Users Guide

Upgrade OS10 on VLT nodes with minimal traffic loss
This section describes the steps to upgrade OS10 on VLT peer nodes with minimal traffic loss.
NOTE: The default X.509v3 certificates used for VLT convergence expire on July 27, 2021. See Dell EMC SmartFabric
OS10 certificate expiration and recommended action for additional information before you start the VLT upgrade procedure.
Summary of Upgrade Steps
1. Download the new OS10 image.
2. Install the image on VLT-Peer1 and VLT-Peer2 nodes.
3. Upgrade the secondary VLT node. The production traffic is not affected during this process because the primary VLT node
continues to forward traffic.
4. After the secondary VLT node upgrade is complete, upgrade the primary VLT node. During the primary VLT node upgrade,
the system reloads. During this reload, the secondary VLT node becomes the primary and continues to forward traffic.
The following describes the VLT upgrade process:
In this example topology:
● VLT-Peer1 and VLT-Peer2 are leaf nodes that are connected to the spine switch through port channel 10.
● Host1 is connected to both the VLT peer nodes through port channel 20.
● Host2 uses switch-independent NIC teaming.
● Switch1 is connected to the VLT peer nodes through port channel 30.
Important notes
● The ports that are connected to Host2 are not part of a VLT port channel. If you have this type of deployment, configure the
delay-restore for orphan ports feature on the VLT nodes to reduce traffic loss during upgrade or reload.
● When you upgrade one of the VLT peer nodes (for example, VLT-Peer1), the forwarding plane continues to forward the
traffic to the other node (VLT-Peer2).
● If you are upgrading VLT nodes from 10.5.0.5 or previous release to 10.5.1.9 or later release, see:
Upgrading OS10 software
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