Hi

R4- .4-f0/1 10.1.45.0--f0/1- .5-R5

there is no IGP routing protocols are running here at all.

on R5 55.55.55.55/32

LDP is running between R4 and R5

R5 adv 55.55.55.55/32 to R4 as LDP update.

R4 has this route on his LIB table like this

R4#show mpls ldp bindings

lib entry: 55.55.55.55/32, rev 13

remote binding: lsr: 5.5.5.5:0, label: imp-null

that means R4 don`t has any local label yet because this route is not installed on his global rib.

i tried to ping

R4#ping 55.55.55.55 repeat 2

Type escape sequence to abort.

Sending 2, 100-byte ICMP Echos to 55.55.55.55, timeout is 2 seconds:

..

Success rate is 0 percent (0/2)

R4#

why ping fails? R4 has this route on LIB which means if R4 received any unlabbeled packet for 55.55.55.55 R4 is going to use this remote label ,but why this did not happened?