If they're routing packets for us, they must have our routes. (Shopforbandwidth, n.d.)
If we decide to migrate to an MPLS network provider, and we run Open Shortest Path First (OSPF) as our dynamic routing protocol, all sites have to have access to every other site. At the central site, we have an Internet circuit. (Shopforbandwidth, n.d.)
Think of the MPLS provider's router as the "big" router in the cloud. All of our routers connect to its router, and we're routing the traffic together. Therefore, the MPLS providers are responsible for the routing. (Shopforbandwidth, n.d.)
If we make changes to the routing protocol, we may need to request that the provider reconfigure its routing protocol. In most cases, however, we can just add a new LAN subnet without informing them at all, and the dynamic routing protocol does its job. Or, if we want to do this without involving the carrier, we could distribute a default route through the dynamic routing protocol and assuming the carrier doesn't have any filters, the remote routers should be able to access the Internet using this default route. (Shopforbandwidth, n.d.)
Another option is to use the static route mentioned above. Advanced Network Analysis Techniques.
ReferencesShopforbandwidth n.d., Differences between MPLS and frame relay, viewed 5 June 2009, http://www.shopforbandwidth.com/Differences-between-MPLS-and-frame-relay.php
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