DELL PC7024 User Manual

Spanning Tree Commands

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 with the BPDU flood feature enabled on it.

This chapter explains the following commands:

spanning-tree cost spanning-tree mst 

show spanning-tree spanning-tree 

2CSPC4.XCT-SWUM2XX1.book  Page 730  Monday, October 3, 2011  11:05 AM