Cisco CCNP / BCMSN Exam Tutorial: The 4 (Or 5) STP Port States
Being a CCNP prospect in addition to a CCNA, you may be tempted to skip or perhaps browse the many details of Spanning Tree Protocol. In spite of everything, you realized all of that within your CCNA http://www.bbc.co.uk/search?q=먹튀검증 reports, correct? That’s right, however it never hurts to review STP for your switching Examination! Apart from, Many people visualize the four STP port states – but officially, there’s a fifth 1!
Disabled isn’t usually considered an STP port condition, but Cisco does officially contemplate this to generally be an STP state. A disabled port is one which is administratively shut down.
Once the port is opened, the port will go into blocking point out. Because the name indicates, the port can’t do Significantly Within this condition – no frame forwarding, no body obtaining, and so no Understanding of MAC addresses. About The one thing this port can perform is acknowledge BPDUs from neighboring switches.
A port will then go from blocking manner into listening method. The obvious concern is “listening for what?” Listening for BPDUs – and this port can now deliver BPDUs at the same time. The port nevertheless can’t ahead or acquire data frames.
When the port goes from listening manner 먹튀검증 to Discovering method, it’s on the point of send and acquire frames. In learning method, the port commences to master MAC addresses in planning for including them to its MAC deal with table.
Lastly, a port can go into forwarding mode. This permits a port to forward and acquire knowledge frames, deliver and acquire BPDUs, and area MAC addresses in its MAC desk.
To begin to see the STP manner of a supplied interface, use the clearly show spanning-tree interface command.
SW1#demonstrate spanning-tree interface rapid 0/11
Vlan Job Sts Value Prio.Nbr Variety
—————- —- — ——— ——– ———-
VLAN0001 Desg FWD 19 128.11 P2p
To determine these states in action, shut a port down with your CCNA / CCNP household lab and regularly operate the exhibit spanning interface command. Once you see this in motion on genuine Cisco gear, you’ll have no issue with BCMSN Examination inquiries. Just don’t observe this or some other Cisco command with a production network!