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MPLS LSRs

Each LSR, also known as an MPLS node, must have the following:

At least one layer 3 routing protocol
A label distribution protocol
The ability to forward packets based on their labels

The router can use BGP, IS-IS, or OSPF as its layer 3 routing protocol, and BGP, LDP, or RSVP-TE as its label distribution protocol.

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