It is possible to install a route-map which filters the routes between routing daemons and the OS kernel (zebra)
As of now this can be done by e.g.
* `set protocols ospf route-map foo`
* `set protocols ospfv3 route-map foo`
* `set protocols bgp route-map foo`
Which in turn will install the following lines into FRR
* `ip protocol ospf route-map foo`
* `ipv6 protocol ospf6 route-map foo`
* `ip protocol bgp route-map foo`
The current state of the VyOS CLI is incomplete as there is no way to:
* Install a filter for BGP IPv6 routes
* Install a filter for static routes
* Install a filter for connected routes
Thus the CLI should be redesigned to close match what FRR does for both the default and any other VRF
* `set system ip protocol ospf route-map foo`
* `set system ipv6 protocol ospfv3 route-map foo`
* `set system ip protocol bgp route-map foo`
* `set system ipv6 protocol bgp route-map foo`
The configuration can be migrated accordingly