MPLS doesnt work with edundant link

The P router is connected with PE via 2 link. One is working as primary, and other one working as secondry. When i shut down the primary link, the MPLS traffic works well. But, when i bring the primary link up and shut down the secondry link, MPLS traffic doesn't work. Whereas, there is no problem in the normal IP traffic. But, when i shut and no shut the primary interface, MPLS traffic starts working normal. What could be the problem? Attached is the configuration of PE device for your refrence? By the way, P device is from Huawei. I really need to solve this problem as soon as possible. Please respond.
interface GigabitEthernet3/4
description __________________________
ip address 72.178.x.x.255.255.252
ip ospf message-digest-key 1xxx
ip ospf cost 100
speed nonegotiate
mpls label protocol ldp
tag-switching ip
no cdp enable
end
interface GigabitEthernet3/3
description _______________________
ip address 52.178.x.x.255.255.252
ip ospf message-digest-key xxx
speed nonegotiate
mpls label protocol ldp
tag-switching ip
no cdp enable

Hi,
In fact it should work except of maybe a transient connectivity break because of a race condition. OSPF and LDP will start sending hellos and setting up adjacencies and LDP session, respectively.
Once OSPF is converged it will start using the new/reenabled link. OSPF routing decision does not take LDP availability into account. So when LDP is not ready yet, but OSPF decides to send all traffic over the primary link, there are no labels yet (show mpls forwarding-table, search for "untagged"). Thus connectivity for VPN traffic is broken.
One way of overcoming this is to use targeted LDP:
R(config)# mpls ldp neighbor x.x.x.x targeted ldp
This means the LDP session is kept even if the interface is down, as long as x.x.x.x has IP connectivity.
Now all this said, it should recover without manual intervention. Your config looks fine to me. Have you checked, what the underlying problem is?
show mpls ldp discovery ! are LDP hellos sent and received after link recovery?
show mpls ldp neighbor ! is LDP session reestablished?
show mpls forwarding-table ! are labels entered into LFIB after link recovery?
Targeted LDP might still solve your problem, because you would not loose the LDP session.
Hope this helps! Please rate all posts.
Regards, Martin

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