Cisco CCNP / BCMSN Test Tutorial: The Four (Or 5) STP Port States
Like a CCNP applicant and a CCNA, you may well be tempted to skip or just look through the various aspects of Spanning Tree http://edition.cnn.com/search/?text=먹튀검증 Protocol. In any case, you realized all of that in the CCNA studies, proper? That’s right, but it surely hardly ever hurts to critique STP for just a switching exam! Moreover, many of us consider the four STP port states – but formally, there’s a fifth one particular!
Disabled isn’t commonly considered an STP port point out, but Cisco does formally think about this to be an STP state. A disabled port is one which is administratively shut down.
As soon as the port is opened, the port will go into blocking condition. Since the name indicates, the port can’t do Considerably Within this state – no frame forwarding, no frame receiving, and as a consequence no learning of MAC addresses. About the only thing this port can perform is take BPDUs from neighboring switches.
A port will then go from blocking mode into listening manner. The obvious dilemma is “listening for what?” Listening for BPDUs – which port can now ship BPDUs in addition. The port nevertheless can’t forward or receive information frames.
When the port goes from listening mode to learning mode, it’s on the point of send out and obtain frames. In Finding out method, the 먹튀검증 port begins to know MAC addresses in preparing for including them to its MAC handle table.
At last, a port can go into forwarding mode. This permits a port to ahead and get info frames, mail and obtain BPDUs, and area MAC addresses in its MAC table.
To begin to see the STP mode of a offered interface, make use of the clearly show spanning-tree interface command.
SW1#exhibit spanning-tree interface rapid 0/11
Vlan Role Sts Price Prio.Nbr Kind
—————- —- — ——— ——– ———-
VLAN0001 Desg FWD 19 128.11 P2p
To check out these states in action, shut a port down as part of your CCNA / CCNP household lab and regularly run the display spanning interface command. Once you see this in motion on real Cisco gear, you’ll don't have any challenge with BCMSN Examination issues. Just don’t follow this or another Cisco command on a generation community!