D-Link DES-3326S - Switch - Stackable Uživatelská příručka stáhnout pdf (Strana 322)

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DES-3326S Layer 3 Fast Ethernet Switch User’s Guide

322 Understanding and Troubleshooting the Spanning Tree Protocol

Listening State

The listening state is the first transition for a port from the

blocking state. Listening is an opportunity for the switch to

receive BPDUs that may tell the switch that the port should

not continue to transition to the forwarding state, but should

return to the blocking state (that is, a different port is a better

choice).

There is no address learning or packet forwarding from a port

in the listening state.

A port in the listening state does the following:

• Discards frames received from the network segment to

which it is attached.

• Discards packets sent from another port on the switch

for forwarding.

• Does not add addresses to its forwarding database

• Receives BPDUs and directs them to the CPU.

• Processes BPDUs received from the CPU.

• Receives and responds to network management

messages.

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