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1151

Table Of Contents

Parameters

stp-id

Enter the STP instance ID. The range is 0.

cost

Enter the keyword cost then a number as the cost. The range is 1 to 65535. The

defaults are:

● 10-Gigabit Ethernet interface = 2.

● Port Channel interface with 10-Gigabit Ethernet = 1.

rootguard Enter the keyword rootguard to enable STP root guard on a port or port-channel

interface.

portfast

[bpduguard

[shutdown-on-

viol ation] |

bpdufilter]

Enter the keyword portfast to enable Portfast to move the interface into

Forwarding mode immediately after the root fails.

Enter the optional keyword bpduguard to disable the port when it receives a

BPDU.

Enter the optional keywords shutdown-on-violation to hardware disable an

interface when a BPDU is received and the port is disabled.

Enter the keyword bpdufilter to enable on an interface; it should stop sending

and receiving BPDUs on the port fast enabled ports.

priority

Enter keyword priority then a number as the priority. The range is zero (0) to

15. The default is 8.

Defaults cost = depends on the interface type; priority = 8

Command Modes INTERFACE

Supported Modes Full–Switch Mode

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

If you enable portfast bpduguard on an interface and the interface receives a BPDU, the software

disables the interface and sends a message stating that fact. The port is in ERR_DISABLE mode,

yet appears in the show interface commands as enabled. If you do not enable shutdown-on-

violation, BPDUs still are sent to the RPM CPU.

STP root guard is supported on a port or port-channel enabled in any Spanning Tree mode: Spanning

Tree Protocol (STP), Rapid Spanning Tree Protocol (RSTP), Multiple Spanning Tree Protocol (MSTP),

and Per-VLAN Spanning Tree Plus (PVST+).

Root guard is supported on any STP-enabled port or port-channel except when used as a stacking port.

When enabled on a port, root guard applies to all VLANs configured on the port.

Spanning Tree Protocol (STP) 1155