Nov 6 13:46:26.742: DHCPD: Sending notification of DISCOVER: The debug ip dhcp events & debug ip dhcp server packets are useful debugging commands that will help us identify what is happening: The first symptoms of DHCP server issues are users nagging that they cannot connect to the network because they haven’t got an IP address, and that’s where the fun begins.Īssuming no configuration changes have been made to the Cisco DHCP server, the best way to troubleshoot the problem is to enable debugging on the dhcp server.

The good news is that configuration and debugging commands are identical for both Cisco Catalyst switches and Cisco routers.ĭebugging DHCP Server On Cisco Catalyst Switch & Cisco Router

Small-sized networks usually have DHCP services configured on their Cisco router, while large-sized networks (with multiple VLANs) assign DHCP services to their backbone layer-3 switch (Catalyst 6500, 4500, 3750 etc). System messages such as ‘ POOL EXHAUSTED’, ‘ ASSIGNMENT FAILURE’ & ‘ address pool Guest-VLAN is empty’ provide some basic information, however further investigation is required to identify the real cause. Everything usually works without a problem, however there are times when the Cisco DHCP server stops assigning IP addresses and we need to look into the issue and resolve it as quickly as possible.

In previous articles, we showed how it is possible to configure a Cisco router or Catalyst switch to provide DHCP server services to network clients.

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