Listening State; Learning State; Forwarding State; Disabled State - Cisco C3201FESMIC-TP= - 3201 Fast EN Switch Mobile Interface Card Expansion Module Software Configuration Manual

Wireless mic
Table of Contents

Advertisement

Spanning Tree Protocol in a Wireless Environment
Note
If an bridge port is blocked, some broadcast or multicast packets can reach a forwarding port on the
bridge and cause the bridging logic to switch the blocked port into listening state momentarily before
the packets are dropped at the blocked port.

Listening State

The listening state is the first state an interface enters after the blocking state. The interface enters this
state when STP determines that the interface should participate in frame forwarding.
An interface in the listening state performs as follows:

Learning State

An interface in the learning state prepares to participate in frame forwarding. The interface enters the
learning state from the listening state.
An interface in the learning state performs as follows:

Forwarding State

An interface in the forwarding state forwards frames. The interface enters the forwarding state from the
learning state.
An interface in the forwarding state performs as follows:

Disabled State

An interface in the disabled state does not participate in frame forwarding or in the spanning tree. An
interface in the disabled state is non-operational.
A disabled interface performs as follows:
Discards frames received on the port
Does not learn addresses
Receives BPDUs
Discards frames received on the port
Learns addresses
Receives BPDUs
Receives and forwards frames received on the port
Learns addresses
Receives BPDUs
Discards frames received on the port
Does not learn addresses
Does not receive BPDUs
Understanding Spanning Tree Protocol
Book Title
7

Hide quick links:

Advertisement

Table of Contents
loading

Table of Contents