Dell S3100 EMC Command Line Reference Guide for the Series 9.14.2.2 - Page 1533

Command Modes Command History INTERFACE This guide is platform-specific. For command information about other platforms, see the relevant Dell EMC Networking OS Command Line Reference Guide. Version 9.10(0.1) 9.10(0.0) 9.10(0.0) 9.8(2.0) 9.8(1.0) 9.8(0.0P5) 9.8(0.0P2) 9.7(0.0) 9.2(1.0) 9.0.2.0 8.3.19.0 8.3.11.1 8.4.2.1 8.3.7.0 8.2.1.0 7.6.1.0 7.5.1.0 7.4.1.0 6.2.1.1 Description Introduced on the S6010-ON and S4048T-ON. Introduced on the S3148. Introduced on the S6100-ON. Introduced on the S3100 series. Introduced on the Z9100-ON. Introduced on the S4048-ON. Introduced on the S3048-ON. Introduced on the S6000-ON. Introduced on the Z9500. Introduced on the S6000. Introduced on the S4820T. Introduced on the Z9000. Added support for the optional guard keyword on the C-Series, S-Series, and E-Series. Introduced on the S4810. Introduced the hardware shutdown-on-violation options. Introduced on the S-Series. Introduced on the C-Series. Added the optional bridge port data unit (BPDU) guard. Introduced on the E-Series. 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 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. Rapid Spanning Tree Protocol (RSTP) 1533