Hi, I have been told to connect 3 office over internet cloud with redundant link to each site and utilize one link for ERP Application and another link for voice and Email. All sites are currently equiped with a cisco router and link to internet. Site to Site VPN fits my basic needs but I am not sure if we can dedicate one link for ERP application ( traffic Engineering )

Lets Say

Site A

Site B

Site C

Site A - total 250users

Site B - Total 400 users

Site C - total 150 users

Email Server will be hosted in Site A and site B

Application Server will be hosted in Site A

Site C needs to access email from Site B

Site B , Site C will access application form Site A

Site A and Site B will have Voice Server

Site A / Site B / Site C : to have two internet link from different ISP

If anyone can help with suggestion and recommendation keeping the above data in mind.

cheers

SJ