dhcpv6 lease-proxy rate-limit

Function

The dhcpv6 lease-proxy rate-limit command configures the CAR Bandwidth for Lease Proxy Rate Limiting.

The undo dhcpv6 lease-proxy rate-limit command restores the default bandwidth of the lease proxy CAR.

By default, the lease proxy rate limit is 256.

This command is supported only on the NetEngine 8000 F1A.

Format

dhcpv6 lease-proxy rate-limit rate-value

undo dhcpv6 lease-proxy rate-limit rate-value

Parameters

Parameter	Description	Value
rate-value	Lease·proxy·CAR·bandwidth·threshold.·The·unit·is·the·number·of·packets.	The value is an integer ranging from 128 to 2048.

Parameter

Description

Value

rate-value

Lease·proxy·CAR·bandwidth·threshold.·The·unit·is·the·number·of·packets.

The value is an integer ranging from 128 to 2048.

Views

Slot view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
bras-control	write

Usage Guidelines

Usage Scenario

After DHCPv6 lease proxy is enabled, due to the increase in the number of DHCPv6 renew packets, CP-CAR rate limiting on the number of host packets to be sent to the CPU by a DHCPv6 user is loosened, increasing the risks on device stability caused by extremely high traffic volume of host packets. You can run the dhcpv6 lease-proxy rate-limit command to configure the rate at which non-renew packets are sent to the main control board in a DHCPv6 scenario in order to prevent extremely high traffic volume of host packets and ensure stable system running.

Configuration Impact

Effective user types:

Layer 2 DHCPv6 lease proxy users
Layer 3 DHCPv6 lease proxy users
Layer 3 DHCPv6 non-lease proxy users on the same interface and in the same VLAN where DHCPv6 proxy lease users exist

Precautions

For the effective non-solicit packets, the number of non-renew packets sent by each board to the main control board for processing per second does not exceed the specified threshold.
For the effective solicit packets, the number of non-renew packets sent by each board to themain control board for processing per second does not exceed the specified threshold. The percentage value of the user access rate is automatically decreased based on the system status. Such a function can be configured using the access-speed adjustment system-state command.

Example

# Set the bandwidth of the lease proxy CAR to 300.

<HUAWEI> system-view
[~HUAWEI] slot 1
[~HUAWEI-slot-1] dhcpv6 lease-proxy rate-limit 300