HP MSR2000/3000/4000 Router Series Layer 3 - IP Services Configuration Guide

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Ste
p
Command Remarks
6. (Optional.) Configure the
padding content and code
type for the remote ID
sub-option.
dhcp snooping information remote-id
{ normal [ format { ascii | hex } ] | [ vlan
vlan-id ] string remote-id | sysname }
By default, the padding
format is normal and the
code type is hex 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:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Specify a file to save DHCP
snooping entries.
dhcp snooping binding database
filename { filename | url url
[ username username
[ password { cipher | simple }
key ] ] }
By default, no file is specified.
This command enables the device to
immediately save DHCP snooping
entries to the specified database file.
If the file does not exist, the device
automatically creates the file. The
device does not update the file for a
specified amount of time after a
DHCP snooping entry changes. The
default period is 300 seconds. To
change the value, use the dhcp
snooping binding database update
interval command.
3. (Optional.) Manually save
DHCP snooping entries to the
file.
dhcp snooping binding database
update now
DHCP snooping entries are saved to
the database file each time this
command is executed.
4. (Optional.) Set the amount of
time to wait after a DHCP
snooping entry changes
before updating the database
file.
dhcp snooping binding database
update interval seconds
The default setting is 300 seconds.
When a DHCP snooping entry is
learned or removed, the device does
not update the database file until
after the specified waiting period.
All changed entries during that
period will be updated.