Number of topology changes 5, last change occurred 00:34:37 ago on Te 1/1/1/1Port 375 (TenGigabitEthernet 1/1/2/1) is designated ForwardingPort path cost 20000, Port priority 128, Port Identifier 128.375Designated root has priority 4096, address 0001.e80d.b6:d6Designated bridge has priority 4096, address 0001.e80d.b6:d6Designated port id is 128.375 , designated path cost 0Number of transitions to forwarding state 2BPDU sent 1159, received 632The port is not in the Edge port modePort 385 (TenGigabitEthernet 1/1/1/1) is designated ForwardingPort path cost 20000, Port priority 128, Port Identifier 128.385Designated root has priority 4096, address 0001.e80d.b6:d6Designated bridge has priority 4096, address 0001.e80d.b6:d6Designated port id is 128.385 , designated path cost 0Modifying Global PVST+ ParametersThe root bridge sets the values for forward-delay and hello-time, and overwrites the values set on other PVST+ bridges.• Forward-delay — the amount of time an interface waits in the Listening state and the Learning state before it transitions to theForwarding state.• Hello-time — the time interval in which the bridge sends bridge protocol data units (BPDUs).• Max-age — the length of time the bridge maintains configuration information before it refreshes that information by recomputing thePVST+ topology.To change PVST+ parameters on the root bridge, use the following commands.• Change the forward-delay parameter.PROTOCOL PVST modevlan forward-delayThe range is from 4 to 30.The default is 15 seconds.• Change the hello-time parameter.PROTOCOL PVST modevlan hello-timeNOTE: With large configurations (especially those configurations with more ports), Dell Networking recommendsincreasing the hello-time.The range is from 1 to 10.The default is 2 seconds.• Change the max-age parameter.PROTOCOL PVST modevlan max-ageThe range is from 6 to 40.The default is 20 seconds.The values for global PVST+ parameters are given in the output of the show spanning-tree pvst command.Per-VLAN Spanning Tree Plus (PVST+) 689
