root port vs designated port

It's probably easy to configure a switch to be a root switch. However, I've just realized that I missed something that I didn't understand the concept of what the root switch is.

There are two type of port, i.e.:

1. root port
2. designated port

Root port is a port telling us the path toward the root switch. While designated port is a port in direction of leaving away from the root switch.

By that definition, a root port will always a pair with designated port on its direct neighbor switch. And when a switch doesn't have any root port, it is definitely the root switch itself.

Day #1 - root bridge and VLAN path

It's about the time to start again the CCIE journey that I've skipped for quite a while. Unfortunately I have to start everything again from zero. The good news, I think that I can start quicker at this time. I used to spend more time on GNS3, but at this time this is not an issue anymore.

Well, today I've started with some bridging configuration. And I decided to write all notes here to help me remembering the lesson

Q: How to configure a switch to be root bridge
A: Here are some items that I noticed

• configure at the global configuration
• command is spanning-tree vlan XXX root primary

Q: how to prevent VLAN traverse to a switch?
A: Here are the noted points

• by restricting the VLAN on the interface level
• use switchport command

Enough for today. Will continue tomorrow.