ZyXEL Communications AAM1212-51, Руководство пользователя, Страница: 291 / 435

AAM1212-51/53 Series User’s Guide
Chapter 44 DHCP Commands 291
This command turns on the DHCP relay agent information (Option 82, Sub-option 2) feature.
44.3.2 Option 82 Sub-option 2 Disable Command
Syntax:
ras> switch dhcprelay opt82sub2 disable
This command turns off the DHCP relay agent information (Option 82, Sub-option 2) feature.
44.3.3 Option 82 Sub-option 2 Set Command
Syntax:
ras> switch dhcprelay opt82sub2 set [<relay info>]
where
This command adds the specified information for the relay agent.
44.4 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.
44.4.1 DHCP Snoop Enable Command
Syntax:
ras> switch dhcpsnoop enable <portlist>
[<relay info>] =
Up to 23 ASCII characters of additional information for the
AAM1212 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 AAM1212 or the ISP.