Upstream switch configuration

Cable appropriately to the upstream switch.

Upstream 10Gb ports should be in trunk mode.

Enable spanning tree on the ports. The mode can be STP, RSTP, MSTP, or PVST.

Designate one upstream switch as the root bridge by assigning it a priority number lower than the X10G switches.

Pre-8.0: the default setting is 32768 on both M6220 switches and the blades
8.0 and higher: the default setting is 57344 on the switches and 61440 on the blades.