Root Identifier has priority 4096, Address 0001.e80d.b6d6Root Bridge hello time 2, max age 20, forward delay 15Bridge Identifier has priority 4096, Address 0001.e80d.b6d6Configured hello time 2, max age 20, forward delay 15We are the root of VLAN 100Current root has priority 4096, Address 0001.e80d.b6d6Number of topology changes 5, last change occurred 00:34:37 ago on Te 1/32Port 375 (TenGigabitEthernet 1/22) 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 1/32) 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 otherPVST+ bridges.• Forward-delay — the amount of time an interface waits in the Listening state and the Learning statebefore it transitions to the Forwarding 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 thatinformation by recomputing the PVST+ 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), DellNetworking recommends increasing the hello-time.The range is from 1 to 10.The default is 2 seconds.• Change the max-age parameter.646 Per-VLAN Spanning Tree Plus (PVST+)
