release-20.1:Backport!3625

Closed Andrey Vertiprahov requested to merge cherry-pick-8e314915 into release-20.1

#1298 (closed) PrefixDiscovery takes account of MO's VRF

See merge request !3625 (merged)

(cherry picked from commit 8e314915)

10a4e66f #1298 (closed) PrefixDiscovery takes account of MO's VRF

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