configure stpd ports edge-safeguard enable

configure {stpd} stpd_name ports edge-safeguard enable port_list {bpdu-restrict} {recovery-timeout {seconds}}

Description

Enables the edge safeguard loop prevention on the specified RSTP or MSTP (Multiple Spanning Tree Protocol) edge port.

Syntax Description

stpd_name Specifies an STPD (Spanning Tree Domain) name on the switch.
port_list Specifies one or more edge ports.
bpdu-restrict Disables port as soon as a BPDU is received.
recovery-timeout Time after which the port will be re-enabled.
seconds Specifies the time in seconds. The range is 60 to 600. The default is 300.

Default

By default, this feature is disabled.

Usage Guidelines

This command applies only to ports that have already been configured as edge ports.

Loop prevention and detection on an edge port configured for RSTP or MSTP is called edge safeguard. You configure edge safeguard on RSTP or MSTP edge ports to prevent accidental or deliberate misconfigurations (loops) resulting from connecting two edge ports together or by connecting a hub or other non-STP (Spanning Tree Protocol) switch to an edge port. Edge safeguard also limits the impact of broadcast storms that might occur on edge ports.

An edge port configured with edge safeguard immediately enters the forwarding state and transmits BPDUs. This advanced loop prevention mechanism improves network resiliency but does not interfere with the rapid convergence of edge ports.

Recovery time starts as soon as the port becomes disabled. If no recovery-timeout is specified, the port is permanently disabled.

BPDU restrict can be disabled using the configure {stpd} stpd_name ports bpdu-restrict [enable | disable]port_list {recovery-timeout {seconds}} command and selecting disable.

If edge safeguard is disabled, BPDU restrict is also disabled.

To view the status of the edge safeguard feature use the show {stpd} stpd_name ports {[detail |port_list {detail}]} command. You can also use the show stpd {stpd_name | detail} command to display the STPD configuration on the switch, including the enable/disable state for edge safeguard.

Note

Note

In MSTP, configuring edge safeguard at CIST will be inherited in all MSTI (Multiple Spanning Tree Instances).

Example

The following command enables edge safeguard on RSTP edge port 4 in STPD s1 on a stand-alone switch:

configure stpd s1 ports edge-safeguard enable 4

History

This command was first available in ExtremeXOS 11.4.

The BPDU Restrict function was added in ExtremeXOS 12.4.

Platform Availability

This command is available on the Summit X450-G2, X460-G2, X670-G2, X770, and ExtremeSwitching X440-G2, X590, X620, X690, X870 series switches.