Branch office Internet connection - recommended Cisco hardware
Posted on 2012-08-12
This should be fairly simple, but wanting a sanity check...
Customer has several branch offices with lower-speed (1.5 to 4.5-Mbps - bonded T1s) connections back to the main office. Fiber connectivity with higher-speed Ethernet handoffs are not options for several of these sites, so they're only means of adding bandwidth is provisioning additional T1s, which is VERY expensive. The links are used for both business application traffic as well as centralized Internet through the main office, and lack of sufficient bandwidth is becoming a real problem.
They're looking to add new Internet connections at some of these branches (cable, business DSL, whatever is available), so that browsing traffic will stay off of the WAN, thus providing more available bandwidth for business apps and Citrix users. Each location has a carrier-managed router for circuit termination/bonding, and all branch traffic is currently being defaulted over this connection.
What would be the least expensive, "right" solution for a Cisco device to sit behind this carrier router, and handle sending traffic as appropriate over both? My first thought was something as simple as an ASA 5505, with all customer (private) routes statically defined to go over the WAN route, and a default route pointing over the new Internet connection. IP SLA could also be configured on the ASA so if the Internet connection went down, it could fail over Internet traffic back over the WAN once more.
Looking for validation, and other options/input.
Thank you, and reference links/docs are always appreciated!