CLI Guide

spanning-tree mstp
Configures a Layer 2 MSTP interface as an edge port with (optionally) a bridge protocol data unit (BPDU)
guard, or enables the root guard or loop guard feature on the interface.
Syntax
spanning-tree mstp {edge-port [bpduguard [shutdown-on-
violation]] | bpdufilter| rootguard}
Parameters
edge-port Enter the keywords edge-port to configure the interface
as a multiple spanning tree edge port.
bpduguard (OPTIONAL) Enter the keyword portfast to enable
Portfast to move the interface into forwarding mode
immediately after the root fails.
Enter the keyword bpduguard to disable the port when it
receives a BPDU.
bpdufilter (OPTIONAL) Enter the keyword edgeport to enable edge
port configuration to move the interface into forwarding
mode immediately after the root fails. Enter the keyword
bpdufilter to stop sending and receiving BPDUs on the
port-fast enabled ports.
shutdown-on-
violation
(OPTIONAL) Enter the keywords shutdown-on-violation
to hardware disable an interface when a BPDU is received
and the port is disabled.
rootguard Enter the keyword rootguard to enable root guard on an
MSTP port or port-channel interface.
Command Modes INTERFACE
Supported Modes Full–Switch
Command History
Version Description
9.9(0.0) Introduced on the FN IOM.
8.3.16.1 Introduced on the MXL 10/40GbE Switch IO Module.
Usage Information
On an MSTP switch, a port configured as an edge port immediately transitions to
the forwarding state. Only ports connected to end-hosts should be configured as
an edge port. Consider an edge port similar to a port with spanning-tree
portfast enabled.
Root guard and loop guard cannot be enabled at the same time on a port. For
example, if you configure loop guard on a port on which root guard is already
configured, the following error message is displayed: % Error: RootGuard is
configured. Cannot configure LoopGuard
.
When used in an MSTP network, if root guard blocks a boundary port in the CIST,
the port is also blocked in all other MST instances.
Multiple Spanning Tree Protocol (MSTP)
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