I'm looking for suggestions on equipment and configuration to accomplish this scenario.
Current Situation:
Building 1:
HP Procurve 4208vl Switch (@ 80% full)
Fortinet firewall, 10Mb dedicated Internet
Cisco 3640 router for internal routing
Point to Point Ubiquiti wireless link to Building 2
Avaya master PBX with PRI to other buildings and to PSTN
Separate vlan for unsecured wifi Internet
Building 2: HP Procurve 4208vl Switch (@ 80% full)
Fortinet firewall, 20Mb dedicated Internet
Cisco 3640 router for internal routing
Point to point Ubiquiti wireless link to Building 1
Point to multipoint Ubiquiti wireless links to Buildings 3 and 4
Avaya PBX with PRI back to Building 1
Separate vlan for unsecured wifi Internet
Building 3: HP Procurve 2650 48 port Switch
Cisco 2621 router for internal routing
Ubiquiti wireless link to Building 2
Avaya PBX with PRI back to Building 1
Separate 'guest' DSL internet for unsecured wifi
Bulding 4: 3x HP Procurve 2626 Switches
Cisco 2621 router for internal routing
Ubiquiti wireless link to Building 2
Avaya PBX with PRI back to Building 1
Separate 'guest' DSL internet for unsecured wifi
Each building has its own private subnet. Buildings 2, 3 and 4 currently use the Internet connection at building 2 for corporate PCs. There are servers in Buildings 1 and 2 that are accessible across the network.
The future:
We are adding a 100Mb layer 2 MPLS at each location. Also replacing the 10Mb Internet at building 1 with 100Mb DIA.
Goals:
1) Create site to site redundancy, using the MPLS as primary with the Ubiquiti as failover.
2) Implement IP trunks between the PBX units and eliminate the site-to-site PRIs.
3) Have all Internet traffic utilize the 100Mb link at Building 1, with failover to the 20Mb at Building 2 This would include the 'guest' networks as well, on their own VLANs
4) Eliminate the Cisco routers if at all possible (mainly due to age and speed limitations)
My real concerns are the network configuration, not the PBXs. I know we'll need a separate VLAN with QoS for that traffic.
In this scenario, would it make sense to eliminate the separate subnets at each building and make it one big network, configuring the MPLS and site to site wireless as trunks for the VLANs?
I'm looking for any suggestions and recommendations.