Hello, I have a network where all of the vlan ip address are on the core (6509) switch and VTP replicates the vlans to other switches connected to the core. What I would like to do is move some vlans onto a lab (4506) switch and break VTP into two domains. Currently, the lab switch is connected as a trunk and has a static route of 0.0.0.0 0.0.0.0 to the core. The interface is configured as a switchport.
1. since the port on the lab to core switch is configured as a switchport it's not routing, correct? So I can change it to "no switchport" and add an ip address to the interface and then configure ospf for dynamic routing.
2. Will this, effectively, create/separate my VTP domain?
3. Do you see any issues with this?
Please find the answer below as per your queries:
1- Switchport indicate that your port configured as L2. With "no switchport" command port become L3 then assign IP address and run routing protocol (static or dynamic) to exchange routes.
2-Via task-1 you not only segregate VTP domain you can also divide your network in multiple routing domain and need to run routing protocol to exchange routes.
3- I don't see any issue. It's total depend on network requirement.
Thanks & Best regards;
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#1 You can route across switch ports that are access or trunk using SVIs. However, as VTP replication needs a trunk, changing the port to a routed port will block the VTP replication.
#2 Yes, although it can also be blocked by the devices on the two sides of a trunk being in different VTP domains (which I would recommend regardless whether you reconfigure the port or not).
#3 Yes, if you don't change your lab's VTP domain, and you're using VTP versions 1 or 2, you're setting yourself up for the classical accidental "zap" of your prod VTP domain. (Even if you do use a different VTP domain for the lab, be very careful in how you add VTP devices to your VTP domains, especially a prod VTP domain. Recommend you read up on the proper/recommended procedure.)
"#3 Yes, if you don't change your lab's VTP domain, and you're using VTP versions 1 or 2, you're setting yourself up for the classical accidental "zap" of your prod VTP domain. (Even if you do use a different VTP domain for the lab, be very careful in how you add VTP devices to your VTP domains, especially a prod VTP domain. Recommend you read up on the proper/recommended procedure.)"
This is exactly what I'm worried about. As long as I make it a layer 3 port VTP won't cross the link and I should be ok, right? I can change the VTP domain on the lab switches later?
VTP is L2 Technology, it will not cross the L3 domain. If you configure the port b/w Production & Lab as L3 then you need to do routing b/w both network.
Thanks & Best regards;