Here you have a basic configuration about bridge groups and IRB. To those don't know what is it, Integrated Routing and Bridging. This is the way to extend a Vlan across routers, routers that can't offer ethernet switching services or through non ethernet interfaces.
First have to configure the bridge group, and assign this to the interfaces that will belong to the same bridge domain. The bridge route ip will allow to configure the L3 or routed interface that will bind to the bridge group.