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Connect BGP + anycast subnetwork
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Connect BGP + anycast subnetwork

BGP + anycast subnet is a service for organizing access to your infrastructure from the Internet. Using BGP + anycast subnet allows you to assign a single IP address for equipment in different poolahs and different services.

The service is used to create a fault-tolerant architectural solution: if part of the equipment fails, the traffic will be distributed among the remaining.

Principle of operation⁠

To build network connectivity using BGP + anycast subnetwork, you need any equipment that supports the BGP dynamic routing protocol:

  • For dedicated servers, a firewall, a hosted router, or routing software deployed on the server;
  • VMware-based cloud — EDGE;
  • cloud servers — routing software deployed on the server.

When connecting between your BGP-enabled equipment and Selectel edge routers, BGP sessions are built from each pool for which you want to configure unified addressing. Two sessions are set up within a single pool, a primary and a backup session.

To build BGP sessions on your end, you use an IP address from the dedicated subnet of each pool that will act as a BGP neighbor.

Connect BGP + anycast subnetwork⁠

  1. Ensure that all equipment that will be used to establish connectivity supports the BGP protocol.

  2. Ensure that each of the pools where you want to use unified addressing has a dedicated public network with a free address. If necessary, order a subnet of the required size.

  3. Create a ticket to connect BGP + anycast subnet service. Specify in the ticket:

    • pools for which you need to configure unified addressing;
    • for each of the pools — an IP address from the dedicated subnet of that pool. These addresses will be used as BGP neighbor;
    • optional: if you have your own AS (autonomous system) — its number;
    • desired dimensionality of anycast subnetwork from /32 before /24.

  4. In the created ticket, wait for a Selectel employee to reply. He will clarify the details and give detailed instructions on how to further organize the connection.

An example of BGP connectivity using an anycast subnet through FortiGate firewalls is described in this blog article How to configure a redundant network scheme using BGP and anycast subnetwork protocols.