[mpls-linux-general] why I can not capture the LDP Hello packet?

[Shan J. <sha...@gm...>]

I have installed the rpm packages successfully. My platform is FC2 and
the packages are :
kernel-2.6.9-1.6_FC2mpls_1_946.i686.rpm;
iproute-2.6.9-3mpls1_946.i386.rpm;
quagga-0.97.3-1.FC3mpls1_946.i386.rpm

My configurations are:
zebra.conf:
hostname NP1
password zebra
enable password zebra
!interface lo
interface eth0
!multicast
!
ip route 2.0.0.0/8 1.0.0.254
!
log file zebra.log

ripd.conf:
hostname NP1
password zebra
router rip
!
network eth0
!
log file ripd.log
!

ldpd.conf:
hostname NP1
password root
enable password root
!
mpls ldp
!
interface lo
!
interface eth0
 mpls ldp
!
line vty
!
log file ldpd.log


then I run ethereal and capture packets on eth0, I could get the rip
Request packet but none packet about LDP, I think I should get the LDP
hello packet if LDP is runing well, Then what's wrong about me ? Is my
configuration wrong?

I will appreciate about your kind help.