalyst 4507

ip dhcp pool SSID_Guests

network 172.16.1.0 255.255.254.0

default-router 172.16.1.1

dns-server 8.8.8.8 192.168.151.2

!

interface Vlan12

description Transport to siteB – Catalyst6800

ip address 172.32.2.66 255.255.0.0

no ip redirects

!

interface Vlan10

ip address 172.16.1.1 255.255.254.0

ip helper-address 172.26.3.100

no ip redirects

Debug dhcp

DHCPD: Sending notification of DISCOVER:
DHCPD: htype 1 chaddr a41f.7235.8749
DHCPD: interface = Vlan12
DHCPD: class id 4d53465420352e30
DHCPD: out_vlan_id 0
DHCPD: there is no address pool for 172.32.2.66.
DHCPD: Sending notification of DISCOVER:
DHCPD: htype 1 chaddr 8485.0623.503b
DHCPD: giaddr = 172.26.176.10
DHCPD: interface = Vlan10
DHCPD: out_vlan_id 0
DHCPD: Sending notification of DISCOVER:
DHCPD: htype 1 chaddr 8485.0623.503b
DHCPD: giaddr = 172.26.176.10
DHCPD: interface = Vlan10
DHCPD: out_vlan_id 0
DHCPD: Adding binding to radix tree (172.16.1.163)
DHCPD: Adding binding to hash tree
DHCPD: assigned IP address 172.16.1.163 to client 0184.8506.2350.3b. (168 0)


 

[Rejohn Cuares]

Could you please specify what issue you are facing with so we could assist.

[JRGC]

Thank Rejohn,

The query is, if messages Logs are due to the configuration of the ip helper-address command in VLAN interface.

DHCPD: Sending notification of DISCOVER:
DHCPD: htype 1 chaddr a41f.7235.8749
DHCPD: interface = Vlan12
DHCPD: class id 4d53465420352e30
DHCPD: out_vlan_id 0
DHCPD: there is no address pool for 172.32.2.66.

[Rejohn Cuares]

My understanding to your problem is the computers in VLAN 12 (172.32.2.0/24) are not getting IP addresses because the switch doesn't have a scope for 172.32.2.0/24 and can't allocate IP address (error: DHCPD: there is no address pool for 172.32.2.66). Furthermore, you mentioned you have a centralised DHCP server, then you should add "ip helper" under VLAN 12 and make sure the DHCP server has a scope for 172.32.2.0/24 network.