vlan
vlan-range
Enter the keyword vlan followed by the VLAN number(s). The range
is 1 to 4094.
cost
number
Enter the keyword cost followed by the port cost value. The range is
1 to 200000.
Defaults:
• 100 Mb/s Ethernet interface = 200000.
• 1-Gigabit Ethernet interface = 20000.
• 10-Gigabit Ethernet interface = 2000.
• Port Channel interface with one 100 Mb/s Ethernet = 200000.
• Port Channel interface with one 1-Gigabit Ethernet = 20000.
• Port Channel interface with one 10-Gigabit Ethernet = 2000.
• Port Channel with two 1-Gigabit Ethernet = 18000.
• Port Channel with two 10-Gigabit Ethernet = 1800.
• Port Channel with two 100-Mbps Ethernet = 180000.
priority
value
Enter the keyword priority followed the Port priority value in
increments of 16. The range is 0 to 240. The default is
128.
loopguard (C-, S-, and E-Series TeraScale only) Enter the keyword loopguard
to enable loop guard on a PVST+ port or port-channel interface.
rootguard (C-, S-, and E-Series TeraScale only) Enter the keyword rootguard
to enable root guard on a PVST+ port or port-channel interface.
Defaults Not configured.
Command Modes INTERFACE
Command History
Version 8.3.11.1 Introduced on the Z9000.
Version 8.4.2.1 Introduced the loopguard and rootguard options on the E-
Series TeraScale, C-Series, and S-Series.
Version 8.3.7.0 Introduced on the S4810.
Version 8.2.1.0 Introduced the hardware shutdown-on-violation option.
Version 7.6.1.0 Introduced on the S-Series.
Version 7.5.1.0 Introduced on the C-Series.
Version 7.4.1.0 Added the optional Bridge Port Data Unit (BPDU) guard.
Version 6.2.1.1 Introduced.
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 the Error Disable state if a BPDU appears, and a message is
logged so that the administrator can take corrective action.
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