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Upgrade OS10 on VLT nodes with minimal traffic loss
This section describes the steps to upgrade OS10 on VLT peer nodes.
When you upgrade VLT peer nodes, you might see minimal traffic loss.
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.
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 VLT node and prevents maximum
traffic loss.
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 the 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.x or previous release to 10.5.1.x or later release, see:
Upgrade from 10.5.0.x or earlier to 10.5.1.x or later
VLT upgrade in a VLT or VXLAN topology when network statements are used to advertise prefixes
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Getting Started with Dell EMC SmartFabric OS10