Multihoming is the practice of connecting your company’s network and IT infrastructure to two or more providers via the Border Gateway Protocol (BGP), the primary routing protocol used on the internet. Why would you want to multi-home? Simply put, if you have a single-threaded connection and it goes down, you’ll be left high and dry with until that connection is repaired.

Multihoming brings increased stability to your network’s connectivity to the internet and redundancy at a physical level. However, there are a few requirements that must be met in order to multi-home your network.

Multihoming Requirements

In order to properly multi-home, your company must own an Autonomous System Number. ASNs are registered with Regional Internet Registries (RIR). For North America, the RIR is the American Registry of Internet Numbers (ARIN). In addition, your company must register for a block of IP addresses, no smaller than a /24. ARIN can provide those IP addresses, and many ISPs are also able to carve out some of their IP space. ARIN provided blocks can be kept while the registration is maintained, while ISP provided IP space is only usable while the relationship with that ISP is maintained.

Once these two conditions are met, your organization can configure BGP and announce your IP space to all providers you are connected to. This provides redundancy, allowing multiple paths to and from your network, and stability. If one provider’s connection goes down due to an outage or maintenance, you can still provide services to your customers and co-workers. A multi-homed network also gives you the ability to shape your traffic through announcing more specific prefixes.

Say your company owns a /23 (two /24s) you can announce the /23 to all of your connected providers and then announce a /24 to one provider. The services located in the /24 addressing will enter via the provider hearing the /24 announcement. This is beneficial to contain cost of utilization of your provider links.

Advanced Multihoming with Communities and Route Optimization

There are a couple more advanced techniques that maybe worth employing in a multihoming scenario if you’d like to further refine your traffic and/or manage your costs.

Many providers have a list of communities that help shape traffic. Typically, these communities will help shape traffic by manipulating how your prefixes are managed in the provider network, as well as how the prefixes get announced beyond your providers. This technique offers more finely tuned traffic shaping and link utilization for containing costs. For more information on how customer communities can be used, please refer to your provider’s BGP policies.

Route optimization has also gained popularity of the last few decades. INAP’s MIRO Controller, the tech behind our Performance IP^® solution, is one such device. Route optimization adds another layer of control that considers network performance to specific destinations across each provider. Route optimization typically manipulates BGP routes heard from your providers to prefer those with the best performance in terms of packet loss and latency. Route optimization solutions are also beneficial in managing each providers’ traffic utilization to keep costs to a minimum.

Next Steps

Are you ready to multi-home? Visit the ARIN website to take care the multihoming requirements, then reach out to a provider you want to become one leg of your multihoming strategy. Chat with us to learn more about INAP’s network services.

Colocation, cloud and network services are at the heart of keeping us connected and the economy moving during the COVID-19 pandemic. To sustain peak performance, these services rely on the tireless and difficult work undertaken by frontline data center engineers and technicians.

In the video below, INAP leadership shines the spotlight on our 100-plus essential data center workers, whose terrific performance enables our thousands of global customers to successfully operate their businesses through a period of immense challenge.

Please join us in thanking them!

At the outset of the pandemic, world governments classified certain sectors of the workforce as “essential” to the functioning of society. Along with healthcare, food service and transportation workers, data center employees were a fixture of these lists.

Due to the behind-the-scene nature of their jobs, however, the world’s data center professionals are arguably the unsung heroes of the COVID-19 crisis. From e-learning and online gaming to telemedicine and work-from-home video conferencing, life would grind to a halt if not for data center operations teams.

The pandemic necessitates these employees operate through less than ideal scenarios. On top of managing unprecedented surges in network demand, INAP’s data center operations team is navigating new policies and procedures implemented for their health and safety. This includes a “no access” that restricts colocation customers and non-essential vendors and contractors from entering our facilities. For a subset of our colocation customers, one result of this particular restriction has been an uptick in remote hands requests, wherein INAP technicians perform mission-critical maintenance to server and network hardware that’s normally the responsibility of the customer. It’s highlighted to our customers just how skilled our teams are at managing complex systems.

Across the board, the team’s performance has not wavered during the pandemic. In many cases, it’s exceeded expectations.

Our Los Angeles team, for instance, is staying on schedule with the first phase of a 1.8 MW expansion at our flagship facility in Redondo Beach, working carefully with contractors and utility companies all the while maintaining a live Tier 3 facility.

The team’s attitude sacrifice and performance each and every one of our employees has made during the pandemic remind us how essential they are year-round, not just in times of crisis. None of us could do what we do without them.