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Chapter 45 DHCP Commands

IES-612-51 User’s Guide

284

45.4 DHCP Relay Option 82 Sub-option 2 Commands

Use the following commands to configure the DHCP relay Option 82 (agent information)

feature, sub-option 2 (remote ID). This feature applies regardless of whether or not the DHCP

relay is on.

45.5 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 forwards packets from only 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.

In some cases, you might want to allow packets from an IP address not offered by the DHCP

server. This might apply, for example, to static IP addresses. In this case, you can specify the

IP address whose packets are allowed, and the IES-612-51 forwards these packets as well.

Table 103 DHCP Relay Option 82 Sub-option 2 Commands

COMMAND DESCRIPTION P

switch dhcprelay opt82sub2

enable <vid|all>

This command turns on the DHCP relay agent

information (Option 82, Sub-option 2) for the

specified VLAN or for all VLANs.

M/H

switch dhcprelay opt82sub2

disable <vid|all>

This command turns off the DHCP relay agent

information (Option 82, Sub-option 2) for the

specified VLAN or for all VLANs.

M/H

switch dhcprelay opt82sub2 set

<vid|all> <relay-info>

This command adds the specified information for

the relay agent (Option 82, Sub-option 2) for the

specified VLAN or for all VLANs.

relay-info: Up to 23 ASCII characters of

additional information for the IES-612-51 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 IES-612-51 or the ISP. To clear this

field, type a pair of double quotation marks with no

space between them (““).

M/H

Table 104 DHCP Snoop Commands

COMMAND DESCRIPTION P

switch dhcpsnoop enable <port-

list>

This command activates the DHCP snooping

feature on the specified port(s).

M/H

switch dhcpsnoop disable

<port-list>

This command disables the DHCP snooping feature

on the specified port(s).

M/H

switch dhcpsnoop flush <port-

list>

This command clears the DHCP snooping binding

table on the specified port(s). The system also

automatically clears the binding table when you

disable DHCP snooping.

M/H

switch dhcpsnoop show <port-

list>

Use this command to display the current DHCP

snooping settings of the specified port(s).

L/L

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