From the high availability perspective, among all the redundancy implementations discussed in this chapter, NSR and NSB are the two best choices: they provide full standalone routing, switching, and forwarding redundancy. In the event of a control plane failure, traffic continues to flow, and no neighbors observe any change in control protocol maintenance.
However, because we all have multivendor network environments, and not all features are supported on all platforms or software versions, we have to assess each design separately to find the optimal redundancy solution. Because of tight protocol interaction, we must analyze each network requirement separately, and based on supported software and platforms, use some or all of the available high availability. Table 4-3 lists the JUNOS release support requirement information needed for you to make these choices.
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