How to configure load balancing between multiple DHCP servers connected in a switched network

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Jul 22, 2009 7:54 PM
Jun 22nd, 2009

Core issue

This configuration is desired when there are two DHCP servers on the network, and IP helper addresses are configured for each server. However, only one server receives most of the DHCP address requests.

In order to verify that only one server receives most of the requests, it is necessary to perform a sniffer trace on the ports connected to DHCP servers.

Resolution

If there are multiple DHCP servers, load balancing is not possible because the DHCP client PC-broadcasts a DHCP discover packet sourced from 0.0.0.0 and destined for 255.255.255.255. By default, the router blocks all of the broadcasts packets.

Refer to Understanding and Troubleshooting DHCP in Catalyst Switch or Enterprise Networks and Configuring the Catalyst Switched Port Analyzer (SPAN) Feature for additional information.

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Posted June 22, 2009 at 6:10 PM
Updated July 22, 2009 at 7:54 PM
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