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Cisco CCNP / BCMSN Test Tutorial: The Four (Or 5) STP Port States

As being a CCNP prospect and a CCNA, you may be tempted to skip or just search the many information of Spanning Tree Protocol. In any case, you acquired all of that within your CCNA research, appropriate? That’s suitable, nonetheless it under no circumstances hurts to evaluation STP for the switching Examination! Besides, Many people visualize the 4 STP port states – but formally, there’s a fifth 1!

Disabled isn’t frequently considered an STP port point out, but Cisco does officially look at this to generally be an STP point out. A disabled port is one which is administratively shut down.

After the port is opened, the port will go into blocking state. Since the name implies, the port can’t do Considerably Within 배구분석 this point out – no body forwarding, no body acquiring, and thus no learning of MAC addresses. About the only thing this port can do is accept BPDUs from neighboring switches.

A port will then go from blocking mode into listening mode. The plain concern is “listening for what?” Listening for BPDUs – and this port can now ship BPDUs also. The port nonetheless can’t forward or acquire information frames.

If the port goes from listening method to Understanding manner, it’s on the brink of ship and obtain frames. In Studying manner, the port begins to discover MAC addresses in preparing for adding them to its MAC address table.

Last but not least, a port can go into forwarding mode. This permits a port to forward and receive knowledge frames, send out and get BPDUs, and place MAC addresses in its MAC desk.

To see the STP method of the specified https://en.search.wordpress.com/?src=organic&q=해외축구중계사이트 interface, utilize the display spanning-tree interface command.

SW1#demonstrate spanning-tree interface quickly 0/11

Vlan Position Sts Expense Prio.Nbr Variety

—————- —- — ——— ——– ———-

VLAN0001 Desg FWD 19 128.11 P2p

To discover these states in motion, shut a port down with your CCNA / CCNP home lab and constantly operate the demonstrate spanning interface command. When you see this in motion on actual Cisco machines, you’ll haven't any issue with BCMSN Examination concerns. Just don’t observe this or almost every other Cisco command on a generation network!