Listening State - Cisco 7609 Configuration Manual

Cisco ios software configuration guide—12.1e

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Configuring STP and IEEE 802.1s MST

Listening State

The listening state is the first transitional state a Layer 2 LAN port enters after the blocking state. The

Layer 2 LAN port enters this state when STP determines that the Layer 2 LAN port should participate

in frame forwarding.

Figure 15-4 Interface 2 in Listening State

A Layer 2 LAN port in the listening state performs as follows:

BPDU and network

management frames

Discards frames received from the attached segment.

Discards frames switched from another LAN port for forwarding.

Does not incorporate end station location into its address database. (There is no learning at this

point, so there is no address database update.)

Receives BPDUs and directs them to the system module.

Receives, processes, and transmits BPDUs received from the system module.

Receives and responds to network management messages.

shows a Layer 2 LAN port in the listening state.

and data frames

Cisco 7600 Series Router Cisco IOS Software Configuration Guide—12.1E

Understanding How STP Works