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Implementing Cisco Networking Solutions by Harpreet Singh

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Link aggregation

Another way to break the loop is to treat the two links between a set of devices as a single logical entity. This is called link bundling or link aggregation and is defined in the specification IEEE 802.3ad.

While running STP puts all alternate links in standby mode and doesn't use the available capacity, aggregating the links allows the network administrator to increase the available capacity between a pair of switches.

Note that 802.3ad link aggregation works on links between a set of switches. This does not help in cases where a switch has two uplinks, each terminated on a different switch. In such scenarios, we can either use first-hop redundancy protocols to achieve load balancing across the uplinks as discussed later ...

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