#RootGuard#PacketTracer#Cisco
Root guard does not allow the port to become an STP root port, so the port is always STP-designated. If a better BPDU arrives on this port, the root guard does not take the BPDU into account and elect a new STP root. Instead, the root guard puts the port into the root-inconsistent STP state which is equal to a listening state. No traffic is forwarded across this port.
Notice that Root Guard is always configured on designated ports.
%SPANTREE-2-ROOTGUARDBLOCK: Port 0/1 tried to become non-designated in VLAN 1.
Moved to root-inconsistent state
Download the file in my blog
https://networkforlearners.blogspot.com/