Chapter 16
Configuring Optional Spanning-Tree Features
When the switch is operating in MST mode, BPDUs are not sent on nonboundary ports only if the
interface is blocked by loop guard in all MST instances. On a boundary port, loop guard blocks the
interface in all MST instances.
Configuring Optional Spanning-Tree Features
These sections describe how to configure optional spanning-tree features:
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Default Optional Spanning-Tree Configuration
Table 16-1 Default Optional Spanning-Tree Configuration
Feature
Port Fast, BPDU filtering, BPDU guard
UplinkFast
BackboneFast
Root guard
Loop guard
Optional Spanning-Tree Configuration Guidelines
The UplinkFast and BackboneFast features are not supported with the rapid PVST+ or the MSTP.
78-15870-01
shows the default optional spanning-tree configuration.
(optional)
(optional)
(optional)
(optional)
(optional)
(optional)
Default Setting
Globally disabled (unless they are individually configured
per interface).
Globally disabled.
Globally disabled.
Disabled on all interfaces.
Disabled on all interfaces.
Catalyst 3750 Metro Switch Software Configuration Guide
Configuring Optional Spanning-Tree Features
(optional)
16-9