Quagga. How to announce from the provider to the client?

Question

FreeBSD

Hello!
The task is the following, there is a router based on FreeBSD, BGP is raised with our up-link provider.
Our up-link announces UA-IX to us, that is, there are two vlan-a, one is WORLD, the second vlan is UA-IX.
A local provider connects to us, we need to announce it in the same way, that is, how to re-announce UA-IX from our up-link.
Everything is clear with the WORLD, here default. But with UA-IX it is not clear, I have never done this.
Who will tell what?