need help with resolving some network performance issues.
we have Watch guard XTM 505 firewall which currently set-up to do almost everything e.g. internal Subnets as separate physical networks on different ports on watch guard. so its routing traffic between internal networks like servers/desktops/printers etc.
and much more like spam filtering /VPN etc.
and its always in RED Bars for Traffic and Load status. and we want to ease it off by using a Layer 3 switch to do all internal traffic routing between internal networks
i have following subnets
172.16.12.0/24 servers (DHCP server 172.16.12.12) (DELL Switch)
172.16.13.0/24 desktops (Dell Switch)
172.16.14.0/24 remote office (netgear switch)
172.16.15.0/24 Citrix VDI desktops. (directly plugged into watchguard and NIC on VDI server)
i have a new Cisco SG300 10 ports Layer3 switch.
what i want is to configure ports on this switch and connect all my network/subnet switch to this.
and uplink this to Watchguard for internet traffic.
am very new to this VLAN setup , could someone please guide me on this what exactly i need to do on Cisco switch and on Watchguard
so that traffic from internal networks can talk to each other without going via watchguard and all outbound to internet can go via watchguard.
also DHCP relay needs to be sent to DHCP server in server's network with IP 172.16.12.12
Many Thanks in advance