278
Step Command Remarks
3. Enable support for Option
18.
ipv6 dhcp snooping option
interface-id enable
By default, Option 18 is not
supported.
4. (Optional.) Specify the
content as the interface ID.
ipv6 dhcp snooping option
interface-id
[
vlan
vlan-id
]
string
interface-id
By default, the DHCPv6 snooping
device uses its DUID as the
content for Option 18.
5. Enable support for Option
37.
ipv6 dhcp snooping option
remote-id enable
By default, Option 37 is not
supported.
• (Optional.) Specify the
content as the remote ID.
ipv6 dhcp snooping option
remote-id
[
vlan
vlan-id
]
string
remote-id
By default, the DHCPv6 snooping
device uses its DUID as the
content for Option 37.
Configuring DHCPv6 snooping entry auto backup
The auto backup function saves DHCPv6 snooping entries to a backup file, and allows the DHCPv6
snooping device to download the entries from the backup file at reboot. The entries on the DHCPv6
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 DHCPv6 snooping entries for user
authentication.
IMPORTANT:
If you disable DHCPv6 snooping with the undo ipv6 dhcp snooping enable command, the device
deletes all DHCPv6 snooping entries, including those stored in the backup file.
To configure DHCPv6 snooping entry auto backup:
Step Command Remarks
1. Enter system view.
system-view
N/A
2. Configure the DHCPv6
snooping device to back
up DHCPv6 snooping
entries to a file.
ipv6 dhcp snooping
binding database
filename
{ filename |
url
url [
username
username
[
password
{
cipher
|
simple
} key ] ] }
By default, the DHCPv6 snooping device
does not back up the DHCPv6 snooping
entries.
With this command executed, the DHCPv6
snooping device backs up DHCPv6 snooping
entries immediately and runs auto backup.
This command automatically creates the file if
you specify a non-existent file.
3. (Optional.) Manually save
DHCPv6 snooping entries
to the backup file.
ipv6 dhcp
snooping
binding
database
update
now
N/A
4. (Optional.) Set the waiting
time after a DHCPv6
snooping entry change for
the DHCPv6 snooping
device to update the
backup file.
ipv6 dhcp
snooping
binding
database
update
interval
seconds
The default waiting time is 300 seconds.
The waiting period starts when a DHCPv6
snooping entry is learned, updated, or
removed. The DHCPv6 snooping device
updates the backup file when the specified
waiting period is reached. All changed entries
during the period will be saved to the backup
file.
If no DHCPv6 snooping entry changes, the
backup file is not updated.
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