Pvst+ Sample Configurations - Dell C9000 Series Networking Configuration Manual

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To keep both ports in a Forwarding state, use extend system ID. Extend system ID augments the bridge ID

with a VLAN ID to differentiate BPDUs on each VLAN so that PVST+ does not detect a loop and both ports

can remain in a Forwarding state.

Figure 103. PVST+ with Extend System ID

Augment the bridge ID with the VLAN ID.

PROTOCOL PVST mode

extend system-id

Example of Viewing the Extend System ID in a PVST+ Configuration

Dell(conf-pvst)#do show spanning-tree pvst vlan 5 brief

Executing IEEE compatible Spanning Tree Protocol

Root ID Priority 32773, Address 0001.e832.73f7

Root Bridge hello time 2, max age 20, forward delay 15

Bridge ID Priority 32773 (priority 32768 sys-id-ext 5), Address 0001.e832.73f7

We are the root of Vlan 5

Configured hello time 2, max age 20, forward delay 15

PVST+ Sample Configurations

The following examples provide the running configurations for the topology shown in the previous

illustration.

Example of PVST+ Configuration (R1)

interface TengigabitEthernet 1/22

no ip address

Per-VLAN Spanning Tree Plus (PVST+)