Cisco CCNP / BCMSN Test Tutorial: The Four (Or 5) STP Port States
For a CCNP applicant and a CCNA, you might be tempted to skip or perhaps look through the numerous particulars of Spanning Tree Protocol. In any case, you realized all of that inside your CCNA scientific studies, ideal? That’s proper, but it really by no means hurts to evaluation STP to get a switching exam! Apart from, many of us think about the 4 STP port states – but officially, there’s a fifth just one!
Disabled isn’t frequently regarded as an STP port condition, but Cisco does formally take into account this to generally be an STP condition. A disabled port is one that is administratively shut down.
As soon as the port is opened, the port will go into blocking condition. As the name 먹튀검증 implies, the port can’t do much During this condition – no body forwarding, no frame receiving, and thus no Mastering of MAC addresses. About The one thing this port can perform is settle for BPDUs from neighboring switches.
A port will then go from blocking mode into listening manner. The apparent problem is “listening for what?” Listening for BPDUs – and this port can now ship BPDUs also. The port however can’t ahead or get knowledge frames.
Once the port goes from listening mode to Studying manner, it’s on the point of mail and obtain frames. In Studying manner, the port commences to master MAC addresses in preparation for adding them to its MAC deal with desk.
Finally, a port can go into forwarding method. http://edition.cnn.com/search/?text=먹튀검증 This enables a port to ahead and receive details frames, mail and get BPDUs, and put MAC addresses in its MAC desk.
To see the STP manner of the offered interface, make use of the present spanning-tree interface command.
SW1#present spanning-tree interface quickly 0/eleven
Vlan Part Sts Value Prio.Nbr Variety
—————- —- — ——— ——– ———-
VLAN0001 Desg FWD 19 128.11 P2p
To discover these states in action, shut a port down within your CCNA / CCNP household lab and frequently run the display spanning interface command. After you see this in motion on actual Cisco gear, you’ll don't have any challenge with BCMSN exam questions. Just don’t exercise this or almost every other Cisco command over a creation network!