Dell N3200-ON EMC Networking N-Series Switches CLI Reference Guide version 6.6 - Page 1483

• dest-udp-port - A destination UDP port number from 1 to 65535. This parameter need not be configured for DHCP. It must be configured for all other protocols which are to be relayed. • port-name - The destination UDP port may be optionally specified by its name. Whether a port is specified by its number or its name has no effect on behavior. The names recognized are as follows: dhcp (port 67), domain (port 53), isakmp (port 500), mobile-ip (port 434), nameserver (port 42), netbios-dgm (port 138), netbios-ns (port 137), ntp (port 123), pim-autorp (port 496), rip (port 520), tacacs (port 49), tftp (port 69), and time (port 37). Other ports must be specified by number. Default Configuration No helper addresses are configured. Command Mode Global Configuration mode, Virtual Router Configuration mode User Guidelines This command can be invoked multiple times, either to specify multiple server addresses for a given port number or to specify multiple port numbers handled by a specific server. Broadcast packets other than DHCP require configuration of a destination UDP port number for IP helper if they are not already listed in Table 6-1. The switch is able to supply the appropriate UDP destination port numbers by examining the DHCP message, so configuration of a UDP destination port is not required for unicast forwarding of DHCP. The command no ip helper-address with no arguments clears all global IP helper addresses. When in Virtual Router Configuration mode, this command operates within the context of the virtual router instance. When in Global Configuration mode, the command operates on the global router instance. Virtual Router Configuration mode is only available on the N3000ON/N3100-ON/N3200-ON switches. Example To relay DHCP packets received on any interface to two DHCP servers, 10.1.1.1 and 10.1.2.1, use the following commands: Layer 3 Routing Commands 1483