Overview of RPVST+
For information on configuring basic and multiple instance spanning tree, see Multiple instance spanning tree operation.
Platform |
Maximum Allowed RPVST Enabled VLANs |
Recommended Maximum Virtual Ports |
Maximum Allowed Virtual Ports (x is the number of logical ports in the system) |
---|---|---|---|
2540 |
32 |
400 |
2000 + x |
Where x is the sum of all physical ports and logical interface, such as Trk1 if configured.
The following shows how x is calculated using the 2920 switch as an example, you can substitute the actual values for your switch as shown in the table to do a similar calculation. In a stack of 4 with 2x2920-24 and 1 trunk interface Trk1 configured, x will be 24+24+1=49. Therefore the maximum allowed vPorts is 299.
Switch# show spanning-tree system-limits rapid-pvst Spanning Tree Information STP Enabled : No Mode : MSTP RPVST Enabled VLANs : 1,4,20-23 Switch MAC Address : 40a8f0-0df69e Count of RPVST Enabled GVRP VLANs : 0 Count of RPVST Enabled VLANs : 6 Maximum Allowed RPVST Enabled VLANs : 64 Count Of Total Virtual Ports : 51 Maximum Allowed Virtual Ports : 299 Current Operational Recommended Maximum Ports Virtual Ports Virtual Ports Virtual Ports -------------------- --------------- --------------- -------------------- Member 1/1-24 31 27 250 Member 2/1-24 31 24 250