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7.5.2.3 ip helper-address
Use this command to configure the relay of certain UDP broadcast packets received on any interface. If
the interface that receives a UDP packet has been configured with an address, this global address value
will be ignored. This command can be invoked multiple times, either to specify multiple server addresses
for a given UDP port number or to specify multiple UDP port numbers handled by a specific server.
ip helper-address <ipaddr> { <udp-port> | dhcp | domain | isakmp | mobile-ip | nameserver |
netbios-dgm | netbios-ns | ntp | pim-auto-rp | rip | tacacs | tftp | time }
no ip helper-address <ipaddr> { <udp-port> | dhcp | domain | isakmp | mobile-ip | nameserver |
netbios-dgm | netbios-ns | ntp | pim-auto-rp | rip | tacacs | tftp | time }