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Dell Configuration Guide for the S4048–ON System 9.14.2.5

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Shared LAG State Tracking

Shared LAG state tracking provides the flexibility to bring down a port channel (LAG) based on the operational state of another LAG.

At any time, only two LAGs can be a part of a group such that the fate (status) of one LAG depends on the other LAG.

As shown in the following illustration, the line-rate traffic from R1 destined for R4 follows the lowest-cost route via R2. Traffic is equally distributed between LAGs 1 and 2. If LAG 1 fails, all traffic from R1 to R4 flows across LAG 2 only. This condition over-subscribes the link and packets are dropped.

Figure 1. Shared LAG State Tracking
Illustration of shared LAG state tracking.

To avoid packet loss, redirect traffic through the next lowest-cost link (R3 to R4). Dell EMC Networking OS has the ability to bring LAG 2 down if LAG 1 fails, so that traffic can be redirected. This redirection is what is meant by shared LAG state tracking. To achieve this functionality, you must group LAG 1 and LAG 2 into a single entity, called a failover group.

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