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ZEN master supports multi-level redundancy to ensure availability of the content delivery. Your deployment may include multiple redundant Target hosts. You can configure both the channel Channel (which outputs the content from ZEN Master) and the target Target (which receives the content) for redundancy. Redundancy of sources can be configured in Pass-Through channels Channels and redundancy of hosts can be configured in Push or RTMP targetsTargets. This feature is relevant for single bitrate push outputs only. Pull outputs enable any host to access the stream.

ZEN manages the various configurations as follows:→

• 1 source Source → 1 host - if there is one source Source in the channel Channel and one host in the target Target then the content is sent directly from the source Source to the host and the content is available as long as both elements are active. In this case, you don't need to configure a Secondary Source in the Channel nor an Alt. Target.
• 1 source Source → 2 hosts - if there is a single source Source in the channel Channel and there are two hosts in the targetTarget, the content is sent from the source Source to the primary host as long as it is available. If the primary host becomes unavailable then the source Source is sent to the alternate Target host. In this case, you don’t need to configure a Secondary Source, but will need to configure an Alt. Target.
• 2 sources Sources → 1 host – if there are two sources Sources in the channel Channel and one host in the target Target then two outputs are created (one on each Broadcaster) and both are pushed to the same Target host. The host receives the output from the primary source Source as long as it is available. If the primary source Source becomes unavailable, then the host receives output from the secondary sourceSource. Some services such as Akamai do not support output of multiple sources Sources to a single host. In this case, you need to configure a Secondary Source, but will not need to configure an Alt. Target.
• 2 sources Sources → 2 hosts – if there are two sources Sources in the channel Channel and two hosts in the target Target then two outputs are created (one on each Broadcaster) and each is pushed to a different host. As long as all elements are active the content is available on both hosts. If one path fails, then the other path remains available. For this configuration, the channel Channel status remains OK as long as one of the paths is active. In this case, you need to configure a Secondary Source and configure an Alt. Target. If you would like to monitor the status of each path separately, you must create two separate channels Channels and send each one to a different targetTarget. Then you will have two completely independent pathways for delivering identical content.