ZyXEL Communications SAM1316-22, User Manual

Page: 317 / 464

Chapter 49 DHCP Commands
SAM1316-22 User’s Guide
317
49.3.3 Option 82 Sub-option 2 Set Command
Syntax:
ras> switch dhcprelay opt82sub2 set <vid>|all [<relay info>]
where
This command adds the specified information for the relay agent for the specified
VLAN.
49.4 DHCP Snoop Commands
Use these commands to configure or show DHCP snooping settings on the
subscriber ports. The system gets the client MAC-IP address information (in the
reply from a DHCP server) and stores it in the DHCP snooping table. The system
only forwards packets from the clients whose MAC-IP address is in the DHCP
snooping table. Packets from unknown IP address(es) are not forwarded
(dropped). This feature prevents clients from assigning their own static IP
addresses.
49.4.1 DHCP Snoop Enable Command
Syntax:
ras> switch dhcpsnoop enable <portlist>
where
<vid> =
The ID of the VLAN served by the specified DHCP
server(s).
[<relay info>] =
Up to 23 ASCII characters of additional information for
the SAM1316-22 to add to the DHCP requests that it
relays to a DHCP server.
Examples of information you could add would be the
name of the SAM1316-22 or the ISP.
<portlist> =
You can specify a single port <1>, all ports <*> or a list
of ports <1,3,enet1>. You can also include a range of
ports <1,5,6~8,enet1>.