Configures the IPv6 MTU on individual interfaces.

ipv6 mtu unit
no ipv6 mtu unit

By default, in non-jumbo mode, the default and maximum Ethernet MTU size is 1500 bytes. When jumbo mode is enabled, the default Ethernet MTU size is 9216.

unit
Specifies the maximum length of an IPv6 packet that can betransmitted on a particular interface. Valid values are between 1280 and 1500, or 1280 and 10178 if jumbo mode is enabled.

Interface configuration mode

The IPv6 maximum transmission unit (MTU) is the maximum length of an IPv6 packet that can be transmitted on a particular interface. If an IPv6 packet is longer than an MTU, the host that originated the packet fragments the packet and transmits its contents in multiple packets that are shorter than the configured MTU.

By default, in non-jumbo mode, the default and maximum Ethernet MTU size is 1500 bytes. When jumbo mode is enabled, the default Ethernet MTU size is 9216. The maximum Ethernet MTU size is 10178.

For ICX 7850 devices, the maximum jumbo frame size supported is 9380. When jumbo mode is enabled, the maximum ethernet MTU size is 9358 bytes.

The IPv6 MTU functionality is applicable to VEs and physical IP interfaces. It applies to traffic routed between networks. The minimum IPv4 and IPv6 MTU values for both physical and virtual interfaces are 1280.

IPv6 MTU cannot be configured globally. It is supported only on devices running Layer 3 software.

The no form of the command resets the MTU to the default values.

The following example configures the MTU on Ethernet interface 1/3/1 as 1280 bytes. 

device(config)# interface ethernet 1/3/1
device(config-if-e1000-1/3/1)# ipv6 mtu 1280