Two Methods of MPLS Interface Configuration within OSPF

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Within all of the practice labs I have worked through for the CCIE Lab exam and in most real world applications I have seen, MPLS networks are run on top of (or within) an OSPF network. Configuring the OSPF and MPLS mesh involves a few steps in my mind:

  1. Build basic mesh topology with desired IP scheme
  2. Enable OSPF between all routers
  3. Enable MPLS globally on all routers
  4. Enable MPLS on all interfaces within the topology

The first two steps are pretty straight forward, but the last two can be different in how they are handled. I came across this web page: http://www.cisco.com/c/en/us/td/docs/ios/12_0s/feature/guide/fsldpaut.html#wp1053058  This page showed me there are two ways to accomplish the task of enabling MPLS: separately on each interface or protocol wide for all OSPF interfaces.

The first way looks like this:

 R1#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
R2(config)#mpls ip
R2(config)#int e0/0
R2(config-if)#mpls ip
R2(config-if)#int e0/1
R2(config-if)#mpls ip
R2(config-if)#int e0/2
R2(config-if)#mpls ip

That is what you would do to enable MPLS globally on the router and on those three specific interfaces.

The other method allows you to enable MPLS on all interfaces that are being used within that specific OSPF process.

 R1#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
R1(config)#router ospf 1
R1(config-router)#mpls ldp autoconfig

Each method is valid and will ultimately accomplish the same thing. If you want to watch a video on this actually being implemented, I put a quick video together as well. Watch it below or directly on our YouTube Channel.

 

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