Relay agents are used to forward requests and replies between clients and servers when they are not on the same physical subnet. This command enables the DHCP broadcast to be forwarded to the configured DHCP server.Ī DHCP relay agent is any host that forwards DHCP packets between clients and servers. The Cisco IOS DHCP relay agent will be enabled on an interface only when the ip helper-address command is configured.Use the service dhcp command to reenable the functionality if necessary. If they have been disabled, the no service dhcp command will appear in the configuration file. You can verify whether they have been disabled by checking your configuration file. The Cisco IOS DHCP server and relay agent are enabled by default.Before you configure the DHCP relay agent, you should understand the concepts documented in the “DHCP Overview” module.Prerequisites for Configuring the Cisco IOS DHCP Relay Agent To access Cisco Feature Navigator, go to An account on is not required. #Book of travels servers not loading software#Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the Feature Information Table at the end of this document. For the latest feature information and caveats, see the release notes for your platform and software release. Your software release may not support all the features documented in this module. This module describes the concepts and tasks needed to configure the Cisco IOS DHCP relay agent. A DHCP relay agent is any host or IP router that forwards DHCP packets between clients and servers. Feature Information for the Cisco IOS DHCP Relay AgentĬonfiguring the Cisco IOS DHCP Relay AgentĪll Cisco routers that run Cisco software include a DHCP server and the relay agent software.Example: Setting the Gateway Address of the DHCP Broadcast to a Secondary Address Using Smart Relay Agent Forwarding.Example: Configuring Support for Relay Agent Information Option Encapsulation.Example: Configuring DHCP Relay Agent Support for MPLS VPNs.Example: Configuring DHCP Relay Class Support for Client Identification.Example: Configuring the Subscriber Identifier Suboption of the Relay Agent Information Option.Example: Configuring Per-Interface Support for the Relay Agent Information Option.Example: Configuring Support for the Relay Agent Information Option.Configuration Examples for the Cisco IOS DHCP Relay Agent.Configuring Route Addition for Relay and Server.Configuring Support for Private and Standard Suboption Numbers.Setting the Gateway Address of the DHCP Broadcast to a Secondary Address Using Smart Relay Agent Forwarding.Configuring Support for Relay Agent Information Option Encapsulation.Configuring DHCP Relay Agent Support for MPLS VPNs.Configuring DHCP Relay Class Support for Client Identification.Configuring the Subscriber Identifier Suboption of the Relay Agent Information Option.Configuring Per-Interface Support for the Relay Agent Information Option.Configuring Support for the Relay Agent Information Option.Specifying the Packet Forwarding Address.Prerequisites for Configuring the Cisco IOS DHCP Relay Agent.
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