300-415 · Question #338
What is the result during a WAN Edge software upgrade process if the version of the WAN Edge software is higher than the one running on a controller device?
The correct answer is B. The upgrade fails with a warning message. In Cisco SD-WAN, controller devices must run software equal to or higher than WAN Edge devices. Attempting to upgrade a WAN Edge to a version higher than the controller results in a failure with a warning message.
Question
Options
- AThe upgrade button is greyed out.
- BThe upgrade fails with a warning message.
- CThe upgrade proceeds with a warning message.
- DThe upgrade proceeds with no warning message.
How the community answered
(53 responses)- A4% (2)
- B94% (50)
- D2% (1)
Why each option
In Cisco SD-WAN, controller devices must run software equal to or higher than WAN Edge devices. Attempting to upgrade a WAN Edge to a version higher than the controller results in a failure with a warning message.
The upgrade button is not greyed out because the system allows the attempt to be initiated before enforcing the version check.
Cisco SD-WAN enforces a version compatibility rule requiring that controller devices (vManage, vSmart, vBond) run software at the same or higher version than WAN Edge devices. When the WAN Edge target version exceeds the controller version, the system actively blocks the upgrade and generates a warning message rather than allowing an incompatible state to proceed.
The upgrade does not proceed under any condition when the WAN Edge version would exceed the controller version - it is blocked outright.
The system does not silently allow an incompatible upgrade; it always surfaces a warning when the version constraint is violated.
Concept tested: SD-WAN software version compatibility enforcement
Source: https://www.cisco.com/c/en/us/td/docs/routers/sdwan/release/notes/compatibility-matrix/cisco-catalystsd-wan-compatibility-matrix.html
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