Command Line Reference Guide

Defaults
• cost = depends on the interface type
• priority = 128
Command Modes INTERFACE
Command History
Version 9.0(1.3) Introduced on the S5000.
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.
S5000
Syntax
spanning-tree mstp {edge-port [bpduguard [shutdown-on-
violation]] | loopguard | 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.
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.
loopguard Enter the keyword loopguard to enable STP loop guard on an
MSTP port or port-channel interface.
rootguard Enter the keyword rootguard to enable root guard on an MSTP
port or port-channel interface.
Command Modes INTERFACE
Command History
Version 9.0(1.3) Introduced on the S5000.
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.
If you do not enable shutdown-on-violation, BPDUs are still sent to the stack-unit CPU.
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
874