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13. Using Multiple 4G LTE Interfaces for Load-Sharing and
Balancing
Balancing
4G LTE is a Layer 3 wireless WAN connection. Every 4G LTE connection is considered as a Layer 3 point-to-point
connection from the mobile node (ISR) to the packet gateway in the service provider core. Because of the mobile
architecture, the two cellular interfaces from the same service provider cannot be bonded at the radio level in a
similar way as the Multilink PPP.
Cisco IOS Software has a rich feature set that allows it to use two simultaneous Layer 3 WAN connections to do
the load balancing of the existing traffic load in a branch office. The Cisco ISR can use the Cisco IOS Policy-Based
Routing (PBR) mechanism to send traffic across two different WAN interfaces. Cisco IOS Software has the Cisco
Performance Routing (Cisco PfR) feature, which allows the enterprise to deploy a network where the routers can
dynamically decide the most efficient way to use multiple WAN interfaces on a branch office to send traffic across
to the headquarters.
For more details about Cisco PfR, refer to the Cisco PfR technology page: