Cisco CCNP / BCMSN Test Tutorial: The 4 (Or 5) 먹튀검증 STP Port States
To be a CCNP applicant along with a CCNA, you might be tempted to skip or simply search the many specifics of Spanning Tree Protocol. In any case, you figured out all of that in the CCNA scientific studies, correct? That’s suitable, but it surely never hurts to review STP for a switching Examination! Apart from, Many people consider the four STP port states – but officially, there’s a fifth one particular!
Disabled isn’t normally regarded as an STP port point out, but Cisco does officially contemplate this to become an STP point out. A disabled port is one which is administratively shut down.
When the port is opened, the port will go into blocking point out. As being the title implies, the port can’t do A lot In this particular point out – no body forwarding, no body receiving, and so no Finding out of MAC addresses. About the only thing this port can do is settle for BPDUs from neighboring switches.
A port will then go from blocking method into listening method. The obvious issue is “listening for what?” Listening for BPDUs – and this port can now send out BPDUs at the same time. The port still can’t ahead or acquire knowledge frames.
When the port goes from listening method to Studying manner, it’s on the point of send and get frames. In Mastering mode, the port begins to know MAC addresses in preparing for introducing them to its MAC handle desk.
Finally, a port can go into forwarding method. This allows a port to ahead and acquire information frames, ship and get BPDUs, and spot MAC addresses in its MAC desk.
To begin to see the STP method of the supplied interface, use the demonstrate spanning-tree interface command.
SW1#demonstrate spanning-tree interface rapidly 0/eleven
Vlan Position Sts Value Prio.Nbr Sort
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VLAN0001 Desg FWD 19 128.eleven P2p
To view these states in action, shut a port down in your CCNA / CCNP household lab and frequently operate the clearly show spanning interface command. When you finally see this in action on true Cisco products, you’ll haven't any problem with BCMSN exam thoughts. Just don’t observe this or every other Cisco command over a generation community!