Dell Force10 S55T S55 Configuration Guide FTOS 8.3.5.3 - Page 712

www.dell.com | support.dell.com FTOS Behavior: Regarding bpduguard shutdown-on-violation behavior: 1 If the interface to be shutdown is a port channel then all the member ports are disabled in the hardware. 2 When a physical port is added to a port channel already in error disable state, the new member port will also be disabled in the hardware. 3 When a physical port is removed from a port channel in error disable state, the error disabled state is cleared on this physical port (the physical port will be enabled in the hardware). 4 The reset linecard command does not clear the error disabled state of the port or the hardware disabled state. The interface continues to be disables in the hardware. The error disabled state can be cleared with any of the following methods: •Perform an shutdown command on the interface. •Disable the shutdown-on-violation command on the interface ( no spanning-tree stp-id portfast [bpduguard | [shutdown-on-violation]] ). •Disable spanning tree on the interface (no spanning-tree in INTERFACE mode). •Disabling global spanning tree (no spanning-tree in CONFIGURATION mode). Figure 39-8. Enabling BPDU Guard Force10(conf-if-gi-3/41)# spanning-tree 0 portfast bpduguard shutdown-on-violation Force10(conf-if-gi-3/41)#show config ! interface GigabitEthernet 3/41 no ip address switchport spanning-tree 0 portfast bpduguard shutdown-on-violation no shutdown 3/41 Hub Switch with Spanning Tree Enabled FTOS Behavior: BPDU Guard and BPDU filtering (see Removing an Interface from the Spanning Tree Group on page 707) both block BPDUs, but are two separate features. BPDU Guard: • is used on edgeports and blocks all traffic on edgeport if it receives a BPDU • drops the BPDU after it reaches the RPM and generates a console message BPDU Filtering: • disables Spanning Tree on an interface • drops all BPDUs at the line card without generating a console message 712 | Spanning Tree Protocol