Reference Guide

• 40-Gigabit Ethernet interface = 2000
• Port Channel interface with one 1-Gigabit Ethernet =
20000
• Port Channel interface with one 10-Gigabit Ethernet =
2000
• Port Channel interface with one 40-Gigabit Ethernet =
2000
• Port Channel with two 1-Gigabit Ethernet = 18000
• Port Channel with two 10-Gigabit Ethernet = 1800
• Port Channel with two 40-Gigabit Ethernet = 1800
edge-port Enter the keywords edge-port to configure the interface as
a rapid 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.
priority priority Enter keyword priority followed by a value in increments
of 16 as the priority. The range is 0 to 240. The default is
128.
loopguard Enter the keyword loopguard to enable loop guard on an
RSTP port or port-channel interface.
rootguard Enter the keyword rootguard to enable root guard on an
RSTP port or port-channel interface.
Defaults Not configured.
Command
Modes
INTERFACE
Command
History
Version 9.0(1.3) Introduced on the S5000.
Usage
Information
The BPDU guard option prevents the port from participating in an active STP
topology in case a BPDU appears on a port unintentionally, or is misconfigured, or
is subject to a DOS attack. This option places the port into an Error Disable state if a
BPDU appears and a message is logged so that the administrator can take
corrective action.
NOTE: A port configured as an edge port, on an RSTP switch, immediately
transitions to the Forwarding state. You should only configure ports
connected to end-hosts as edge ports. Consider an edge port similar to a port
with a spanning-tree portfast enabled.
If you do not enable shutdown-on-violation, BPDUs are still sent to the stack-
unit CPU.
Rapid Spanning Tree Protocol (RSTP)
1191