The closest I have ever come to an hp switch is looking at a brochure, can't help you there.
With that being said, the fundamentals are still the same whether the vendor be juniper, cisco or hp. In order for devices in layer 2 vlans to communicate with devices in other layer 2 vlans, you need a layer 3 device. If your hp 2650 is a layer 3 switch, by default all vlans with connected layer 3 interfaces will be able to communicate with each other. Your default route will send all unknown traffic out the gateway of last resort, and hopefully, you have a route back to your subnetworks on the HP2650.
I have to set up vlans as follows on HP 2650 switch
ip address 10.91.5.1 255.255.255.0
ip address 10.91.10.1 255.255.255.0
ip address 10.91.15.1 255.255.255.0
ip route 0.0.0.0 0.0.0.0 10.91.1.254 (next hop address- ethernet IP address of WAN router connected to this switch)
These ports 10,11,12 will be connected to other 3 HP switches. I want hosts in different VLANs can communicate outside network
Do i need anything else?
I am new to HP switch. Please correct me if i am wrong