=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.
=Enables STP on the specified ports.
Specifies the the cost of transmitting a frame on to a LAN through that port. It is assigned according to the speed of the bridge.
=Specifies the priority for each port.
Priority decides which port should be disabled when more than one port forms a loop in a switch. Ports with a higher priority numeric value are disabled first.
=Specifies which STP configuration these ports will participate in. (mrstp command only).
An example using
•Enable STP on the switch.
•Set the bridge priority of the switch to 0.
•Set the Hello Time to 4, Maximum Age to 20 and Forward Delay to 15 on the switch.
•Enable STP on port 10 with a path cost of 150.
•Set the priority for port 10 to 20.
ras(config)#
ras(config)#
ras(config)#
278 | Chapter 36 Configuration Mode Commands |