H3C Technologies H3C S3100 Series Switches - Manual (Page 543)

3-11
z 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.
z 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.
z 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.
z The remote ID configured on a port will not be synchronized in the case of port aggregation.
Configure the padding format for Option 82
Follow these steps to configure the padding format for Option 82:
Operation Command Description
Enter system view system-view —
Configure the padding format
dhcp-snooping information
packet-format { extended |
standard } Optional
By default, the padding format
is in extended format.
Configuring IP Filtering
Only the S3100-EI series among S3100 series switches support IP filtering.
Follow these steps to Configure IP filtering:
Operation Command Description
Enter system view system-view —
Enter Ethernet port view
interface interface-type
interface-number
—
Enable IP filtering
ip check source ip-address
[ mac-address ]
Required
By default, this function is
disabled.
Create an IP static binding
entry
ip source static binding
ip-address ip-address
[ mac-address mac-address ] Optional
By default, no static binding
entry is created.