What is Pvst and Pvst+?

What is Pvst and Pvst+?

Per VLAN Spanning Tree (PVST) is a Cisco proprietary protocol that allows a Cisco device to have multiple spanning trees. PVST+ is an extension of PVST that allows a Cisco device to also interoperate with devices that are running a single spanning tree (IEEE 802.1Q).

What is the Pvst?

Per-VLAN Spanning Tree (PVST) is a Cisco proprietary Spanning Tree Protocol (STP) which operates a separate instance of Spanning Tree Protocol (STP) for each individual VLAN. A separate instance of Spanning Tree Protocol (STP) for each VLAN helps VLAN to be configured independently and also can perform better.

What is the highest Spanning Tree priority?

The default priority is 32768, and additional roots are set below this number. STP increments priority by 4096, so the next priority is 4096 below 32768. The lower the number, the higher the priority.

Is Pvst compatible with STP?

Spanning-Tree Configuration Guidelines If more VLANs are defined than there are spanning-tree instances, you can enable PVST+ or rapid PVST+ on STP ports s in only 128 VLANs on the switch. The remaining VLANs operate with spanning tree disabled.

What is the priority range for RPVST + on VLAN?

The ability to change the Priority provides flexibility for determining which switch on the VLAN will be the root for RPVST+, regardless of its MAC address. The priority range for an RPVST+ switch is 0-61440. However, this command specifies the priority as a multiplier (0 – 15) of 4096.

What is the priority multiplier for RPVST +?

The priority range for an RPVST+ switch is 0-61440. However, this command specifies the priority as a multiplier (0 – 15) of 4096. That is, when you specify a priority multiplier value of 0 – 15, the actual priority assigned to the switch is: (priority-multiplier) x 4096.

What do you need to know about rapid PVST +?

Rapid PVST+ is enabled by default on the default VLAN (VLAN1) and on all newly created VLANs in software. Rapid PVST+ interoperates with switches that run legacy IEEE 802.1D STP. RSTP is an improvement on the original STP standard, 802.1D, which allows faster convergence.

How does rapid PVST + work with IEEE 802.1D?

Rapid PVST+ interoperates with the IEEE 802.1D standard, which mandates a single STP instance for all VLANs, rather than per VLAN. Rapid PVST+ is enabled by default on the default VLAN (VLAN1) and on all newly created VLANs in software. Rapid PVST+ interoperates with switches that run legacy IEEE 802.1D STP.