Configuring P2MP LSPs in provider Tunnels

maynou_21

Hi.
I want to configure a P2MP LSP in a provider tunnel. I found this link:
Configuring Traffic Engineering P2MP LSPs in Provider Tunnels - JUNOS Release 9.0 Feature Guide
It's mentioned that I must configure P2MP TE support on each P router. How can I do it?

This is my configuration

[edit protocols mpls]
lab@PE1# show
label-switched-path PE1-to-PE3 {
to 33.33.33.33;
}
label-switched-path PE1-to-PE4 {
to 44.44.44.44;
}
label-switched-path PE1-to-PE2 {
to 22.22.22.22;
}
label-switched-path P2MP-LSP {
template;
p2mp;
}
interface ge-5/3/2.0;
interface lo0.0;

[edit routing-instances VPN provider-tunnel]
lab@PE1# show
selective {
group 224.1.1.1/32 {
source 192.1.1.1/32 {
rsvp-te {
label-switched-path-template {
P2MP-LSP;
}
}
}
}
}

when I ping 224.1.1.1, it works very fine. But, when I use Wireshark to capture packets, I find a GRE encapsulation and there is no MPLS header. Is this normal??