Dell Force10 MXL Blade MXL 10/40GbE Switch IO Module Configuration Guide - Page 410

www.dell.com | support.dell.com To change PVST+ parameters, use the following commands on the Root Bridge: Task Change the forward-delay parameter. • Range: 4 to 30 • Default: 15 seconds Change the hello-time parameter. Note: With large configurations (especially those with more ports), Dell Force10 recommends that you increase the hello-time. Range: 1 to 10 Default: 2 seconds Change the max-age parameter. Range: 6 to 40 Default: 20 seconds Command Syntax vlan forward-delay vlan hello-time vlan max-age Command Mode PROTOCOL PVST PROTOCOL PVST PROTOCOL PVST To view the values for the global PVST+ parameters, use the show spanning-tree pvst command (Figure 23-4). Enable BPDU Filtering globally The enabling of BPDU Filtering stops transmitting of BPDUs on the operational port fast enabled ports by default. When BPDUs are received, the spanning tree is automatically prepared. By default global bpdu filtering is disabled. 408 | Per-VLAN Spanning Tree Plus (PVST+)