I currently have to offices and we recently signed up for new hosted phones as well as MPLS to connect the two offices. I dont have any experience with networking multiple locations together or with MPLS and am looking for some guidance / best practices.
Our main office is using a 172.16.0.0/24 network with multiple vlans. This office has a 3750 performing the routing between vlans and an asa 5510 as a firewall.
Our remote office is using a 10.45.0.0/16 flat network with no vlans and no managed switches. I plan on putting a managed 2960 layer 2 switch in place there as well as a new firewall.
The idea is that our main office will get new bonded T1's for phone and MPLS since we already have another internet line. The remote office will get new bonded T1's for phones, internet, and MPLS. The carrier is going to be putting their own managed switches at each location.
I want to get rid of the 10.45.0.0/24 at the remote office. Would I use something like a 172.17.0.0/24 network so it will be 172.16.0.0/24 at the main office and 172.17.0.0/24 at the remote office? And if we add another office at some point, it just go up from there?
Since I want to purchase a layer 2 switch at the remote office, do you think the carrier would use their switch to do layer 3 routing? I would like to have a couple of VLAN's at that office but I cant afford a layer 3 switch or router right now. At a minimum, I would like the phones and general network to be on a separate vlan at the remote office.
Is it possible to route the same subnet or vlan across a MPLS to both offices or is that not recommended?
Do you have any information on what kind of things I would need to set up on my network / firewall to make this stuff happen?
Anything else you can think of that I should be aware of?
In addition, I was thinking of putting a read only domain controller with DHCP and DNS at the remote office. Our ERP system is hosted at our main office. When people are in the remote office, I would like the ERP to resolve through the MPLS rather than the general internet in hopes it will be faster for them. When outside the office, the name can resolve over the internet.