Nortel Networks 5520, 5530, 5510 manual Bpdu Filtering Configuration

Filters and QoS Configuration for ERS 5500
Technical Configuration Guide	v2.0	NN48500-559

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

9.1BPDU 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

___________________________________________________________________________________________________________________________

Nortel Confidential Information Copyright © 2008 Nortel Networks. All Rights Reserved.
External Distribution	32