Cisco CCNP / 토토사이트 BCMSN Exam Tutorial: The 4 (Or Five) STP Port States
As being a CCNP prospect along with a CCNA, you might be tempted to skip or perhaps look through the numerous specifics of Spanning Tree Protocol. In the end, you realized all of that inside your CCNA scientific studies, proper? That’s appropriate, nevertheless it hardly ever hurts to review STP for a switching Examination! Moreover, many of us think of the 4 STP port states – but formally, there’s a fifth one!
Disabled isn’t frequently regarded as an STP port point out, but Cisco does formally look at this being an STP point out. A disabled port is one that is administratively shut down.
After the port is opened, the port will go into blocking point out. As being the identify indicates, the port can’t do Considerably In this particular state – no body forwarding, no body receiving, and for that reason no Mastering of MAC addresses. About The one thing this port can perform is take BPDUs from neighboring switches.
A port will then go from blocking manner into listening manner. The apparent concern is “listening for what?” Listening for BPDUs – which port can now send BPDUs as well. The port nonetheless can’t forward or obtain info frames.
When the port goes from listening method to Mastering method, it’s on the point of deliver and acquire frames. In Studying manner, the port commences to learn MAC addresses in preparation for including them to its MAC handle table.
Last but not least, a port can go into forwarding method. This enables a port to forward and obtain information frames, send out and get BPDUs, and put MAC addresses in its MAC desk.
To see the STP method of a offered interface, utilize the display spanning-tree interface command.
SW1#demonstrate spanning-tree interface quickly 0/11
Vlan Part Sts Charge Prio.Nbr Form
—————- —- — ——— ——– ———-
VLAN0001 Desg FWD 19 128.11 P2p
To view these states in action, shut a port down as part of your CCNA / CCNP residence lab and frequently run the demonstrate spanning interface command. After you see this in motion on true Cisco products, you’ll don't have any difficulty with BCMSN Test concerns. Just don’t observe this or any other Cisco command http://edition.cnn.com/search/?text=먹튀검증 on the generation community!