Overview

A redundant Ethernet (Reth) interface is a Layer 3 logical interface that uses two member interfaces to ensure link availability. One member interface is active and the other is inactive. When the active interface fails, the inactive interface becomes active. The member interface switchover does not interrupt traffic.

As shown in Figure 29the Reth interface uses the device bridge MAC address as its MAC address. The Reth interface can be configured with an IP address and security features (such as NAT and IPsec). Other devices are unaware of the member interfaces.

A Reth interface can be used independently or be added to a redundancy group. This chapter describes Reth interfaces that are used independently. For information about Reth interfaces in redundancy groups, see "Configuring redundancy groups."