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Each VLAN on the switches implements address learning, forwarding, and filtering decisions and loop-avoidance mechanisms, just as though the VLAN were a separate physical switch. Ports in different VLANs do not share broadcasts, as illustrated in Figure 3-2, where a PC 3 and PC 4 cannot ping because they are in different VLANs, whereas PC 1 and PC 2 can ping each other because they are part of the same VLAN.
Containing broadcasts within a VLAN improves the overall performance of the network.
As shown in Figure 3-1, sales, human resources, and engineering are three different VLANs spread across all three floors.
The Cisco Catalyst switch implements VLANs by only forwarding traffic to destination ports that are in the same VLAN as the originating ports.
Just like the VLAN feature, we require a primary server that will create the MST configuration.
You can use the same switch for this role or you can pick another one.
Here are some of the new additions to VTP version 3: I’ll walk you through each of those and show you how to configure VTP version 3.
To synchronize MST information we have to use the “MST” feature.
As you can see the VTP mode for this feature is currently transparent.
Because a VLAN is a single broadcast domain, campus design best practices recommend mapping a VLAN generally to one IP subnet.
To communicate between VLANs, packets need to pass through a router or Layer 3 device.
Let’s see if we are able to synchronize some VLANs.