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.
Commands in this Chapter
This chapter explains the following commands:
show spanning-tree spanning-tree
Spanning Tree Commands
spanning-tree cost spanning-tree mst