configure forwarding switching-mode

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


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.



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 ExtremeSwitching X670-G2, cut-through can be achieved for all packet sizes.

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


This command was first available in ExtremeXOS 12.3.

Platform Availability

Cut-through forwarding mode is supported only on the 40G ports of the ExtremeSwitching X670-G2, X870, and X690 series switches; and all ports on the ExtremeSwitching X695 and X870 series switches (subject to limitation on the source and destination port speeds if the source port speed is faster than the destination).