Shared Lag State Tracking; Configuring Shared Lag State Tracking - Dell S6100 Configuration Manual

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Debug LACP, including configuration and events.

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 62. Shared LAG State Tracking

To avoid packet loss, redirect traffic through the next lowest-cost link (R3 to R4). Dell 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.

To configure shared LAG state tracking, you configure a failover group.

If a LAG interface is part of a redundant pair, you cannot use it as a member of a failover group created for shared LAG

state tracking.

Enter port-channel failover group mode.

CONFIGURATION mode

port-channel failover-group

Create a failover group and specify the two port-channels that will be members of the group.

CONFIG-PO-FAILOVER-GRP mode

group number port-channel number port-channel number

In the following example, LAGs 1 and 2 have been placed into to the same failover group.

Link Aggregation Control Protocol (LACP)