Dell N3200-ON EMC Networking N-Series Switches CLI Reference Guide version 6.7 - Page 815

port. In this way, the root guard enforces the position of the root bridge. In MSTP scenario the port may be designated in one of the instances while being alternate in the CIST, and so on. Root guard is a per port (not a per port per instance command) configuration so all the MSTP instances this port participates in should not be in root role. STP BPDU Filtering - STP BPDU filtering applies to all operational edge ports. An Edge Port is supposed to be connected to hosts that typically do not generate BPDUs. Ports on which BDPU filtering is enabled will drop both transmitted and received BPDUs. As a result, loops may be formed on ports for which BPDU filtering is enabled. STP BPDU Flooding - STP BPDU flooding feature applies to an STP disabled switch. To enable BPDU flooding on a port, STP must be disabled on the switch administratively. When this feature is enabled on the switch, it floods all the ports which have the BPDU flood feature enabled. BPDU Storm Protection - If STP BPDUs are received at a rate of 15 pps or greater for 3 consecutive seconds on a port, the port will be diagnostically disabled. A message of the following form is logged: MAY 04 09:45:23 10.10.10.10-1 DOT1S[276072720]: dot1s_ih.c(1587) 15855515 %% Diagnostically disabling interface 2/0/41 Use the no shut command to return the port to service. clear spanning-tree detected-protocols Use the clear spanning-tree detected-protocols command to restart the protocol migration process (force the renegotiation with neighboring switches) on all interfaces or on the specified interface. Syntax clear spanning-tree detected-protocols [ interface-id ] • interface-id-An Ethernet or port channel interface identifier Default Configuration This command has no default setting. Command Mode Privileged Exec mode Layer 2 Switching Commands 815