Cisco Cisco IOS Software Release 12.4(3)

© 2005 Cisco Systems, Inc. All rights reserved.

Multiprotocol Label Switching (MPLS) Label Distribution Protocol (LDP) enables peer label switch 
routers (LSRs) in an MPLS network to exchange label binding information for supporting hop-by-hop 
forwarding in an MPLS network. This module explains the concepts related to MPLS LDP and describes 
how to configure MPLS LDP in a network. 

12.0(10)ST

This feature was introduced in Cisco IOS Release 12.0(10)ST, 
incorporating a new set of Multiprotocol Label Switching (MPLS) CLI 
commands implemented for use with Cisco routers and switches. The CLI 
commands in this release reflected MPLS command syntax and 
terminology, thus facilitating the orderly transition from a network using 
the Tag Distribution Protocol (TDP) to one using the Label Distribution 
Protocol (LDP). 

12.0(14)ST

This feature was integrated into Cisco IOS Release 12.0(14)ST. This 
release introduced several new MPLS CLI commands, provided support 
for MPLS VPNs by means of a new vrf vpn-name parameter in certain 
existing commands, and modified other commands to ensure consistent 
interpretation of associated prefix-access-list arguments by Cisco IOS 
software.

12.1(2)T

This feature was integrated into Cisco IOS 12.1(2)T. Also, the debug mpls 
atm-ldp api, debug mpls atm-ldp routes, and debug mpls atm-ldp 
states commands were modified.

12.1(8a)E

This feature was integrated into Cisco IOS Release 12.1(8a)E. 

12.2(2)T

This feature was integrated into Cisco IOS Release 12.2(2)T.

12.2(4)T

This feature was integrated into Cisco IOS Release 12.2(4)T. Also, support 
was added for Cisco MGX 8850 and MGX 8950 switches equipped with a 
Cisco MGX RPM-PR card, and the VPI range in the show mpls atm-ldp 
bindings and show mpls ip binding commands was changed to 4095.

12.2(8)T

This feature was integrated into Cisco IOS Release 12.2(8)T. This release 
introduced the debug mpls atm-ldp failure command.

12.0(21)ST

This feature was integrated into Cisco IOS Release 12.0(21)ST. This 
release introduced the mpls ldp neighbor implicit-withdraw command.