Dell S3100 Command Line Reference Guide for the Series 9.100.0 - Page 1058

Example 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-if-gi-1/1)# spanning-tree pvst vlan 3 cost 18000 Dell(conf-if-gi-1/1)# end Dell(conf-if-gi-1/1)# show config ! interface GigabitEthernet 1/1 no ip address switchport spanning-tree pvst vlan 3 cost 18000 no shutdown Dell(conf-if-gi-1/1)#end Dell# Related Commands • show spanning-tree pvst - views the PVST+ configuration. spanning-tree pvst err-disable Place ports in an Err-Disabled state if they receive a PVST+ BPDU when they are members an untagged VLAN. Syntax spanning-tree pvst err-disable cause invalid-pvst-bpdu Defaults Enabled; ports are placed in the Err-Disabled state if they receive a PVST+ BPDU when they are members of an untagged VLAN. Command Modes INTERFACE Command History This guide is platform-specific. For command information about other platforms, see the relevant Dell Networking OS Command Line Reference Guide. Version Description 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 8.3.7.0 8.2.1.0 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. Introduced on the S4810. Introduced. Usage Information Some non-Dell Networking systems which have hybrid ports participating in PVST+ transmit two kinds of BPDUs: an 802.1D BPDU and an untagged PVST+ BPDU. Dell Networking systems do not expect PVST+ BPDU on an untagged port. If this happens, Dell Networking OS places the port in the Error-Disable state. This behavior might result in the network not converging. To prevent 1058 Per-VLAN Spanning Tree Plus (PVST+)