Network refresh and standardization

Hey everyone,

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I'm looking for recommendations for a network refresh at my office. Been with the company for a few months now and am the single IT guy for 4 office locations that are spread throughout Canada.

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Currently we have Barracuda firewalls and Meraki wireless in place, for switching we have a huge mix of vendors(tplink, netgear, hp, cisco sg). The Cuda's are no longer on active support, Meraki is until 2022 and we need POE for our Avaya deployment voip throughout offices. We also need client VPN for remote staff functionality. Pretty heavy internal network traffic from file sharing to video conferencing all the time.

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Needs:

New firewalls

- site to site vpn

- reliable client vpn

- IPS/IDS/AV

- solid easy reporting

- drop ship deployment for new/warranty issues

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Switches

- POE - voip, AP's

- 10gb uplinks

- easy management interface

- drop ship deployment options

- redundant PSU's would be handy for remote sites

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Current network, each site is currently on a /16 subnet and most things are setup statically.

- vlans - not currently in place, but looking at setting up for security and IoT items

- network speeds are brutal, 3-10mb transfer rates

- heavy video conferencing

- file sharing, CAD, videos, marketing, office etc

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I've been looking at everything from Cisco/Meraki/Fortinet/Aruba, i'm not afraid of mixing up platforms to get the best case scenario. Overall just looking for input/advice for either an all in one setup or if i should be looking at mixing vendors but keep something standard through each platform.

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Thanks!