Link Aggregation Overview
Link Aggregation (LAG) is a mechanism used to aggregate physical interfaces or ports to create a logical entity called link bundle.
Traditionally LAG is a trunking technology that groups together multiple full-duplex IEEE 802.3 Ethernet interfaces to provide fault-tolerant high-speed links between switches, routers, and servers. LAG forms a single higher bandwidth routing or bridging endpoint and was designed primarily for host-to-switch connectivity. Following are the benefits:
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Logical aggregation of bandwidth
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Load balancing
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Fault tolerance
In NCS 4000 Series Routers, primary application of LAG is to provide connectivity to Access devices like NCS4200 Series and on the core side provide connectivity to Multi-service Edge (NCS 6000 Series) and Core Routers (like NCS 6000 Series).