MPLS & Internet On single WAN

Am using single interface i,e port8 of XGS 2100 for MPLS & Internet bandwidth.

Both are configured on separate VLAN as WAN zone.

MPLS - 172.31.173.242/255.255.255.248 Port 51

IBW - 172.27.46.10/255.255.255.252 Port 201

I have natted IBW through a public IP to get internet.

Now my two Gateways are up & internet is available on my LAN port.

My client requirement is to pass internet to below pool

with the MPLS network.

No physical port can be used.

I have to do the Traffic shaping for internet pool.

Please help me in configuring the firewall.