Currently, I have setup and configured MPLS VPN ( in the attachment ).
To simulate the LDP/TDP break, I remove the "tag-swithcing ip" in the MPLS Core routers in P3.
I presummed it is regarding blackholing of traffic appears eventhough at each particular PE's vpnv4 route already propagated.
Right now, the VPN part (labeling) already break but the IP packet level no problem at all, IP reachability is not an issues.
In the example in the attachment, the CE1-VPNA tend to go through PE2 -> P2 -> P3 -> PE3 -> CE2-VPNA because PE2 is no aware of the break at MPLS Core routers since there is an alternative route to reach PE3 via P1 which is PE2 -> P2-> P1-> P3-> PE3- CE2-VPNA .
My question is, how do I configure that PE2 is aware of the break existing in the core, and re-route to available path ? Maybe monitoring the LSP/TDP in MPLS Core would be better right? Perhaps some tunning in routing protocols or else? I'm using OSPF in the lab setup. The CE to PE is also using OSPF.
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