Wednesday, 4 May 2011

Optimizing Port configuration

Using switchport host command on Cisco 2900, 3550, 3560 series switches is a useful way to optimize switch port for host connection. When each switch port has a single host connected to it, you can use this command instead of manually setting the correct feature for every port.
This command sets channel mode to off, enables spanning tree portfast, sets the trunk mode off and disables the 802.1q tunnel features.
Note that this command should not be enabled on ports where hubs, switches or bridges are connected because it can cause temporary switching/ bridging loops.

Switch(config)# interface fastethernet 0/1
Switch(config-if)# switchport host

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