|I'm thinking that's a layer 2 switch (routing is done at layer 3) and if I'm correct, then you would still require a router between it and your first network (router) if you want to have everything connected to the Baystack on a separate subnet.|
I have an older Baystack 450 at home and it is only layer 2 and while I could segregate everything connected to it from the first network using VLAN's, I wouldn't be able to have internet access on machines plugged into it without a router. If however that is an L3 switch, then you could do this easily by configuring a new VLAN for your segregated network and putting VLAN 1 in the same network as the router.
If you wanted all your computers on the same subnet it would be easy as pie to setup. Just return the Baystack's config to default and give it an IP in the same range as the router (to enable remote access to the switch - not absolutely necessary) and then connect it to a LAN port on the router.
On an aside....the switches I use here at work are Avaya. Avaya bought them from Nortel. Nortel bought them from Baystack. Oddly enough, the CLI and telnet menu structure are still mostly the same as the 350/450's but with more options and such. Personally, I like them more than any others I've worked with over the years.
It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.