Cisco Cisco IOS Software Release 12.0(23)S

LDP is an IETF standards tracking protocol. The primary benefit of LDP over the prestandard TDP 
protocol is that the former increases the number of platforms on which MPLS interoperability can be 
achieved.

The MPLS Label Distribution Protocol is used in conjunction with the following: 

Multiprotocol Label Switching (MPLS)

Cisco Express Forwarding (CEF)

MPLS Traffic Engineering

MPLS Class of Service

MPLS Egress NetFlow Accounting

AAL5 Transport over MPLS

MPLS VPNs

For additional information about MPLS functionality running on routers or switches in a network, 
consult the following documentation:

Multiprotocol Label Switching on Cisco Routers

 

MPLS Class of Service (CoS)

MPLS Traffic Engineering and Enhancements

MPLS Egress Netflow Accounting

 

AAL5 Transport Over MPLS

MPLS Virtual Private Networks (VPNs)

LDP is supported on the following platforms:

Cisco 2600 series routers

Cisco 3600 series routers

Cisco 4000 series routers

Cisco 7200 series routers

Cisco 7500 series routers

Cisco 12000 series router 

The MPLS Label Distribution Protocol is also supported on the Cisco MGX 8850 with the Cisco MGX 
8850 Route Processor Module (RPM-PR).