Dell N1100-ON, Reference Manual

Page: 1452 / 2332

Layer 3 Routing Commands
1452
User Guidelines
Enable DHCP Relay using the ip helper enable command. The interface
configuration always takes precedence over global configuration. However, if
there is no interface configuration, then global configuration is followed. Use
the ip dhcp relay information option command to globally enable inclusion
of Option 82 information in DHCP requests forwarded to a DHCP server.
Example
The following example enables the circuit ID and remote agent ID options on
VLAN 10.
console(config)#interface vlan 10
console(config-if-vlan10)#ip dhcp relay information option-insert
ip helper-address (global configuration)
Use the ip helper-address (global configuration) command to configure the
relay of certain UDP broadcast packets received on any interface. To delete an
IP helper entry, use the no form of this command.
Syntax
ip helper-address server-address [dest-udp-port | dhcp | domain | isakmp |
mobile-ip | nameserver | netbios-dgm | netbios-ns | ntp | pim-auto-rp | rip
| tacacs | tftp | time ]
no ip helper-address [server-address] [dest-udp-port | dhcp | domain |
isakmp | mobile-ip | nameserver | netbios-dgm | netbios-ns | ntp | pim-
auto-rp | rip | tacacs | tftp | time ]
• server-address — The IPv4 unicast or directed broadcast address to which
relayed UDP broadcast packets are sent. The server address cannot be an
IP address configured on any interface of the local router.
• 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),