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Reliability Design
Link Reliability
On a campus network, two uplinks are usually used to improve the reliability of links between devices. In addition, for redundant links, Link Aggregation Control Protocol (LACP) is commonly used to virtualize multiple physical links into a logical Eth-Trunk. The interfaces on the Eth-Trunk are called Eth-Trunk interfaces. As shown in Figure 2-126, link aggregation has the following advantages:
- Increasing bandwidth: The maximum bandwidth of a link aggregation group (LAG) is the sum of bandwidth of the member interfaces in the LAG.
- Improving reliability: When an active link fails, the traffic carried over this failed link is switched to another functional active link, improving LAG reliability.
- Achieving load balancing: In a LAG, traffic is load balanced among all functional active links.
