Solved

BGP Routing Question

Posted on 2014-04-04
8
308 Views
Last Modified: 2014-04-07
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.
0
Comment
Question by:Gary Dewrell
  • 3
  • 2
  • 2
  • +1
8 Comments
 
LVL 6

Expert Comment

by:Hassan Besher
ID: 39979314
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.
0
 
LVL 57

Expert Comment

by:giltjr
ID: 39979501
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.
0
 
LVL 17

Expert Comment

by:pergr
ID: 39979728
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.
0
 
LVL 57

Expert Comment

by:giltjr
ID: 39979980
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.
0
Why You Should Analyze Threat Actor TTPs

After years of analyzing threat actor behavior, it’s become clear that at any given time there are specific tactics, techniques, and procedures (TTPs) that are particularly prevalent. By analyzing and understanding these TTPs, you can dramatically enhance your security program.

 
LVL 17

Expert Comment

by:pergr
ID: 39980014
Perhaps he can get a /24 from the parent company, and at then use also the same AS number.
0
 
LVL 12

Author Comment

by:Gary Dewrell
ID: 39980071
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?
0
 
LVL 17

Accepted Solution

by:
pergr earned 500 total points
ID: 39980115
Yes, /24 and larger networks are exchanged between ISPs globally.

You also need an AS number.
0
 
LVL 12

Author Comment

by:Gary Dewrell
ID: 39983268
Thanks Pergr. I will contact our parent company and see what I can do.
0

Featured Post

How your wiki can always stay up-to-date

Quip doubles as a “living” wiki and a project management tool that evolves with your organization. As you finish projects in Quip, the work remains, easily accessible to all team members, new and old.
- Increase transparency
- Onboard new hires faster
- Access from mobile/offline

Join & Write a Comment

I recently attended Cisco Live! in Las Vegas, a conference that boasted over 28,000 techies in attendance, and a week of hands-on learning hosted by a solid partner with which Concerto goes to market.  Every year, Cisco displays cutting-edge technol…
When it comes to security, there are always trade-offs between security and convenience/ease of administration. This article examines some of the main pros and cons of using key authentication vs password authentication for hosting an SFTP server.
After creating this article (http://www.experts-exchange.com/articles/23699/Setup-Mikrotik-routers-with-OSPF.html), I decided to make a video (no audio) to show you how to configure the routers and run some trace routes and pings between the 7 sites…
Here's a very brief overview of the methods PRTG Network Monitor (https://www.paessler.com/prtg) offers for monitoring bandwidth, to help you decide which methods you´d like to investigate in more detail.  The methods are covered in more detail in o…

706 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

20 Experts available now in Live!

Get 1:1 Help Now