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How do I enable MPLS on my Cisco router?



Misconfiguration is a usual cause of MPLS difficulties. As a result, this part will go over MPLS settings. When configuring an MPLS, three device varieties may get configured: the P router, the CE router, and the PE router. This section describes the mpls configuration tutorial step by step of each of these devices.

Configuration of the CE router:

There is no unique configuration required for the CE router. The sole restriction is that the routing protocol utilized between CE routers must be RIP version 2, EIGRP, OSPF, or EBGP for the time being. Static routes are also an option.

Configuring the PE router:

Setting up the PE router is far more crucial than setting up the CE router. The following are summaries of the fundamental mpls configuration tutorial step by step:

1. Set the loopback interface as the BGP update source and the LDP router ID:

To serve as an update source for BGP sessions, you must configure a loopback interface as well as the LDP router ID. Check that the IP address on the loopback interface has a 32-bit mask. It will save you a lot of time and worry later on.

2. Enable CEF:

Make sure that CEF is enabled. MPLS will not function if CEF is unenabled on the PE router.

3. Configure LDP:

If you utilize LDP in the MPLS backbone, you must configure it afterward. It is important to note that TDP is the default label distribution technique on Cisco routers.

4. TDP / LDP Router ID Configuration (Optional):

The TDP / LDP Router ID is the upcoming step to configure. However, this step is optional as you can readily identify TDP / LDP routers in the network, and it can help with troubleshooting.

5. Configure MPLS on primary interfaces:

The next step is to activate MPLS on the interfaces to other PE and P routers. When enabling MPLS on the first interface, it is also enabled on the router globally.

6. Configure the MPLS VPN backbone IGP:

While any IGP may get used for IP access within the MPLS VPN backbone, ISIS and OSPF get utilized since they are the only two IGPs that presently allow MPLS traffic loads engineering. The OSPF and ISIS protocol settings discussed in the following two sections are simply samples.

7. Configure global BGP settings as follows:

MP-BGP is helpful in client routes promotion between PE routers across the MPLS VPN backbone. MP-BGP configuration is a two-step process that begins with neighbors configuring globally and then enabling them to share MP-BGP routes under the VPNv4 family address (VPNIPv4).

8. Enable MP-BGP Neighbors:

MP-BGP is a protocol that is helpful to share VPN routes across PE routers. The VPNv4 address family must have MP-BGP route exchange enabled.

9. Configure the VRF interfaces:

The client interfaces must get bound after configuring the VRF, after configuring the VRF.

10. Configure PECE Routing Protocols / Static Routes:

The PECE routing protocol configuration differs depending on whether you use EBGP, EIGRP, OSPF, or RIP version 2. Static routes can also be helpful to link PECEs.

11. Setup MPBGP client route redistribution:

The final step is to configure MP-BGP client route redistribution.


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