Limitations
The following are the known problems and limitations with the customized ISO:
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Building and booting GISO for asynchronous package (a package of different release than the ISO) is not supported.
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Verifying the XR configuration is not supported in the GISO build script
gisobuild.py
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Renaming a GISO build and then installing from the renamed GISO build is not supported.
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The Cisco IOS XRv 9000 Router does not support GISO creation with optional files like custom configuration and ZTP.ini.
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The Cisco IOS XRv 9000 Router does not support GISO creation for XRv9K vRR profile.
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Automatic GISO post build scripts are discontinued.