Image Upgrade by Traffic Diversion (IUTD)
Overview
Image Upgrade by Traffic Diversion (IUTD) is an uncommon method used for traffic diversion, during the upgrade or installation process to ensure continuous network operation by temporary re-routing network traffic to the different node and restoring the traffic flow to the updated node after verifying the service.
Feature Characteristics
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Minimal Traffic Loss: The IUTD process enables node software updates, resulting in minimum traffic loss during the brief convergence time required while switching traffic paths. |
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Traffic Handling: Traffic is manually diverted/rerouted (using edit-config) to the redundant mode before the upgrade and restored only after verifications are complete. |
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Redundancy Dependent: Requires the presence of a redundant node/path to handle the full traffic load during the maintenance window. |
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Service Monitoring: A NetConf filter checks the traffic status of specific services, such as VxLAN. |
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Real-Time Alerts: NetConf sends notifications whenever a service starts or stops carrying traffic, to enable quick operational response. |
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Controller Visibility: The controller receives both NetConf and SNMP notifications upon successful image upgrade completion, providing full visibility into the status. |
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Error Intimation: Failure occurs, error will be reported. OS download cancels and no impact on the system (System continues to be in the original condition). |
Prerequisites
Implementing the IUTD feature requires a NetConf client, such as Netopeer2, capable of utilizing the call-home functionality.
This feature applies exclusively to the VxLAN Multihoming (MH) scenario within a DC-CLOS architecture.