Usage Information

Example

VersionDescription

8.2.1.0Introduced the hardware shutdown-on-violation options.

7.6.1.0Introduced on the S-Series.

7.5.1.0Introduced on the C-Series.

7.4.1.0Added the optional bridge port data unit (BPDU) guard.

6.2.1.1Introduced on the E-Series.

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. 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 RPM CPU.

You cannot enable STP root guard and loop guard 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 message displays: % Error: RootGuard is configured. Cannot configure LoopGuard.

Enabling Portfast BPDU guard and loop guard at the same time on a port results in a port that remains in a Blocking state and prevents traffic from flowing through it. For example, when Portfast BPDU guard and loop guard are both configured:

•If a BPDU is received from a remote device, BPDU guard places the port in an Err-Disabled Blocking state and no traffic is forwarded on the port.

•If no BPDU is received from a remote device, loop guard places the port in a Loop-Inconsistent Blocking state and no traffic is forwarded on the port.

Dell(conf)#interface tengigabitethernet 4/1 Dell(conf-if-gi-4/0)#spanning-tree rstp edge-port Dell(conf-if-gi-4/0)#show config

!

interface TenGigabitEthernet 4/1 no ip address

switchport

spanning-tree rstp edge-port no shutdown

Dell#

1358

Rapid Spanning Tree Protocol (RSTP)

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Dell 9.7(0.0) manual Usage Information Example VersionDescription, Introduced the hardware shutdown-on-violation options