3Com 4500 PWR 26-Port Configuration Manual page 504

To do...
Enter Ethernet port view
Co nfigure the circuit ID
s b-option in Option 82 u
If you have co nfigured a circuit ID with the vlan vlan-id argument specified, and the other one
without the argument in Ethernet port view, the former circuit 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 co
respectively. When Option 82 is added, however,
configured on the primary port.
The c ircuit ID s ub-option confi
aggregation nor supp
Configuring the remote ID s
Y ou can configure the remote ID sub-option in system view or Ethernet port view:
In system view, the remot
system name (sysna
In Ethernet port view, the remote ID tak
Option 82 as any customized character string in the ASCII format for different VLANs. That is to
say, you ca n add diff
F ollow these steps to
To do...
Enter system view
Configure the remote ID
sub-option in sy stem view
Enter Etherne t port view
Configure the remote ID
sub-option in Ethernet port view
Use the command...
interface interface-type
interface-number
dhcp-snooping
information [ vlan vlan-id ]
circuit-id string string
gured on a port will ne
ort XRN .
ub-option
e ID takes effect on all interfaces. You can configure Option 82 as the
me) of the device or any customized character string in the ASCII format.
es effect only on the current interface. You can configure
erent configuration rule
configure the remo te ID sub-optio
Use the command...
system-view
dhcp -snooping
information remote-id
{ sysname | string string }
interface interface-type
interface-number
dh cp -snooping
inf ormation [ vlan vlan-id ]
remote-id string string
—
Optional
By default, the
sub-option contains the VLAN ID
and port index related to the port
that receives DHCP request
packets from DHCP clients
mmand to configure the primary and member ports
the circuit ID sub-option is subject to the one
ither be synchronized in the case of port
s for packets from diffe
n in Option 82:
—
O ptional
By de
sub-option is
the DHCP snooping device that
received the DHCP client's
reques
—
Optional
By default, the remote ID
sub-option is the MAC address of
the DHCP snooping device that
received the client's request.
41-8
Remarks
circuit ID
rent VLANs.
Remarks
fault, th e remote ID
the MAC ad dress of
t.