set port jumbo

Use this command to enable or disable jumbo frame support on one or more ports.

Syntax

Parameters

Defaults

None.

Mode

All command modes.

Usage

By default, jumbo frame support is disabled on all ports and path MTU discovery is enabled. When jumbo frame support is enabled, path MTU discovery should also be enabled. For details on setting the path MTU state, refer to set mtu.

It is possible for the jumbo administrative status to be enabled and the jumbo operational status to be deferred. Jumbo frame support is supported on all module ports.

Some S-Series modules can only handle 12 jumbo frames enabled ports at one time without a reset. Resetting the module will enable deferred ports.

If jumbo support has not been manually configured, or if no port number is listed when enabling jumbo frame support on an S-Series module that only supports 12 jumbo ports, the first 12 ports will be set for jumbo support. Under these circumstances, selection of ports 1 - 12 will not require a reset. If Ports 13 or higher are selected, jumbo resources are withdrawn from ports 1 - 12 and a module reset is required. For these S-Series modules, any combination of 12 ports will support Jumbos.

See the show port jumbo to verify the operational status of a jumbo enabled port on the S- K- or 7100-Series. A jumbo administratively disabled port will always have a jumbo operational status of disabled.

If on the S and K-Series you have manually enabled the maximum number of ports allowed on the module, and you attempt to enable additional ports, the additional jumbo frame configurations will fail. You must free up resources by disabling jumbo frames on a port for each additional port you are trying to add before continuing.

By default maximum jumbo MTU is set to 10239 bytes for untagged packets and supports 10243 bytes for tagged packets. This maximum jumbo MTU size can be modified to a value between 1000 – 10239 using set port jumbo mtu.

The 7100-Series platform supports the forwarding of unicast, multicast, and broadcast jumbo frames.