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LDP Configuration on
Alcatel-Lucent Service Routers

To do an LDP configuration example, we will use the below basic topology. Here, we will configure these two routers to become an LDP peer and establish an LSP session.

LDP configuration example topology, alcatel-lucent service routers, SR 7750

LDP Configuration Example Topology

Configuration on Router A

A:RouterA>config>router #
			interface “to_RouterB”
				address 10.0.0.1/24
				port 1/1/1
				exit
			interface “system”
				address 1.1.1.1/32
				exit
			exit

A:RouterA>config>router>ldp#
			interface-parameters
				interface “to_RouterB”
				exit
			exit

Configuration on Router B

B:RouterB>config>router #
			interface “to_RouterA”
				address 10.0.0.2/24
				port 1/1/2
				exit
			interface “system”
				address 2.2.2.2/32
				exit
			exit

B:RouterB>config>router>ldp#
			interface-parameters
				interface “to_RouterA”
				exit
			exit

Here, I would like to inform you about an important point. LDP sessions established between “transport addresses” of the routers. In Alcatel-Lucent service routers, this transport addresses are “system addresses”. The session is established between these system addresses. So, before LDP neighbour discovery, system addresses must be configured.

This transport addresses can be change to a different interface value to interoparability with other vendors’s routers. This can be done like below:

A:RouterA>config>router>ldp#
			interface-parameters
				transport address system (OR interface)
			interface "xyz"
				trasport address interface

LDP Verification Commands



show router ldp discovery

show router ldp discovery detail

show router ldp session

show router ldp parameters

show router ldp bindings (LIB Table)

show router ldp bindings active (LFIB Table)

show router fib 1 (FIB Table)

show router tunnel table

MPLS OAM Tools

To verify the connectivity of LSP you can use MPLS OAM tools. Lsp-ping and Lsp-trace is two of them. They are like normal ping and trace. You can us etme like below:

– oam lsp-ping prefix 2.2.2.2/32

– oam lsp-ping “to_RouterB” sent-count 3

– oam lsp-trace prefix 2.2.2.2/32

MPLS Label Distribution Protocol, LDP – Part 1
MPLS Label Distribution Protocol, LDP – Part 2
MPLS Label Distribution Protocol, LDP – Part 3 (Configuration on ALU)
MPLS Label Distribution Protocol, LDP – Part 4 (ECMP)
MPLS Label Distribution Protocol, LDP – Part 5 (Export and Import Policy, Prefix Aggregation)
MPLS Label Distribution Protocol, LDP – Part 6 (T-LDP)
MPLS Label Distribution Protocol, LDP – Part 7 (CR-LDP)

For more information about LDP, T-LDP and CR-LDP, check the related following RFCs…

RFC 5036: LDP Specification
RFC 3815: Definitions of Managed Objects for the MPLS,LDP
RFC 3478: Graceful Restart Mechanism for Label Distribution Protocol
RFC 5443: LDP IGP Synchronization
RFC 7307: LDP Extensions for Multi-Topology
RFC 7361: LDP Extensions for Optimized MAC Address Withdrawal in a H-VPLS
RFC 3212: Constraint-Based LSP Setup using LDP
RFC 3213: Applicability Statement for CR-LDP 
RFC 3214: LSP Modification Using CR-LDP


…YOU CAN REACH ALL THE “MPLS” ARTICLES AND CONFIGURATIONS BELOW…

MPLS Basics
What is MPLS?
Enabling MPLS on Cisco Router

MPLS Label Distribution Protocol, LDP
MPLS Label Distribution Protocol, LDP – Part 1
MPLS Label Distribution Protocol, LDP – Part 2
MPLS Label Distribution Protocol, LDP – Part 3 (Configuration on ALU)
MPLS Label Distribution Protocol, LDP – Part 4 (ECMP)
MPLS Label Distribution Protocol, LDP – Part 5 (Export and Import Policy, Prefix Aggregation)
MPLS Label Distribution Protocol, LDP – Part 6 (T-LDP)
MPLS Label Distribution Protocol, LDP – Part 7 (CR-LDP)

MPLS, RSVP-TE
MPLS, RSVP-TE – Part 1
MPLS, RSVP-TE – Part 2(Alcatel-Lucent Configuration)

MPLS Protection And Restoration
MPLS Protection and Restoration – Part 1
MPLS Protection and Restoration – Part 2 (End-to-End Protection, Secondary Paths)
MPLS Protection and Restoration – Part 3 (Path Diversity in Secondary Paths)
MPLS Protection and Restoration – Part 4 (Local Protection, Fast Reroute)
MPLS Protection and Restoration – Part 5 (Fast Reroute Protection Types)
MPLS Protection and Restoration – Part 6 (RSVP Objects Used for MPLS Fast Reroute)
MPLS Protection and Restoration – Part 7 (Verification Commands on Alcatel-Lucent Routers)
MPLS Protection and Restoration – Part 8 (Actions After the Failure)
MPLS Protection and Restoration – Part 9 (Convergence Factors)
MPLS Protection and Restoration – Part 10 (Juniper Configuration Samples)
MPLS Protection and Restoration – Part 11 (Juniper Configuration Samples)
MPLS Protection and Restoration – Part 12 (Juniper Configuration Samples)
MPLS Protection and Restoration – Part 13 (Juniper Configuration Samples)


…You Can Join Our “IPCisco” Groups Below!!!…

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About the Author
Gokhan Kosem is a telecommunation and network engineer. His ambition to IP networks and end-to-end system installation made him to prepare this web-site. By sharing his experiences about various networking protocols beside different system installation experiences and Cisco, Juniper, Alcatel-Lucent devices configurations, he is aimed to be helpful for his collegues in all over the world. He is currently lives in Istanbul, Turkey.

One comment for “MPLS Label Distribution Protocol, LDP – Part 3 (Configuration on Alcatel-Lucent Routers)”

1
Jama Yassin

Hi Gokhan, can LDP alone work without enabling MPLS in ALU service router?.

I saw router working fine in LDP, but after I issue show router mpls lsp, it show’s this error (MINOR: CLI MPLS is not configured.).

but show router ldp binding is showing normal operational behavior.

Regards.

May 21st, 2015 at 08:48

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