Dell PowerConnect 8100 CLI Reference Guide - Page 732
Commands in this floods all the ports which have the BPDU flood feature enabled.
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Page 732 highlights
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. Edge Port in an operational state is supposed to be connected to hosts that typically drop BPDUs. If an operational edge port receives a BPDU, it immediately loses its operational status. In that case, if BPDU filtering is enabled on this port then it drops the BPDUs received on this port. STP BPDU Flooding - STP BPDU flooding feature applies to the STP disabled switch. To enable BPDU flooding on a port, STP should 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. Commands in this Chapter This chapter explains the following commands: clear spanning-tree spanning-tree auto- spanning-tree max- spanning-tree portfast detected-protocols portfast age bpdufilter default exit (mst) spanning-tree bpdu spanning-tree max- spanning-tree portfast flooding hops default instance (mst) spanning-tree spanning-tree mode spanning-tree port- bpdu-protection priority name (mst) spanning-tree cost spanning-tree mst spanning-tree priority configuration 732 Spanning Tree Commands
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