[c-nsp] mpls on RR ?

[selamat pagi]

I believed that mpls is not needed on ipv4 RR and vpnv4 RR.
(as RR should not be in the forwarding path)

Now, I came across some examples with mpls enabled on RR and want to verify
if there are
reasons for enabling MPLS in network offering Internet-accees and L3VPNs ?

cheers, keti