configure forwarding switching-mode

configure forwarding switching-mode [cut-through | store-and-forward]

Description

Configures the switching mode as either cut-through or store-and-forward.

Syntax Description

cut-through Specifies that a packet can begin being transmitted prior to its being received in full.
store-and-forward Specifies that a packet is transmitted only after the entire packet has been received and stored in the packet memory.

Default

Store-and-forward.

Usage Guidelines

Use this command to configure the switch to begin transmitting a packet before its entire contents have been received. This reduces the forwarding latency of the switch.

Cut-through mode cannot be achieved for packet sizes that are less than or equal to 384 bytes. On the Summit X770 and X670-G2, cut-through can be achieved for all packet sizes.

To display the switch mode settings, use the show forwarding configuration command.

History

This command was first available in ExtremeXOS 12.3.

Platform Availability

Cut-through forwarding mode is supported only on the 40G ports of the Summit X770, ExtremeSwitching X590, X670-G2, X870, and X690 series switches; and 100G ports on ExtremeSwitching X870 series switches.