3Com 7757 Configuration Manual page 631

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Configuring IP Filtering
Table 503 Configure the remote ID sub-option in Option 82
Operation
Enter system view
Configure the remote ID
sub-option in system view
Enter Ethernet port view
Configure the remote ID
sub-option in Ethernet port
view
If you configure a remote ID sub-option in both system view and on a port, the
■
remote ID sub-option configured on the port applies when the port receives a
packet, and the global remote ID applies to other interfaces that have no
remote ID sub-option configured.
If you have configured a remote ID with the vlan vlan-id argument specified,
■
and the other one without the argument in Ethernet port view, the former
remote ID applies to the DHCP messages from the specified VLAN, while the
latter one applies to DHCP messages from other VLANs.
In a port aggregation group, you can use this command to configure the
■
primary and member ports respectively. When Option 82 is added, however,
the remote ID is subject to the one configured on the primary port.
The remote ID configured on a port will neither be synchronized in the case of
■
port aggregation.
Configuring the padding format for Option 82
Table 504 Configure the padding format for Option 82
Operation
Enter system view
Configure the padding format dhcp-snooping information
Table 505 Configure IP filtering
Operation
Enter system view
Enter Ethernet port view
Enable IP filtering
DHCP Snooping Configuration
Command
system-view
dhcp-snooping information
remote-id { sysname |
string string }
interface interface-type
interface-number
dhcp-snooping information
[ vlan vlan-id ] remote-id
string string
Command
system-view
packet-format { extended |
standard }
Command
system-view
interface interface-type
interface-number
ip check source ip-address
[ mac-address ]
631
Description
-
Optional
By default, the remote ID
sub-option is the MAC
address of the DHCP
snooping device that received
the DHCP client's request.
-
Optional
By default, the remote ID
sub-option is the MAC
address of the DHCP
snooping device that received
the client's request.
Description
-
Optional
By default, the padding
format is in extended format.
Description
-
-
Required
By default, this function is
disabled.