ipv4-prefix length

Function

The ipv4-prefix length command specifies the IPv4 prefix length of the 6RD tunnel.

The undo ipv4-prefix length command deletes the IPv4 prefix length of the 6RD tunnel.

Format

ipv4-prefix length ipv4-prefix-length

undo ipv4-prefix length

Parameters

Parameter	Description	Value
ipv4-prefix-length	Specifies the IPv4 prefix length of the 6RD tunnel.	It is an integer ranging from 0 to 31.

Views

Tunnel interface view

Default Level

2: Configuration level

Usage Guidelines

The IPv4 prefix length indicates that the high-order bits of prefix-length are deleted from the source IPv4 address of the tunnel and other bits form a part of the 6RD prefix. The 6RD delegated prefix can be calculated by combining the 6RD prefix and the IPv4 prefix length.

This command is available only when the tunnel encapsulation mode is set to 6RD. Configure the tunnel-protocol 6rd command firstly.

Example

# Set the IPv4 prefix length for the 6RD tunnel to 8.

<sysname> system-view
[sysname] interface tunnel 1
[sysname-Tunnel1] tunnel-protocol ipv6-ipv4 6rd
[sysname-Tunnel1] ipv4-prefix length 8