33.3 Enabling STP
Use the
Syntax:
where
priority
=Enables STP on the switch.
=Specifies the bridge priority for the switch. The lower the numeric value you assign, the higher the priority for this bridge.
Bridge priority is used in determining the root switch, root port and designated port. The switch with the highest priority (lowest numeric value) becomes the STP root switch. If all switches have the same priority, the switch with the lowest MAC address will then become the root switch.
Bridge Priority determines the root bridge, which in turn determines Hello Time, Max Age and Forwarding Delay.
=Specifies the time interval in seconds between BPDU (Bridge Protocol Data Units) configuration message generations by the root switch.
=Specifies the maximum time (in seconds) a switch can wait without receiving a BPDU before attempting to reconfigure. All switch ports (except for designated ports) should receive BPDUs at regular intervals. Any port that ages out STP information (provided in the last BPDU) becomes the designated port for the attached LAN. If it is a root port, a new root port is selected from among the switch ports attached to the network.
=Specifies the maximum time (in seconds) a switch will wait before changing states. This delay is required because every switch must receive information about topology changes before it starts to forward frames. In addition, each port needs time to listen for conflicting information that would make it return to a blocking state; otherwise, temporary data loops might result.
Chapter 33 Configuration Mode Commands | 251 |