Saturday, 11 February 2017

STP-ROOT GUARD

Root Guard
Root Guard prevents an unauthorised switch from advertising itself as a Root Bridge.

If a BPDU superior to the Root Bridge is received on a port with Root Guard enabled, the port is placed in a root-inconsistent state.

In this state, the port is essentially in a blocking state, and will not forward frames. The port can still listen for BPDUs.

Root Guard is enabled on a per-port basis, and is disabled by default:

Switch(config)# interface gi1/14
Switch(config-if)# spanning-tree guard root

Root Guard can automatically recover. As soon as superior BPDUs are no longer received, the port will transition normally through STP states.

For detailed explanation refer to the below links:


Refer to the Below videos with a nice explanation with example. 




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