As you see in the thumbnail, that network diagram we are going to implement and follow various scenarios of  GLBP working in detail with packet flow. This is practical design on customer site connected to MPLS , devices and link are kept independent for Redundancy.  Generally 2 WAN Links are used however I tried with Tertiary link too.

Configuration of all PE and Routers are in the snapshot below. Since the study is on GLBP we can Pre-build the network with config and keep it ready.

PE Configuration:- 


Router Configuration:- 



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Author: Ramesh