HP Cisco Nexus 5000 Cisco Nexus 5000 Series Switch CLI Software Configuration - Page 207

Information About Rapid PVST+ Disabled State • Forwards frames switched from another port for forwarding. • Incorporates the end station location information into its address database. • Receives BPDUs and directs them to the system module. • Processes BPDUs received from the system module. • Receives and responds to network management messages. Disabled State A LAN port in the disabled state does not participate in frame forwarding or STP. A LAN port in the disabled state is virtually nonoperational. A disabled LAN port performs as follows: • Discards frames received from the attached segment. • Discards frames switched from another port for forwarding. • Does not incorporate the end station location into its address database. (There is no learning, so there is no address database update.) • Does not receive BPDUs from neighbors. • Does not receive BPDUs for transmission from the system module. Summary of Port States The following table lists the possible operational and Rapid PVST+ states for ports and the corresponding inclusion in the active topology. Table 16: Port State Active Topology Operational Status Enabled Port State Blocking Is Port Included in the Active Topology? No Enabled Learning Yes Enabled Forwarding Yes Disabled Disabled No Synchronization of Port Roles When the switch receives a proposal message on one of its ports and that port is selected as the new root port, Rapid PVST+ forces all other ports to synchronize with the new root information. The switch is synchronized with superior root information received on the root port if all other ports are synchronized. An individual port on the switch is synchronized if either of the following applies: • That port is in the blocking state. • It is an edge port (a port configured to be at the edge of the network). OL-16597-01 Cisco Nexus 5000 Series Switch CLI Software Configuration Guide 161