STP (Spanning Tree Protocol) Versions

Although CST is obsolete, now Cisco by default uses RSTP+ from amongst the different STP Versions.

3 STP Versions you can use today:

1. To use STP you can only use Cisco-proprietary PVST+ (802.1D) (1STP/VLAN)

2. To use Multiple Spanning Tree you can only use IEEE Standard MSTP (802.1S) (1STP/VLAN)

3. To use RSTP you can only use Cisco-proprietary RPVST+(802.1W) (1STP/VLAN)

4. Rest other versions are Obsolete !!!

Year 1990&1998...

802.1D

1. CST (Common Spanning Tree): !!! OBSOLETE !!!

   • One Spanning Tree for the entire Bridged Network.

2. PVST (Per VLAN Spanning Tree):!!! OBSOLETE !!!

   • One Spanning Tree per VLAN

   • Only supported ISL

3. PVST+ (Per VLAN Spanning Tree Plus):

   • Supports ISL & 802.1Q

Year 2000...

802.1W:

1. RSTP (Rapid Multiple Spanning Tree Protocol): !!! OBSOLETE !!!

   • Faster convergence.

   • One RAPID Spanning Tree for the entire Bridged Network.

     802.1S:

2. MSTP (Multiple Spanning Tree Protocol):

   • Mapping Multiple VLAN on a single Spanning Tree Instance.

Year 2001...

802.1W (2001):

1. RPVST+ (Rapid per VLAN Spanning Tree Plus)

   • One RAPID Spanning Tree per VLAN

     (DEFAULT VERSION ON CISCO SWITCHES)

     (if you have Thousands of Switches then use MSTP)

Reference:

• CCNA 200-301 OCG, Volume 1, Pg. 241-242 - Wendell Odom.

  https://courses.davidbombal.com/courses/267624/lectures/4153133