Filt
Filters and QOS Configuration for Ethernet Routing Switch 5500
Technical Configuration Guide
9. BPDU Filtering
BPDU filtering is a feature that when enabled at a port level, will either shutdown a port for a specific time
period or forever when it receives a Spanning Tree BPDU. For all user access ports, it is recommended to
enable Spanning Tree Fast Start in addition to BPDU filtering. If you select to shut down the port forever,
manual intervention is required to bring the port back up by disabling and then re-enabling the port state.
BPDU filter is enabled at an interface level using the following commands:
5520-1(config-if)# spanning-tree bpdu-filtering timeout <10-65535 seconds or 0
for infinity>
5520-1(config-if)# spanning-tree bpdu-filtering enable
9.1 BPDU Filtering Configuration
Assuming we wish to enable BPDU filtering with the timer set to infinity (set to 0) on access ports 1/1 to
1/10, enter the following commands:
5520-1(config)# interface fastEthernet 1/1-10
5520-1(config-if)# spanning-tree learning fast
5520-1(config-if)# spanning-tree bpdu-filtering timeout 0
5520-1(config-if)# spanning-tree bpdu-filtering enable
5520-1(config-if)# exit
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