If you have a 24 port switch and divide the first 12 ports into VLAN A and the second 12 ports into VLAN B and you just keep it this simple then the only way the first twelve ports can talk to the second twelve ports is to have a port on each VLAN plugged into its own separate interface on the router.
The only way a workstation on VLAN A can ping a workstation on VLAN B is to get its packets routed.
Now if you have that same 24 port switch and you have a router that has a fastethernet ports (Cisco2621 maybe) then you can use ISL or 802.1q encapsulation on the switches and router and you can configure subinterfaces on the router for each VLAN and configure a single port on the switch as the trunkport and now you only need one connection to the router. The packet in this case still needs the router to get back to the other VLAN. The trunking command on the switch will allow multiple VLANs to pass traffic over a single connection to the router.
How would you do that if you had a 2621 router with Fe0/0 used the incoming/outgoing internet access connected to ISP and Fe 0/1 for the internal network, with a local director and 25 ip's? Would a vlan be good here for a network of 100 computers?
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...