Configuring Dhcp Snooping Entry Auto Backup - H3C SR8800-F Configuration Manual

Step
3. Enable DHCP snooping to
support Option 82.
4. (Optional.) Configure a
handling strategy for DHCP
requests that contain
Option 82.
5. (Optional.) Configure the
padding mode and padding
format for the Circuit ID
sub-option.
6. (Optional.) Configure the
padding mode and padding
format for the Remote ID
sub-option.

Configuring DHCP snooping entry auto backup

About DHCP snooping entry auto backup
The auto backup feature saves DHCP snooping entries to a backup file, and allows the DHCP
snooping device to download the entries from the backup file at device reboot. The entries on the
DHCP snooping device cannot survive a reboot. The auto backup helps the security features provide
services if these features (such as IP source guard) must use DHCP snooping entries for user
authentication.
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 backup file.
Procedure
To save DHCP snooping entries:
Step
1. Enter system view.
2. Configure the DHCP
snooping device to back up
DHCP snooping entries to a
file.
3. (Optional.) Manually save
DHCP snooping entries to
the backup file.
Command
dhcp snooping information enable
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 |
url url [ username username
[ password { cipher | simple }
string ] ] }
dhcp snooping binding
database update now
161
Remarks
By default, DHCP snooping
does not support Option
82.
By default, the handling
strategy is replace.
By default, the padding
mode is normal and the
padding format is hex for
the Circuit ID sub-option.
By default, the padding
mode is normal and the
padding format is hex for
the Remote ID sub-option.
Remarks
N/A
By default, the DHCP snooping
device does not back up DHCP
snooping entries.
With this command executed, the
DHCP snooping device backs up
DHCP snooping entries
immediately and runs auto backup.
This command automatically
creates the file if you specify a
non-existent file.
N/A