NetNotes

Getting started with MPLS, getting rid of BGP in the core

In this lab, we will do a very simple MPLS lab, to illustrate how we can have a network without BGP on the core transit routers in an AS.  Here’s how the simple network looks like:

The complete configurations are listed at the end of the post.

We will start with just 3 routers in our AS 65001:

RLeft:

Loopback0: 192.168.255.10/32  –> Management, routed in EIGRP
Loopback1: 192.168.10.1/24 –> Simulated LAN, routed in iBGP
Fa0/0: 172.16.0.1/30 –> Interconnection to RCentre0, routed in EIGRP

RCentre0:

Loopback0: 192.168.255.11/32 –> Management, routed in EIGPR
Fa0/0: 172.16.0.2/30 –> Interconnection to RLeft, routed in EIGRP
Fa0/1: 172.16.0.5/30 –> Interconnection to RRight, routed in EIGRP

RRight:

Loopback0: 192.168.255.12/32 –> Management, routed in EIGPR
Loopback1: 192.168.20.1/24 –> Simulated LAN, routed in iBGP
Fa0/0: 172.16.0.6/30 –> Interconnection to RCentre0, routed in EIGRP

We have already enabled EIGRP across our network, and we have routed only the loopbacks and interconnection subnets (to make sure we have our neighborships up). 

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Tags: MPLS