195
Step Command Remarks
2. Enter interface view.
• Enter Layer 2 Ethernet interface
view:
interface interface-type
interface-number
• Enter Layer 2 aggregate
interface view:
interface bridge-aggregation
interface-number
N/A
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.
6. (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.
Saving DHCPv6 snooping entries
DHCPv6 snooping entries cannot survive a reboot. You can save DHCPv6 snooping entries to a file so
that DHCPv6 snooping can read DHCPv6 snooping entries from this file during a reboot. This allows
security features (such as IP source guard) that use DHCPv6 snooping entries to continue to use these
entries to check the user validity of DHCPv6 clients.
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 specified database file.
To save DHCPv6 snooping entries:
Ste
Command
Remarks
1. Enter system view.
system-view N/A
2. Specify a file to store
DHCPv6 snooping entries.
ipv6 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 DHCPv6 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
specific amount of time after a DHCPv6
snooping entry changes. The default period is
300 seconds. To change the value, use the
ipv6 dhcp snooping binding database update
interval command.
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