Dell Force10 S4810P - STP Root Selection

Spanning Tree Protocol (STP) | 1013
Figure 49-4. Enabling BPDU Guard
STP Root Selection
The Spanning Tree Protocol determines the root bridge, but you can assign one bridge a lower priority to
increase the likelihood that it will be selected as the root bridge. You can also specify that a bridge is the
root or the secondary root.
To change the bridge priority or specify that a bridge is the root or secondary root:
FTOS Behavior: BPDU Guard and BPDU filtering (refer to Removing an Interface from the Spanning Tree Group)
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
Hub
S
witch with Spanning Tree Enabled
FTOS(conf-if-gi-3/41)# spanning-tree 0 portfast bpduguard shutdown-on-violati
on
FTOS(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