The new Route Policy feature in Internet2 Insight Console Virtual Networks helps address this challenge. It provides network operators with the tools they need to secure, optimize, and configure their Border Gateway Protocol (BGP) routing infrastructure.
What is Virtual Networks Route Policy?
Route Policy allows network operators to define how BGP routes are handled. Think of it as a customizable filter and transformation engine sitting at the edge of your network, evaluating every route announcement and applying your organization’s networking logic before routes are accepted or advertised.
At its core, Route Policy uses a match-and-action model. You define conditions that routes must meet (the “match” criteria), then specify what should happen to routes that meet those conditions (the “action”).
This simple but flexible framework unlocks critical use cases that address real operational pain points: staying under provider route limits, blocking bad announcements before they spread, and ensuring BGP selects the paths you intend.
Use Case 1: Protecting BGP Peers from Max Prefix Limitations
Cloud providers impose strict limits on the number of routes they’ll accept over BGP sessions. Exceeding these thresholds can have immediate consequences.
Amazon Web Services, for example, limits BGP sessions on private virtual interfaces and transit virtual interfaces to 100 routes each for both IPv4 and IPv6. If you exceed this limit, AWS will place the BGP session in an idle state, effectively taking the connection down.
For organizations managing multicloud environments or large campus networks with numerous subnets, accidentally crossing this threshold is a real risk. Adding a new subnet or changing routing configuration could push you over the limit and cause an unexpected outage.
Route Policy provides prefix-limiting and filtering capabilities that act as a safeguard before routes reach your cloud provider. You can configure policies that only advertise specific, well-aggregated prefixes to each cloud provider while blocking more granular subnets, ensuring you stay well under their limits.
In multicloud scenarios, you might advertise different route sets to different providers based on their limits and your traffic engineering requirements. AWS might receive one set of aggregated routes, while Azure or Google Cloud receives another, each managed through distinct route policies.
Use Case 2: Improved Network Security and Route Leak Prevention
Route leaks — where networks accidentally advertise routes they shouldn’t — remain one of the most persistent threats to routing stability. A single misconfiguration can cause outages by attracting traffic that should flow elsewhere.
Route Policy acts as your first line of defense. By explicitly defining which routes each network will accept from peers and which routes you’ll advertise outbound, you create guardrails that prevent accidental route propagation.
For example, you might configure a policy that accepts only routes matching specific AS-path patterns from a particular peer, or one that prevents your internal prefixes from being advertised to certain connections.
This “allowlist” approach means that even if something goes wrong upstream or downstream, your carefully crafted policies keep problematic routes out of your routing table.
Use Case 3: Traffic Engineering with Attribute Modification
Not all paths through the network are created equal.
You might have multiple connections between cloud and campus, with some offering better performance, lower latency, or lower costs for certain types of traffic. Route Policy gives you the tools to influence path selection by modifying BGP attributes.
Through attribute modification, you can adjust metrics like local preference, AS path prepending, MED (Multi-Exit Discriminator), and BGP communities to steer traffic along your preferred paths. Perhaps you want to prefer one connection over another for traffic destined to a specific provider or campus, or you want a deterministic path and failover between connections. Route Policy lets you encode these traffic engineering decisions directly into your routing configuration, ensuring traffic flows according to your operational and business requirements rather than relying solely on BGP’s default best-path selection.
Getting Started
Internet2’s Route Policy feature is now available for Layer 3 connections using the Virtual Networks Cloud Router in Insight Console. The console interface provides an intuitive way to create and manage policies, with full documentation available to guide you through configuration options.
Whether you’re looking to improve your network security posture, implement traffic engineering, or protect your networks from route overload, Route Policy gives you the control and flexibility you need. As cloud connectivity continues to grow in complexity, tools like this become not just helpful — but essential.
If your institution uses Virtual Networks Cloud Router, now is the time to explore Route Policy, what it enables, and how you can use it to be most effective.
Ready to get started? Visit the Route Policy documentation for step-by-step guidance through all available configuration options. Then log in to Insight Console to configure your first policy today.
ICYMI