Updated new RB951G to 6.49.2, reset to factory, and started to config.
When adding route: /ip route add 0.0.0.0/0 gateway=x.x.x.x pressing Tab and see suggestion to add @main to ip address - x.x.x.x@main .
Is it some lame-backported feature from v7?
Because there is neither /routing/table section not routing-table parameter in v6. Only in /ip route rule parameter "table"