[AusNOG] Going Dual Homed (without waste)

[Mark Tees]

Sorry, I should have mentioned - inbound is slightly black magic as there are a number of factors that effect the path people choose to get to you. AS path length, localised load balancing, agreements yada yada yada

On 26/09/2013, at 6:14 PM, Mark Tees <mark.tees at digitalpacific.com.au> wrote:

> Hey James,
> 
> Outbound is pretty easy. Check flow data to see which AS's make up your destination traffic or take a punt. Then use BGP local pref to send traffic down the desired BGP session.
> 
> Inbound, can sometimes be influenced by reasonable prepending and adding BGP communities that correspond to local preference in your upstream providers network. This depends on your upstreams.
> 
> Commercially, Nth percentile will give you the best bang for buck usually in that scenario.
> 
> 
> On 26/09/2013, at 5:52 PM, James Mcintosh <james.mcintosh at rocketmail.com> wrote:
> 
>> Hi Noggers,
>> 
>> Somewhat of a follow on from my previous post. I got a lot of comments back saying we should be muti-homed rather than single homed as we currently are.
>> 
>> I agree, however my question is how do we do so without over-provisioning transit and having too much "waste". If we're currently pumping around 600Mbps of inbound traffic through a single transit provider, how would we equally balance that across two transit providers at 300Mbs each.
>> 
>> Sure we could advertise some of our IP blocks via transit provider A and other IP blocks via transit provider B but that is hardly my idea of an easy load balancing solution and the traffic levels could still vary dramatically depending on downstream activities.
>> 
>> Your comments and ideas are much appreciated.
>> 
>> 
>> -James
>> 
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