So here's a quick comparison of the different versions of Spending Tree.
The spending tree A to one DX protocol doesn't need a lot of resources but is slow to converge.
You only have one spanning tree instance for your entire layer to network.
This can lead to suboptimal traffic flows and ADA 2 to 1 DX is generally not used today in Cisco environments.
Just be aware that when you use newer versions of spanning tree Cisco switches or backward compatible
and can talk to older switches or non Cisco switches using edited edit2 one DX PVS DT is the Cisco enhancement
that provides a single instance of spending tree per VLAN.
It's just a proprietary.
It needs more resources because one spanning tree instance is created per VLAN.
It is still slow to converge but does allow you to split traffic flows because you have one spanning
tree instance per VLAN.
As an example VLAN one traffic could use one uplink, but VLAN two traffic could use a separate uplink
or a separate port in a network.
Cisco have also enhanced PVS.
RT with features such as Port Fast UpLink, Fast Backbone, Fast BPU, Guard, BPD, Filter, Root,
guard and Loop Guard.
We'll discuss some of those terms in this course.
Otherwise, you'll learn more about those when you attend your camp.
Course's rapids spanning tree protocol or ADA 2 to 1 W is an industry standard protocol.
It doesn't need as many resources as PVS plus because it supports a single instance of spanning tree
for your layer two network.
Its big advantage is that it provides very quick or fast convergence.
It also doesn't address suboptimal traffic flow issues because you can't send VLAN ten traffic for example
down one link and VLAN 20 traffic down another link.
That's the advantage of rapid PvP plus.
Rapid PvP plus incorporates the advantages of rapid spanning tree, but allows you to create one spanning
tree instance per VLAN so you can do load sharing of traffic.
It provides a very quick convergence but uses a lot of resources, especially when you've got many VLANs.
The advantage of multiple spanning tree is that it solves the high resource issue of PVP plus multiple
spending.
Tree allows you to create a instance of spanning tree and then map various VLANs to that instance.
As an example, once again, if you had 200 VLANs, PvP or rapid PvP would require 200 instances of
spanning tree, whereas multiple spanning tree could use two instances to do load sharing and reduce
the amount of resources required.
So CPU and memory requirements for multiple spanning tree are lower than those for rapid PVP plus,
but resources are higher than those for rapid spanning tree.
Now you may find reference materials stating that PvP plus is the default spanning tree on Cisco switches.
That really depends.
A lot of switches today.
Use rapid PvP as the default version of spanning tree.