Set as-path prepend last-as doesn't work ?

I'm trying to use this statement on a route-map to an IBGP peer in order to make a particular AS-PATH to appear longer but it doesn't seem to be working.
Here's my route-map, which is applied inbound from the neighbor I want to pad. It seems so logical yet it isn't working.
Any ideas would be welcomed.
= K
route-map Groom_Cogent permit 100
match as-path 174
set as-path prepend last-as 2
ip as-path access-list 174 permit ^174_

If you look at the BGP decision process:
http://www.cisco.com/en/US/tech/tk365/tk80/technologies_tech_note09186a0080094431.shtml#bestpath
You'll see that one of the steps is the IGP metric (step 8). So, if all other factors are equal up to the IGP metric, and it sounds like they are, as long as the IGP cost to reach the next hop along one path is shorter in one direction, that direction will be chosen. It seems to me that setting the IGP metrics so the one path is chosen over the other one is the thing to do here, if you don't want to use local pref.
It's also possible to use a cost community within your AS to inject a new "cost" into the decision algorithm.
http://www.cisco.com/en/US/products/sw/iosswrel/ps1829/products_feature_guide09186a00801bbad4.html
The current insertion point is just after the IGP metric, which sounds perfect for what you are doing, if the IGP metrics are all the same.
Hope that helps...
Russ

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