Welcome back, everyone. Now, we've mentioned that it already is kind of old, right? 13 years. So there are that we saw the other types of spanning tree. But let's go into a little bit more detail. Now you have there's three, there's three traditional types of spanning tree.

Yeah, the common STP, which What does it do has creates a single instant recipe that encompasses all VLANs. So the recipe that's already configured on the packet tracer, all right, or that's just the default spanning tree, you can when you're creating, and I want to help myself What will you do when STP comes alive, because you're the redundancy and you're creating VLANs why that's the whole point, you're creating VLANs you better be creating VLANs it only you don't need to create an instance per VLAN you can use that one One spanning tree to cover all VLANs to cover all VLANs the native VLAN or whatever VLAN you send to us, okay, it's not it's okay. It's good administration or the hammers brothers issues that we'll talk about okay. This is also referred to as a common spanning tree Okay, all CSE bpdu are transmitted or the trunk links obviously, right, because the switches are all interconnected together and how they communicate is via bridge protocol data units.

Now, this particular type of spanning tree will reduce switch CPU load and simplify switch configuration. Definitely, right. It's not different instances of spanning tree they got to keep track of just one instance. All right, but it will call issues because it blocks support. Right. So, the blocked out port, maybe you want to load balance off that port or maybe you don't make a mistake at all.

Won't send out VLAN information out of that port. Okay, so that's why you may prefer other VLANs such as per VLAN spanning tree or PVS t, which will allow you to load balance will align to load balance, or you can choose Okay, I'm going to use this instance right, this particular link that's on this VLAN and this particular link that's on this VLAN. And we're going to load balance through those or information through those so you can create different links from different spanning trees that are not blocked, okay? So you don't have an issue. So this will create a multiple SCP instances that would allow for load balancing, one link my Ford on one several VLANs while the all redundant link by for a different set of VLANs. So that's the flexibility and that this particular type of spanning tree brings in PBS T. Okay, it has multiple instances you can create that, but again, remember that we need to say okay, how do we segment you know, our blocks, you know, how many VLANs are we Going to create a how are we going to create them?

How are we going to deploy them? Alright, just just naming them all right, and then assigning it to the proper port then we think okay, we're gonna have redundant links we have to buy we don't want nobody to use you know one wire and everybody's down. We don't want that we want redundancy. So we need to think now Okay, which is spanning tree what spanning tree Am I going to use? Am I going to use just a plain Jane spanning tree, a common spanning tree and then just create one instance of it or am I going to break it down to different ones, so I can send forward or low balance waterways that I want to do okay. Now, the PTSD plus which is per VLAN spanning tree, obviously, you can create instances of spanning tree and it will also port all the instances or spanning tree so you can run in FreeBSD plus, and if you have the APR 20, which is a common spanning tree over into mq or running just A regular old PVC, PVC plus wool, it is backward compatible, it will support that.

So that's not a big issue. And I will go ahead and create all the new stuff that you know that it does. Number one, when a link goes down spanning tree usually takes a little bit of time when that link comes back up to say, okay, who are you? What are you connected to? What port Are you so that process is slow, which is common spanning tree. All right, but with PVS D is much faster and when PVS plus is also a lot faster.

Okay, so that's what you want. When your links go down, you come right back up. And one of the things that we've done in my previous courses, right like the CCNA, okay, it was turning off spanning tree. But we turn off spanning tree on access ports, where your end devices are plugged into. Why because you don't want Spanish Are you taking a look at that and you're waiting, you're waiting you're waiting for yourself? Part Two go to designate a forwarding.

So in order for your horse to quickly go to designated forwarding, you turn on spanning tree on those access ports. Yes, you're going to get a message, beware of somebody plugging in something to a networking device, well, then that's why be you turn on bpdu guard, enable bpdu guard enable, that's the command to look for any bpdu because end devices don't send BPD use. So if somebody plugs in an end device, not an end device internetworking device to one of those ports, they're sending BPD use so all that guard is saying hey, you're a bpdu tell me send me VP to use this spanning trees cut off so it'll turn that port into error disable whether it comes your error correction and awesome Sarah thing ties in. So there's a lot to think about when designing a network. All right, so spanning tree alone, understanding it, there's like oh, my God, okay, but we need to understand that we need to know Stand it and how to implement it.

And why would you want to implement it this way? Okay, see you in the next