Label Withdraw in MPLS

Hi,
 
I am trying to understand the Label Withdraw feature in MPLS. As per the book
it says:
 
"When an LDP peer advertises a label binding, the receiving LDP peers keep it
until the LDP session goes down or until the label is withdrawn. The label
might be withdrawn if the local label changes. The local label might change
if, for example, the interface with a certain prefix on it goes down, but
another LSR still advertises the prefix."
 
If I am correct, when suppose g0/0 configured with 1.1.1.1 255.255.255.252
goes down in R1, in R1's LDP binding 1.1.1.1 which is having imp-null is
withdrawn.
 
R2 which will have 1.1.1.2 255.255.255.252 on g0/0 interface goes down. But
since it has a connected route in its RIB, it will still have a label entry
for 1.1.1.0/30. Will that label change when G0/0 goes down in R1?
 
What will be the impact of the below command in R1
mpls ldp neighbor 1.1.1.2 implicit-withdraw

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Received on Sun Jun 19 2011 - 00:15:48 ART