Reference Guide

Field Description
Sts Port state: root-inconsistent (INCON Root), forwarding (FWD),
listening (LIS), blocking (BLK), or shut down (EDS Shut).
Guard Type Type of STP guard configured (Root, Loop, or BPDU guard).
Example (Guard)
FTOS#show spanning-tree 0 guard
Interface
Name Instance Sts Guard type
--------- -------- --------- ----------
Gi 0/1 0 INCON(Root) Rootguard
Gi 0/2 0 LIS Loopguard
Gi 0/3 0 EDS (Shut) Bpduguard
spanning-tree
Assigns a Layer 2 interface to STP instance 0 and configures a port cost or port priority, or enables loop guard, root
guard, or the Portfast feature on the interface.
C-Series, E-Series, S-Series, Z-Series, S4810
Syntax
spanning-tree stp-id {cost cost | {loopguard | rootguard} |
portfast [bpduguard [shutdown-on-violation]] | priority
priority}
To disable Spanning Tree group on an interface, use the no spanning-tree stp-id
{cost cost | {loopguard | rootguard} | portfast [bpduguard
[shutdown-on-violation]] | priority priority} command.
Parameters
stp-id Enter the STP instance ID. The range is 0.
cost cost Enter the keyword cost followed by a number as the cost. The range
is 1 to 65535. The defaults are:
• 100 Mb/s Ethernet interface = 19.
• 1-Gigabit Ethernet interface = 4.
• 10-Gigabit Ethernet interface = 2.
• Port Channel interface with 100 Mb/s Ethernet = 18.
• Port Channel interface with 1-Gigabit Ethernet = 3.
• Port Channel interface with 10-Gigabit Ethernet = 1.
loopguard (C-, S-, and E-Series TeraScale and S4810 only) Enter the keyword
loopguard to enable STP loop guard on a port or port-channel
interface.
rootguard (C-, S-, and E-Series TeraScale and S4810 only) Enter the keyword
rootguard to enable STP root guard on a port or port-channel
interface.
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