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Interface Backup Fails to Take Effect

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Hello everyone,

As shown in Figure 1, RouterA and RouterB are connected.

Multiple interfaces on RouterA back up one another:
  • Interface1 is the primary interface.

  • Interface2 and interface3 are backup interfaces.

Figure 1 Networking diagram of interface backup 
Interface backup cannot take effect in the following situations:
  • Backup interfaces become unavailable after the primary interface fails.

  • In load balancing mode, load balancing cannot be implemented among the primary and backup interfaces because they cannot all be in Up state simultaneously.

  • In load balancing mode, traffic cannot be load balanced among multiple interfaces.

This fault is commonly caused by one of the following:

The physical status of backup interfaces is Down.

The link layer status of backup interfaces is Down.

In load balancing mode:

The load balancing threshold and maximum bandwidth are not configured for the primary interface.

An equal-cost route is not generated.

Only one flow needs to be transmitted.

That is all I want to share with you! Thank you!

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