Recall from Chapter 3 that Cisco switches support three major switching methods – FragmentFree, Cut-Through, and Store-and-Forward. The Catalyst 1900 series supports only two of these methods, FragmentFree and Store-and-Forward. FragmentFree is the method configured by default.
To view the current switching method enabled on a switch, use the show port system command. To change the switching method, use the switching-mode command followed by either fragment-free or store-and-forward. In the example below, I have changed the switching method to Store-and-Forward.
Cisco1912#show port system
Switching mode: FragmentFree
Use of store and forward for multicast: Disabled
Network port: None
Half duplex backpressure (10 Mbps ports): Disabled
Enhanced Congestion Control (10 Mbps ports): Disabled
Default port LED display mode: Port Status
Cisco1912#config t
Enter configuration commands, one per line. End with CNTL/Z
Cisco1912(config)#switching-mode store-and-forward
Cisco1912(config)#
