• 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-auto-rp (port 496)
• rip (port 520)
• tacacs (port 49)
• tftp (port 69)
• time (port 37)
Routing Commands
257
M4100 Series ProSAFE Managed Switches
no ip helper-address
Use this command to remove the IP address from the previously configured list. The no
command without an <ip-address> argument removes the entire list of helper addresses
on that interface.
ip helper-address discard
Use this command to drop matching packets. Matching packets are discarded rather than
relayed, even if a global ip helper-address configuration matches the packet.
Parameter Description
<ip-address> The IPv4 unicast or directed broadcast address to which relayed UDP broadcast
packets are sent. The IP address cannot be in a subnet on the interface where the
relay entry is configured, and cannot be an IP address configured on any interface
of the local router.
<dest-udp-port> A destination UDP port number from 0 to 65535.
port name options 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:
Other ports must be specified by number.
Format no ip helper-address <ip-address> [<dest-udp-port> | dhcp | domain |
isakmp | mobile-ip | nameserver | netbios-dgm | netbios-ns | ntp |
pim-auto-rip | rip | tacacs | tftp | time]
Mode Interface Config
Format ip helper-address discard [<dest-udp-port> | dhcp | domain | isakmp
| mobile-ip | nameserver | netbios-dgm | netbios-ns | ntp |
pim-auto-rip | rip | tacacs | tftp | time]
Mode Interface Config
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