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NX-OS Upgrade

ISSU and LACP Fast Rate

  • Configuration: (config-if)# lacp rate fast

  • NX-OS Upgrade can't be non-disruptive if there are ports in LACP fast mode. If a server connected to a switch port running fast rate, the switch ports will response as well although it is not configured as fast rate

  • Verification:

    • show lacp issu-impact

    • show lacp interface <$interface>:

      • LACP_Timeout=Short Timeout (1s): fast rate

      • LACP_Timeout LACP_Timeout=Long Timeout (30s): normal rate

  • Solution: Shutdown the ports and run upgrade, then enable ports again

ISSU and BGP

The following conditions are required to support ISSU:

  • Graceful restart must be enabled (default)

  • Keepalive and hold timers must not be smaller than their default values

  • If either of these requirements is not met, Cisco NX-OS issues a warning. You can proceed with the upgrade or downgrade, but service might be disrupted.

  • Note: Cisco NX-OS cannot guarantee ISSU for non-default timer values if the negotiated hold time between BGP peers is less than the system switchover time.

Reference

  • Upgrading a Cisco Nexus 9000 Series Switch: https://blog.muffn.io/posts/upgrading-a-cisco-nexus-9000-series-switch/

  • Nexus upgrade incompatible: https://community.cisco.com/t5/data-center-switches/nexus-upgrade-incompatible/td-p/3834777

  • ISSU and BGP: https://www.cisco.com/c/en/us/td/docs/switches/datacenter/sw/6_x/nx-os/unicast/configuration/guide/b-7k-Cisco-Nexus-7000-Series-NX-OS-Unicast-Routing-Configuration-Guide-Release-6x/n7k_unicast_config_adv_bgp.html#concept_D6A004F59BEC467AAF4A28F4E67FDDCF

  • Data Center Operations and Maintenance Best Practices: https://www.ciscolive.com/c/dam/r/ciscolive/emea/docs/2020/pdf/BRKDCN-2458.pdf

  • Simplifying Operations and Upgrades on Nexus using Modular NXOS Software: https://www.ciscolive.com/c/dam/r/ciscolive/global-event/docs/2022/pdf/BRKDCN-2639.pdf

  • Nexus 7000/7700 Software Upgrade Via ISSU. Complete Upgrade Guide, Configuration Check, Verifying ISSU Capability: https://www.firewall.cx/cisco/cisco-data-center/nexus-7000-nx-os-upgrade-via-issu.html

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