4000 Router Series Layer 3 - IP Services Command Reference

255

[Sysname] interface ethernet 1/1

[Sysname-Ethernet1/1] ipv6 neighbors max-learning-num 10

ipv6 pathmtu

Use ipv6 pathmtu to configure a static Path MTU for a specific IPv6 address.

Use undo ipv6 pathmtu to remove the Path MTU configuration for a specific IPv6 address.

Syntax

ipv6 pathmtu [ vpn-instance vpn-instance-name ] ipv6-address value

undo ipv6 pathmtu [ vpn-instance vpn-instance-name ] ipv6-address

Default

No static Path MTU is configured.

Views

System view

Predefined user roles

network-admin

Parameters

vpn-instance vpn-instance-name: Specifies the MPLS L3VPN instance that the Path MTU belongs to. The

vpn-instance-name argument is a case-sensitive string of 1 to 31 characters. If the Path MTU is for the

public network, do not specify this option.

ipv6-address: IPv6 address.

value: Specifies the Path MTU of a specific IPv6 address, in the range of 1280 to 10240 bytes.

Usage guidelines

You can configure a static Path MTU for a specific destination IPv6 address. When a source host sends

a packet through an interface, it compares the interface MTU with the static Path MTU of the specified

destination IPv6 address. If the packet size is larger than the smaller one of the two values, the host

fragments the packet according to the smaller value.

Examples

# Configure a static Path MTU for a specific IPv6 address.

<Sysname> system-view

[Sysname] ipv6 pathmtu fe80::12 1300

Related commands

• display ipv6 pathmtu

• reset ipv6 pathmtu

ipv6 pathmtu age

Use ipv6 pathmtu age to configure the aging time for a dynamic Path MTU.

Use undo ipv6 pathmtu age to restore the default.