Configuring Dhcp Snooping Entries Backup - HP 6125G Configuration Manual

Step
5. Configure Option
82 in the
non-user-defined
padding format.
6. Configure
user-defined
Option 82.

Configuring DHCP snooping entries backup

DHCP snooping entries cannot survive a reboot. If the DHCP snooping device is rebooted, security
modules (such as IP source guard) that use DHCP snooping entries to authenticate users will reject
requests from clients until new entries are learned.
The DHCP snooping entries backup feature enables you to store DHCP snooping entries in a file. When
the DHCP snooping device reboots, it reads DHCP snooping entries from this file.
After DHCP snooping is disabled with the undo dhcp-snooping command, the device will delete all
DHCP snooping entries, including those stored in the file.
Command
•
Configure the padding format for
Option 82:
dhcp-snooping information format
{ normal | private private |
standard | verbose [ node-identifier
{ mac | sysname | user-defined
node-identifier } ] }
•
Configure the code type for the
circuit ID sub-option:
dhcp-snooping information
circuit-id format-type { ascii | hex }
•
Configure the code type for the
remote ID sub-option:
dhcp-snooping information
remote-id format-type { ascii | hex }
•
Enable sub-option 9:
dhcp-snooping information [ vlan
vlan-id ] sub-option sub-option-code
•
Configure the padding content for the
circuit ID sub-option:
dhcp-snooping information [ vlan
vlan-id ] circuit-id string circuit-id
•
Configure the padding content for the
remote ID sub-option:
dhcp-snooping information [ vlan
vlan-id ] remote-id string { remote-id |
sysname }
•
Configure the padding content for the
sub-option 9:
dhcp-snooping information [ vlan
vlan-id ] sub-option sub-option-code
[ string user-string&<1-8> ]
54
Remarks
Optional.
By default,
•
The padding format for Option 82 is
normal.
•
The code type for the circuit ID
sub-option depends on the padding
format of Option 82. Each field has its
own code type.
•
The code type for the remote ID
sub-option is hex.
•
Sub-option 9 is not enabled
Hex configuration applies to private
padding format only.
The code type configuration for the
circuit ID sub-option and remote ID
sub-option apply to non-user-defined
Option 82 only.
For sub-option 9, when append strategy
is adopted, the sysname and the primary
IP address of the Loopback0 interface
are padded. When some other strategy
is adopted, only the sysname is padded.
Optional.
By default,
•
The padding content for the circuit
ID sub-option depends on the
padding format of Option 82.
•
The padding content for the
remote ID sub-option depends on
the padding format of Option 82.
•
Sub-option 9 is not padded.