I just started a new job and part of it is to manage and maintain the ICT. As the previous network/system engineer left the company i'm on my own to figure out how everything works.
I have experience with basic networking and i know what vlans are but never worked with them. I don't understand how the vlan configuration that i "found" here works. I watched a lot of youtube video's, read some articles on the web and read the manual of the switches but i still have multiple questions about this.
They use (6) LANCOM ES-2126 switches and
Tag-Based vlans. There are
Tag-based groups configured on the switches and some ports are member to multiple vlans. If i understand this well, this means that 1 port receives traffic from multiple vlans? (so this are trunk ports?) Is this correct?
I dont understand why devices like phones and computers are connected to these ports as i understood from my research that trunk ports are meant to link switches and routers so you don't need a wire for each vlan. Is it a good idea to connect devices like phones and computers to these a trunk?? ports?
Another thing i don't understand is that in some
Tag-based VLAN groups the
Untag is applied to some ports. When i understand this function correct, it removes the vlan tag (VID of the concerning
Tag-based vlan group) from the package before it leaves the port? is this correct? and why should the tag be removed?
When a device (e.g.) computer sends information to antoher device, which vlan tag do these packages get? Is this the PVID i configured for the concerning port the devices is connected to? Or does this have also a relation with the Tag-bases groups?
I also read something that tag based vlans are using MAC addresses to add tags to packages but i cant find VID-MAC relations anywhere. Is it possible that this network works without and just bases VID on something else?
Sorry when this are "stupid" questions but i have no idea how to get answers on these questions as no-one knows anything about the network and the old engineer is not available for helping me out.