This blog was originally started to better help me understand the technologies in the CCIE R&S blueprint; after completing the R&S track I have decided to transition the blog into a technology blog.

CCIE #29033

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Tuesday, July 26, 2011

NX-OS ISSU

ISSU (In-Service Software Update) - Provides the ability to upgrade software without disrupting operations. The system performs the following steps to ensure a non disruptive upgrade:
  1. Active and Standby Supervisors and all line cards BIOS's are upgraded
  2. Standby Supervisor is upgraded and rebooted
  3. Once the Standby Supervisor comes online with the upgraded version of NX-OS a stateful switchover is performed. All control plane traffic is now running on the former Standby Supervisor which is now the Active Supervisor.
  4. The new Standby Supervisor (former Active Supervisor) is now upgraded.
  5. Upgrade is performed on the Line Cards on are a time and then reloaded. The reload is non disruptive and is only performed on the CPU, no data plane components are impacted.
  6. CMP (Connectivity Management Processor) on both Supervisors are upgraded. 
Posted by Packets Analyzed at 6:00 AM
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