H3C H3C S5100-SI, Operation Manual, Page: 363 / 830

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In Ethernet port view, the remote ID takes effect only on the current interface. You can configure
Option 82 as any customized character string in the ASCII format for different VLANs. That is to say,
you can add different configuration rules for packets from different VLANs.
Follow these steps to configure the remote ID sub-option in Option 82:
To do… Use the command… Remarks
Enter system view system-view —
Configure the remote ID
sub-option in system view
dhcp-snooping information
remote-id
{ sysname | string
string }
Optional
By default, the remote ID
sub-option is the MAC address
of the DHCP snooping device
that received the DHCP client’s
request.
Enter Ethernet port view
interface interface-type
interface-number
—
Configure the remote ID
sub-option in Ethernet port view
dhcp-snooping information
[ vlan vlan-id ] remote-id
string string
Optional
By default, the remote ID
sub-option is the MAC address
of the DHCP snooping device
that received the client’s
request.
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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.
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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.
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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.
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The remote ID configured on a port will not be synchronized in the case of port aggregation.
Configuring the padding format for Option 82
Follow these steps to configure the padding format for Option 82:
To do… Use the command… Remarks
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.