C
HAPTER
16
| STP Commands
– 412 –
stp port
restrictedtcn
This command displays or sets the MSTP port restricted TCN.
SYNTAX
stp port restrictedtcn [port-list] [enable | disable]
port-list - A specific port or a range of ports. (Range: 1-28, or all)
enable - Enables MSTP port restricted TCN.
disable - Disables MSTP port restricted TCN.
DEFAULT SETTING
Disabled
COMMAND USAGE
◆ If this feature enabled, this causes the port not to propagate received
topology change notifications and topology changes to other ports. TCN
messages can cause temporary loss of connectivity after changes in a
spanning tree’s active topology as a result of persistent incorrectly
learned station location information.
◆ TCN messages can be restricted by a network administrator to prevent
bridges external to a core region of the network from causing address
flushing in that region, possibly because those bridges are not under
the full control of the administrator or the physical link state for the
attached LANs transitions frequently.
EXAMPLE
STP>port restrictedtcn 19 enable
STP>
stp port bpduguard This command displays or sets the BPDU guard for specified ports.
SYNTAX
stp port bpduguard [port-list] [enable | disable]
port-list - A specific port or range of ports. (Range: 1-28, or all)
enable - Enables BPDU guard for edge ports, shutting down an
edge port if it receives a BPDU.
disable - Disables BPDU guard for edge ports.
DEFAULT SETTING
Disabled
COMMAND USAGE
◆ This feature protects ports from receiving BPDUs. It can prevents loops
by shutting down an port when a BPDU is received instead of putting it
into the spanning tree discarding state. The BPDU guard feature
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