disableDisable PVST+ globally.C-Series, E-Series, S-Series, Z-Series, S4810Syntax disableTo enable PVST+, use the no disable command.Defaults Disabled.Command Modes CONFIGURATION (conf-pvst)Command History Version 8.3.11.1 Introduced on the Z9000.Version 8.3.7.0 Introduced on the S4810.Version 7.6.1.0 Introduced on the S-Series.Version 7.5.1.0 Introduced on the C-Series.pre-Version6.2.1.1Introduced on the E-Series.RelatedCommandsprotocol spanning-tree pvst – enter PVST+ mode.extend system-idUse extend system ID to augment the Bridge ID with a VLAN ID so that PVST+ differentiate between BPDUs for eachVLAN. If for some reason on VLAN receives a BPDU meant for another VLAN, PVST+ will then not detect a loop, andboth ports can remain in forwarding state.C-Series, E-Series, S-Series, Z-Series, S4810Syntax extend system-idDefaults DisabledCommand Modes PROTOCOL PVSTCommand History Version 8.3.11.1 Introduced on the Z9000.Version 8.3.7.0 Introduced on the S4810.Version 8.3.1.0 Introduced.Example FTOS(conf-pvst)#do show spanning-tree pvst vlan 5 briefVLAN 5Executing IEEE compatible Spanning Tree ProtocolRoot ID Priority 32773, Address 0001.e832.73f7Root Bridge hello time 2, max age 20, forward delay 151168
