For J-series Services Routers, you can configure virtual channels, which allow you to limit traffic sent from a corporate headquarters to branch offices. Virtual channels might be required when the headquarters site has an expected aggregate bandwidth higher than that of the individual branch offices. The router at the headquarters site must limit the traffic sent to each of the branch office routers to avoid oversubscribing their links. For instance, if branch 1 has a 1.5-megabits per second (Mbps) link and the headquarters router attempts to send 6 Mbps to branch 1, all of the traffic in excess of 1.5 Mbps is dropped in the ISP network.
This chapter discusses the following topics: