Cisco Catalyst SD-WAN Upgrade Guide

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Cisco Catalyst SD-WAN Upgrade Guide

Review restrictions for software upgrade

Updated: July 1, 2026

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Provides important restrictions for software upgrade when TLOC extension is configured, including affected and fixed releases, and required actions to avoid device crashes during upgrade.

This reference describes the restrictions that apply to software upgrades when a device is configured with a TLOC extension, including affected releases, upgrade limitations, and required actions to prevent device crashes.

TLOC extension configuration

If a device

  • is using Cisco IOS XE Catalyst SD-WAN Release 17.9.x or earlier, and

  • the device has a tunnel interface configuration includes a TLOC extension,

then you cannot upgrade to one of these:

  • 17.12.1 through 17.12.4

  • 17.15.1 through 17.15.2

Attempting such an upgrade causes the device to crash and enter a rollback state.

If you have a TLOC extension configured and need to perform such an upgrade, remove the TLOC extension configuration from the tunnel interface configuration before upgrading.

This issue was fixed and does not apply for upgrades to one of these releases:

  • 17.12.5 and later releases of 17.12.x

  • 17.15.3 and later releases of 17.15.x

  • 17.18.1a and later