dhcpv6 upgrade

Function

The dhcpv6 upgrade command configures leases of all DHCPv6 users on a BRAS.

The undo dhcpv6 upgrade command deletes the configuration.

By default, DHCPV6 user's lifetime is forbidden.

This command is supported only on the NetEngine 8000 F1A.

Format

dhcpv6 upgrade preferred-lifetime preferred-days [ preferred-hours [ preferred-minutes ] ] valid-lifetime valid-days [ valid-hours [ valid-minutes ] ] [ renew-time-percent renew-time-value ] [ rebind-time-percent rebind-time-value ]

undo dhcpv6 upgrade

Parameters

Parameter	Description	Value
valid-lifetime valid-days	Specify the days of valid-lifetime.	The value is an integer that ranges from 0 to 999.
valid-lifetime valid-hours	Specify the hours of valid-lifetime.	The value is an integer that ranges from 0 to 23.
valid-lifetime valid-minutes	Specify the minutes of valid-lifetime.	The value is an integer that ranges from 0 to 59.
renew-time-percent renew-time-value	Renew time percent.	The value is an integer that ranges from 1 to 98.
rebind-time-percent rebind-time-value	Rebind time percent.	The value is an integer that ranges from 2 to 99.
preferred-lifetime preferred-days	Specify the days of preferred-lifetime.	The value is an integer that ranges from 0 to 999.
preferred-lifetime preferred-hours	Specify the hours of preferred-lifetime.	The value is an integer that ranges from 0 to 23.
preferred-lifetime preferred-minutes	Specify the minutes of preferred-lifetime.	The value is an integer that ranges from 0 to 59.

Views

System view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
dhcpv6	write

Usage Guidelines

Usage Scenario

On a device from which DHCPv6 users go online in IPoE mode, the IP addresses and prefixes are delivered by the RADIUS server or assigned from local address pools or delegation address pools.Before upgrading the device, run the dhcpv6 upgrade command to modify leases of these users to a shorter period, so that DHCPv6 users can go online by sending Renew packets after the upgraded device is restarted.

After the dhcpv6 upgrade command is run, you can run the display dhcpv6 upgrade command to view the configuration result and calculate the restart time of the NetEngine 8000 F based on the previous lease.

This command applies to both Layer 2 and Layer 3 DHCPv6 users.

The preferred-lifetime and valid-lifetime should be configured no smaller than 30 minutes, renew-time and rebind-time must be greater than or equal to 15 minutes.

Configuration Impact

After the dhcpv6 upgrade command is run, all DHCP users use the globally configured lease, no matter whether their IP addresses and prefixes are delivered by the RADIUS server or assigned from local address pools and delegation address pools.

If a short lease is configured, CPU usage will rise when many DHCP users send renewal messages at the same time.

Follow-up Procedure

Precautions

In a non-BRAS-upgrade scenario, do not configure a short address lease.

Example

# Set the renew time percent as 70%.

<HUAWEI> system-view
[~HUAWEI] dhcpv6 upgrade preferred-lifetime 999 23 59 valid-lifetime 999 23 59 renew-time-percent 70