Label distributing protocol (LDP) is a protocol that is automatically generated and exchanges labels between MPLS routers. Each MPLS router
will locally generate labels for its prefixes and then it will advertise the
label values to its neighbors.…
Label distributing protocol (LDP) Work with IGP inside the core.
It’s a standard protocol; LDP is based on Cisco’s proprietary Tag Distribution
Protocol (TDP). LDP establishes a neighbor relationship using UDP (port 646)
hellos multicast packets are sent 224.0.0.2. Each router has a unique router ID called LSR ID.
How does Label distributing protocol (LDP works?
- IGP built routing table (fib using CEF)
- LSR assigns a local label for each route learned
- LSR share labels with a neighbor using LDP
- LSR built their own LFIB
- Forward packets based on label lookup
