[FRR announce] FRR and libyang2 update

[Donald Sharp]

All --

The latest libyang2 release 2.1.111 has an incompatible change to it's ABI
and causes FRR to no longer be able to work properly with it.  See this
issue filed for an explanation:

https://github.com/FRRouting/frr/issues/14258

Additionally it is discussed here:

https://github.com/CESNET/libyang/issues/2090

Since FRR needs to make changes to its code in order for FRR to continue to
use newer versions of libyang2 it is not recommended that anyone upgrade to
libyang2.1.111 or later at this point in time.  We currently expect to be
able to make these changes for the 9.1 release.

What can you do?

If you are using FRR 8.0 or later do not upgrade to libyang2.1.111 at this
point in time.  If you have, please downgrade to 2.1.80 or earlier.

thanks!

donald
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