Synchronization Of Port Roles - Cisco nexus 5000 series Cli Configuration Manual
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Chapter 1
Configuring Rapid PVST+
S e n d f e e d b a c k t o n x 5 0 0 0 - d o c f e e d b a c k @ c i s c o . c o m
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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:
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•
•
•
•
Summary of Port States
Table 1-3
inclusion in the active topology.
Table 1-3
Operational Status
Enabled
Enabled
Enabled
Disabled
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:
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•
If a designated port is in the forwarding state and is not configured as an edge port, it transitions to the
blocking state when the Rapid PVST+ forces it to synchronize with new root information. In general,
when the Rapid PVST+ forces a port to synchronize with root information and the port does not satisfy
any of the above conditions, its port state is set to blocking.
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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.
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.
lists the possible operational and Rapid PVST+ states for ports and the corresponding
Port State Active Topology
Port State
Blocking
Learning
Forwarding
Disabled
That port is in the blocking state.
It is an edge port (a port configured to be at the edge of the network).
Is Port Included in the
Active Topology?
No
Yes
Yes
No
Cisco Nexus 5000 Series Switch CLI Software Configuration Guide
Information About Rapid PVST+
1-13
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