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The task needs us setting up load balancing to 70% and 30%. My setup was:

R4:

 glbp 0 ip 129.1.45.6
 glbp 0 priority 101
 glbp 0 preempt
 glbp 0 weighting 30
 glbp 0 load-balancing weighted

R5:

 glbp 0 ip 129.1.45.6
 glbp 0 weighting 70

The forwarder will be R4 due to the higher priority. Only R4 ever needs to pre-empt as if it's not there, R5 kicks in, if it is there it'll pre-empt. Load balancing is decided by the forwarder based on received weightings reported by each node. Thus R4 is the only one who needs load balancing command right? 

I've only briefly looked into this. My intention isn't to nit pick, but it's good to understand why you're putting the command in. If a command has no affect on anything, then why use it?

I may be wrong in the config, which will negate my entire argument. if so, let me know! :)

Hi Beefheadboy,

    Yes indeed the preeemption is needed only on the router with higher priority to preeempt on becoming the AVG. The second statement in the task, requires actually to use "weighted" load-balancing; if you do not configure it, default is "round-robin". You need the command on both routers, for the case when R5 is the AVG.

Regards