BGP Routing Question

At our corporate office we currently have a 60Mb connection to the internet through Time Warner.  For redundancy we are adding an additional 50MB connection through AT&T.

We have another location that is co-located in our parent companies datacenter. They already have multiple providers and currently use BGP.

Questions.
If I get a /24 block of IPs from ARIN is it possible for me to split that block up and BGP advertise a portion through Time Warner here at my corporate office and get a provider at my parent company to advertise the other portion.

What I want to get to is the ability to failover from my corporate office to the parent company and if need be from the parent company to the corporate office.
Ideally I would take the /24 I hope to get from ARIN and split it in half. Advertise half here at corp and the other half at the parent company datacenter.


Very new to BGP. Any advise would be greatly appreciated.
LVL 12
Gary DewrellSenior Network AdministratorAsked:
Who is Participating?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

x
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Hassan BesherCommented:
why you don't advertise /24 block and BGP peering will take care of failover, it will be slow but if there is bfd support it will be much faster.
giltjrCommented:
Well for many reasons spiltting up a /24 is not a good idea.

The biggest reason is the smallest subnet an ISP will advertise is a /24, so you're not going to be able to to split a /24 up and advertise it from two different sites.
pergrCommented:
Get a /24 (if ARIN still has addresses left) and advertise it to both your ISP, and to you parent company - and ask them to advertise it to their two uplinks.

Add a few prepends towards your parent company, so not much traffic will come on that link. The parent company itself can set higher local preference in order to use the link for traffic from themselves.

Take only default route from both your ISP, and parent company - plus ask parent company to advertise you also their own networks. Set higher local preference on the default you receive from your ISP.

With this you do not need to take the full table, so any cheap router or L3 switch can do the job. You will have fail over, not load balancing.
Big Business Goals? Which KPIs Will Help You

The most successful MSPs rely on metrics – known as key performance indicators (KPIs) – for making informed decisions that help their businesses thrive, rather than just survive. This eBook provides an overview of the most important KPIs used by top MSPs.

giltjrCommented:
He can't get  a /24 from ARIN, the small they will hand out is a /21.  If all he can justify is a /24, then it will have to come from one of his ISP's.
pergrCommented:
Perhaps he can get a /24 from the parent company, and at then use also the same AS number.
Gary DewrellSenior Network AdministratorAuthor Commented:
According to the policy on Arin's website an end user can get a /24.  An ISP has to get at least a /21.

If I can get a /24 one of my providers, is it it pretty standard that the other providers would advertise it for me?
pergrCommented:
Yes, /24 and larger networks are exchanged between ISPs globally.

You also need an AS number.

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
Gary DewrellSenior Network AdministratorAuthor Commented:
Thanks Pergr. I will contact our parent company and see what I can do.
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Routers

From novice to tech pro — start learning today.