Setting a static path MTU for an IPv6 address
About static path MTU for an IPv6 address
You can set a static path MTU for an IPv6 address. Before sending a packet to the IPv6 address, the device compares the output interface MTU with the static path MTU. If the packet size exceeds the smaller one of the two values, the device fragments the packet according to the smaller value. After sending the fragmented packets, the device dynamically finds the path MTU to a destination host (see "IPv6 path MTU discovery").
Procedure
Enter system view.
system-view
Set a static path MTU for an IPv6 address.
ipv6 pathmtu [ vpn-instance vpn-instance-name ] ipv6-address value
By default, no path MTU is set for any IPv6 address.