Port States - Cisco AJ732A - MDS 9134 Fabric Switch Configuration Manual

Cisco nexus 5000 series switch cli software configuration guide, nx-os 4.0(1a)n1 (ol-16597-01, january 2009)

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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

Alternate port

Designated port

Port States

This section describes the Rapid PVST+ and MST port states:

Rapid PVST+ Port State Overview

Propagation delays can occur when protocol information passes through a switched LAN. As a result,

topology changes can take place at different times and at different places in a switched network. When

a LAN port transitions directly from nonparticipation in the spanning tree topology to the forwarding

state, it can create temporary data loops. Ports must wait for new topology information to propagate

through the switched LAN before starting to forward frames.

Each LAN port on a software using Rapid PVST+ or MST exists in one of the following four states:

Sample Topology Demonstrating Port Roles

Rapid PVST+ Port State Overview, page 8-11

Blocking State, page 8-12

Learning State, page 8-12

Forwarding State, page 8-12

Disabled State, page 8-13

Summary of Port States, page 8-13

Blocking—The LAN port does not participate in frame forwarding.

Learning—The LAN port prepares to participate in frame forwarding.

Forwarding—The LAN port forwards frames.

Disabled—The LAN port does not participate in STP and is not forwarding frames.

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Cisco Nexus 5000 Series Switch CLI Software Configuration Guide

Information About Rapid PVST+

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