Saving Dhcp Snooping Entries - HP 5920 Series Configuration Manual

Step
4. (Optional.) Configure a
handling strategy for DHCP
requests containing Option
82.
5. (Optional.) Configure the
padding content and code
type for the circuit ID
sub-option.
6. (Optional.) Configure the
padding content and code
type for the remote ID
sub-option.

Saving DHCP snooping entries

DHCP snooping entries cannot survive a reboot. If the DHCP snooping device is rebooted, security
features (such as IP source guard) that use DHCP snooping entries to authenticate users reject requests
from clients until new entries are learned.
To avoid this problem, you can save DHCP snooping entries in a file so that DHCP snooping can read
DHCP snooping entries from this file during a reboot.
NOTE:
If you disable DHCP snooping with the undo dhcp snooping enable command, the device deletes all
DHCP snooping entries, including those stored in the specified file.
To save DHCP snooping entries:
Step
1. Enter system view.
2. Specify a file to save DHCP
snooping entries.
3. (Optional.) Manually save
DHCP snooping entries to the
file.
4. (Optional.) Set the interval at
which DHCP snooping entries
are saved to the file.
Command
dhcp snooping information strategy { drop
| keep | replace }
dhcp snooping information circuit-id
{ [ vlan vlan-id ] string circuit-id | { normal |
verbose [ node-identifier { mac | sysname
| user-defined node-identifier } ] } [ format
{ ascii | hex } ] }
dhcp snooping information remote-id
{ normal [ format { ascii | hex } ] | [ vlan
vlan-id ] string remote-id | sysname }
Command
system-view
dhcp snooping binding database
filename filename
dhcp snooping binding database
update now
dhcp snooping binding database
update interval seconds
65
Remarks
By default, the handling
strategy is replace.
By default, the padding
format is normal and the
code type is hex for the
circuit ID sub-option.
By default, the padding
format is normal and the
code type is hex for the
remote ID sub-option.
Remarks
N/A
By default, no file is specified.
DHCP snooping entries are saved to
the specified file after you execute
this command and are updated at
the interval set by the dhcp snooping
binding database update interval
command.
DHCP snooping entries are saved to
the file each time this command is
executed.
The default interval is 300 seconds.