Contents
Can a VLAN be a root bridge?
To configure a Switch to become the Spanning Tree Protocol (STP) Root Bridge (Root Switch) for a VLAN, you can use the “spanning-tree vlan root” command from the Global Configuration Mode.
What is a bridged VLAN?
Inter-VLAN bridging is the concept of simultaneously bridging multiple VLANs together. Inter-VLAN bridging is occasionally needed in order to bridge non-routable protocols or unsupported routed protocols between multiple VLANs.
What is a root bridge?
The Root bridge (switch) is a special bridge at the top of the Spanning Tree (inverted tree). The branches (Ethernet connections) are then branched out from the root switch, connecting to other switches in the Local Area Network (LAN). All Bridges (Switches) are assigned a numerical value called bridge priority.
Why do we need root bridge?
Redundant links are used to provide back up path when one link goes down but Redundant link can sometime cause switching loops. The main purpose of Spanning Tree Protocol (STP) is to ensure that you do not create loops when you have redundant paths in your network.
How to change the root bridge in VLAN?
We can change the root bridge for each VLAN with the spanning-tree command. Here are our options: priority: We can manually change the bridge priority. root: We can configure the switch as root. What’s the difference between these two parameters? Let’s find out. The spanning-tree vlan command also accepts ranges of VLANs.
How does root bridge work in Cisco IOS?
What happens is that behind the scenes, Cisco IOS sets a priority when you use the root primary or root secondary parameters. We can verify this by looking at our configuration: The way this works is that the switch looks at the priority of the current root bridge and then decreases its own priority so that it becomes the new root bridge.
How does a root bridge change its priority?
We can verify this by looking at our configuration: The way this works is that the switch looks at the priority of the current root bridge and then decreases its own priority so that it becomes the new root bridge. By setting the priority to 0, I’ll have the lowest possible priority.
How to change the root bridge in spanning-tree?
We can change the root bridge for each VLAN with the spanning-tree command. Here are our options: priority: We can manually change the bridge priority. root: We can configure the switch as root. What’s the difference between these two parameters?