help: Disable split horizon
create: vtysh -c "configure terminal" -c "interface $IFNAME" -c "no ipv6 ripng split-horizon"
delete: vtysh -c "configure terminal" -c "interface $IFNAME" -c "ipv6 ripng split-horizon"

commit:expression: ($VAR(../poison-reverse/) == "");  \
    "You cannot have 'split-horizon poison-reverse' enabled with 'split-horizon' disabled for $IFNAME"