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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 the specified IPv6 address, in the range of 1280 to 10240 bytes.
Usage guidelines
You can configure a static Path MTU for a 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 an 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.
Syntax
ipv6 pathmtu age age-time
undo ipv6 pathmtu age
Default
The aging time for dynamic Path MTU is 10 minutes.
Views
System view
Predefined user roles
network-admin
Parameters
age-time: Specifies the aging time for Path MTU in minutes, in the range of 10 to 100.
Usage guidelines
After the path MTU from a source host to a destination host is dynamically determined, the source
host sends subsequent packets to the destination host based on this MTU. After the aging time
expires:
The dynamic Path MTU is removed.
The source host re-determines a dynamic path MTU through the Path MTU mechanism.
The aging time is invalid for a static Path MTU.
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