Dell Force10 MXL Blade MXL 10/40GbE Switch IO Module Configuration Guide - Page 409

Display the PVST+ forwarding topology by entering the show spanning-tree pvst [vlan vlan-id] command from EXEC Privilege mode (Figure 23-4). Figure 23-4. Display the PVST+ Forwarding Topology FTOS(conf-if-te-5/41)#do show spanning-tree pvst vlan 2 VLAN 2 Root Identifier has priority 32768, Address 001e.c9f1.00f3 Root Bridge hello time 2, max age 20, forward delay 15 Bridge Identifier has priority 32768, Address 001e.c9f1.00f3 Configured hello time 2, max age 20, forward delay 15 Bpdu filter disabled globally We are the root of VLAN 2 Current root has priority 32768, Address 001e.c9f1.00f3 Number of topology changes 2, last change occured 00:14:39 ago on Po 23 Port 24 (Port-channel 23) is designated Forwarding Port path cost 1600, Port priority 128, Port Identifier 128.24 Designated root has priority 32768, address 001e.c9f1.00:f3 Designated bridge has priority 32768, address 001e.c9f1.00:f3 Designated port id is 128.24 , designated path cost 0 Number of transitions to forwarding state 1 BPDU sent 449, received 0 The port is not in the Edge port mode, bpdu filter is disabled Port 450 (TenGigabitEthernet 5/41) is disabled Discarding Port path cost 2000, Port priority 128, Port Identifier 128.450 Designated root has priority 32768, address 001e.c9f1.00:f3 Designated bridge has priority 32768, address 001e.c9f1.00:f3 Designated port id is 128.450 , designated path cost 0 Number of transitions to forwarding state 0 BPDU sent 0, received 0 The port is not in the Edge port mode, bpdu filter is disabled Port 459 (TenGigabitEthernet 5/50) is designated Forwarding Port path cost 2000, Port priority 128, Port Identifier 128.459 Designated root has priority 32768, address 001e.c9f1.00:f3 Designated bridge has priority 32768, address 001e.c9f1.00:f3 Designated port id is 128.459 , designated path cost 0 Number of transitions to forwarding state 1 BPDU sent 457, received 0 The port is not in the Edge port mode, bpdu filter is disabled Modify Global PVST+ Parameters The root bridge sets the values for forward-delay and hello-time and overwrites the values set on other PVST+ bridges. • Forward-delay is the amount of time an interface waits in the Listening State and the Learning State before it transitions to the Forwarding State. • Hello-time is the time interval in which the bridge sends bridge protocol data units (BPDUs). • Max-age is the length of time the bridge maintains configuration information before it refreshes that information by recomputing the PVST+ topology. Per-VLAN Spanning Tree Plus (PVST+) | 407