Targeted LDP is a way for two routers to build an LDP session even if they are not directly connected. Normally, LDP works only between neighbors. But with Targeted LDP, routers can send special messages to reach routers far away, often across tunnels or different networks.
It is like saying: "Even if we are not next to each other, let’s still work together and exchange labels."
Where is Targeted LDP Used?
Layer 2 VPNs (Pseudowires):
To connect two distant sites over MPLS as if they are on the same network.
Inter-AS MPLS VPNs:
When two Autonomous Systems connect and need to exchange labels.
Over Tunnels (like GRE/IPSec):
When you build tunnels between routers and need LDP for label switching across the tunnel. Example: Remote LFA for Fast Reroute..
In short, Targeted LDP helps routers work together across long distances, making MPLS services possible even without direct physical links.
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