I am working with a client who has some Cisco equipment.
network design is very simple now ; all machines in one VLAN and one subnet.
they like to go with a VLAN based solution , they have a Cisco switch 3750 (24 port) and a ASA (5510) . They also have six Dlink (layer3) switches.
The Idea is to use Cisco 3750 as a core switch ; subnet network to 5 different IP ranges ( for 5 departments ) and put each department on a separate VLAN.
They also have another location which will be connected to primary site using a site-to-site VPN (through Cisco ASA) .So ASA provides site-to-site connectivity and Internet access.
machines on that site also need to be in a different VLAN but should be able to talk to servers in primary site.
so .. with this scenario in mind ; here are my thoughts :
we need one dedicated switch on each subnet ( probably those Dlinks)
we need to enable trunking on each Dlink switch.
Each Dlink switch will be connected to core Cisco switch using its trunk interface.
Core switch performs required routing and send traffic to ASA if required.
Is this right ? I am not quiet sure if ASA should be VLAN aware too ... any thoughts ?
There is no need to dedicate one switch per VLAN unless you just wanted to, it is possible to simply assign different switchports to access the vlan intended. It would help to understand the physical topology to answer this question. Are the devices in these 5 different areas cabled back to the same data closet or different closets?
You would have all 5 Vlans on all switches and simply assign a range/specific ports to each VLAN. You could also use VTP to manage Vlans across the switches if you had a native cisco switching environment.
switchport access vlan 10
switchport access vlan 20
I would shutdown Vlan1 and pick one Vlan to be your management Vlan for your switches.
I would also recommend using RPVST - rapid per vlan spanning tree.