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nx.os.and.cisco.nexus.switching.2nd.edition.1587143046

Nexus Switching 2nd Edition

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Chapter 6. High Availability<br />

This chapter covers the following topics focused on high availability:<br />

• Physical redundancy<br />

• Generic online diagn<strong>os</strong>tics<br />

• NX-OS high-availability architecture<br />

• Process modularity<br />

• Process restart<br />

• Stateful switchover<br />

• Nonstop forwarding<br />

• In-Service Software Upgrades (ISSU)<br />

Requirements in the data center are rapidly changing—where there were once generous<br />

maintenance windows, now there are none. Best effort delivery of service has been<br />

replaced with strict service-level agreements (SLAs), sometimes with financial penalties<br />

incurred to lines of business or customers. This chapter introduces various hardware <strong>and</strong><br />

software components that make the Nexus 7000 a highly available platform to meet these<br />

changing data center requirements. Furthermore, as chassis-based solutions provide the<br />

highest levels of high availability, this chapter focuses primarily on the Nexus 7000 series<br />

switch.<br />

Physical Redundancy<br />

Redundancy within the Nexus 7000 begins at the physical chassis <strong>and</strong> extends into the<br />

software <strong>and</strong> operational characteristics of the system. To provide a redundant hardware<br />

platform from which to build on, the Nexus 7000 provides the following hardware<br />

components:<br />

• Redundant power supplies<br />

• Cooling system<br />

• Redundant supervisors<br />

• Redundant Ethernet Out-of-B<strong>and</strong> (EOBC)<br />

• Redundant fabric modules<br />

The Nexus 5500, 3000, <strong>and</strong> 2000 series also provide various redundant hardware<br />

components:<br />

• Redundant power supplies<br />

• Cooling system<br />

The following sections describe the highly available components of the Nexus series<br />

switches in greater detail.<br />

Redundant Power Supplies<br />

Several power supply options exist for the Nexus 7000 series. The Nexus 7009 provides the

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