static: T9482: handle a blackhole next to a next-hop of the same distance

FRR staticd refuses a blackhole or reject route next to a next-hop or
interface route of the same prefix and distance. VyOS accepted the
combination, the commit failed later in frr-reload and on some FRR
versions the config manager stalled.

Add a disable node to blackhole and reject. Verification refuses an
enabled blackhole or reject route next to a next-hop, interface or
dhcp-interface route of the same distance, and blackhole together with
reject, in routes, tables and VRFs. The same applies to the default
route of a PPPoE interface and of a DHCP interface that has a gateway.
A commit that changes only such an interface does not run the check,
frr-reload refuses it and the commit is rolled back.

A config migration sets disable on the route FRR did not apply, so
existing configurations keep loading and route as before.

0 files changed, 0 insertions, 0 deletions