Enabling MPLS On Cisco Routers

In this article, we will study how to enable CEF, how to enable MPLS and how to configure label protocol ldp on Cisco routers.

During this survey we will check the configuretion with various basic show command that will be useful during MPLS configurations.

After successfully configuration of the core part, we will discuss hiding the core routes from the customer with disabling ttl propagate.

The topology that we will study on is below.

Before MPLS configuration, this configuration must be fully connected and you can ping from one end through the other. You will already find the GNS3 configuration file at the end of this article;)

Let’s start the configuration:

PE1 Router

PE1# configure terminal

PE1(config)# ip cef

PE1(config)# mpls label protocol ldp

PE1(config)# interface fastethernet 0/0

PE1(config-if)# mpls ip

PE1(config-if)# endPE2 Router

PE2# configure terminal

PE2(config)# ip cef

PE2(config)# mpls label protocol ldp

PE2(config)# interface fastethernet 0/0

PE2(config-if)# mpls ip

PE2(config-if)# endP1 Router

P1# configure terminal

P1(config)# ip cef

P1(config)# mpls label protocol ldp

P1(config)# interface fastethernet 0/0

P1(config-if)# mpls ip

P1(config-if)# exit

P1(config)# interface fastethernet 1/0

P1(config-if)# mpls ip

P1(config-if)# endP2 Router

P2# configure terminal

P2(config)# ip cef

P2(config)# mpls label protocol ldp

P2(config)# interface fastethernet 0/0

P2(config-if)# mpls ip

P2(config-if)# exit

P2(config)# interface fastethernet 1/0

P2(config-if)# mpls ip

P2(config-if)# endAfter the configuration of core routers(P1 and P2) and the customer edge routers(PE1 and PE2), it is time to verify our configuration.