[dev] Feeding raw BGP path data to custom backend

[rsa]

Hi,
I am new to FRR. Pardon me if this is not the right forum to ask this
question.

We are interested in using the BGP component of the FRR package.  I have a
few questions on how we can customize it for our special use case.  What we
would like to do is
1. turn off Zebra interface as we are not interested in the route
computation or sending those routes to Kernel.
2. send BGP post-policy path data to the backend "Watcher" that knows how
to handle special cases based on custom community information.

Further, is there support for EVPN (type 5) in FRR implementation?

Has anyone attempted to feed raw path data (post policy) to a backend
Watcher?
Appreciate any input.  Thank you in advance.

Ravi
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