Is there an accepted way to bridge a VLAN across two or more VTP domains?
We have 3 separate factories on a large site each with its own VTP domain, there is one VLAN for contractor internet access that needs to be carried across the whole site into the first datacentre and to the internet routers. Currently we just use a similarly numbered access port on a 6509 core switch in each domain, but this seems like a compromise.
They are all on the same campus, connected by IP. We just have two vlans (for supplier internet access) that we take from one factory into another factory and out towards the internet asonly one of the factories has external internet/WAN access.
If your factories are interconnected by means of layer3 (IP) connectivity (obviously using router or layer3 switch) there is no vlan through the 3 factory sites to carry the inter factory traffic.
If there is IP connectivity indeed between the fact sites you don't have struggle with vlans but you have to configure routing between the sites and towards the Internet using the router used for the Internet gateway router.
Still a diagram would be helpful for better understanding what you have now and what you want to achieve.
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