Configuring Dhcp Snooping Entries Backup - HP 3600 v2 Series Configuration Manual

Step
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.
To configure DHCP snooping entries backup:
Step
1. Enter system view.
2. Specify the name of the file for
storing DHCP snooping
entries.
3. Back up DHCP snooping
entries to the file.
4. Set the interval at which the
DHCP snooping entry file is
refreshed.
Command
•
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> ]
Command
system-view
dhcp-snooping binding
database filename filename
dhcp-snooping binding
database update now
dhcp-snooping binding
database update interval
minutes
80
Remarks
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.
Remarks
N/A
Not specified by default.
DHCP snooping entries are stored
immediately after this command is
used and then updated at the
interval set by the dhcp-snooping
binding database update interval
command.
Optional.
DHCP snooping entries will be
stored to the file each time this
command is used.
Optional.
By default, the file is not refreshed
periodically.