[AusNOG] AARNET and Aggregates

[Mark Prior]

Jonathan Thorpe wrote:

> At first, I thought it was just us (we advertise two /20s as a series of 
> /24s - e.g. 122.202.64.0/24 and 203.124.176.0/24 under AS37996 which are 
> aggregates of smaller prefixes), but looking at other peers that show up 
> over our Equinix link, others that also have aggregated routes seem to 
> experience the same phenomenon.
> 
> I've written to the AARNET NOC already, however I'm wondering if this 
> could be by design or simply a side effect?

It's probably by design. They use local pref to prefer certain paths, 
such as other research education networks, peers, over others 
irrespective of the AS path, etc. In this case you can see that they 
prefer Verizon Business over Optus even though the path is longer.

Mark.