Latest / The Cloud Business Podcast with Fexingo: AWS, Azure, GCP, and Enterprise Infrastructure / Cloud Contracts Now Charge for VPC Peering Cross-Region Latency
Transcript
- Lucas: You know that moment when your monthly cloud bill arrives and there's a line item that you don't recognize? Something like 'Cross-Region Latency Overage Fee'? That is becoming a real thing now. Luna: I have definitely seen that on a few invoices lately. It's not huge yet, but it's there. Lucas: Right. And it's one of those contract clauses that sneaks in during the fine-print phase. The hyperscalers — AWS, Azure, GCP — they've all started including latency service-level agreements for VPC peering across regions. And if your traffic exceeds a certain latency threshold for more than a defined percentage of the month, you get charged a penalty. Luna: Wait — so the provider is charging you for bad performance? That feels backward. Lucas: It does. But the logic from their side is that if you're using cross-region peering, you're effectively consuming more backbone capacity, and if your application is sensitive enough to care about latency, they want you to either commit to reserved capacity or pay for the overhead. The latency SLA basically says: we guarantee a certain round-trip time, say 50 milliseconds between us-east-1 and eu-west-1. If we exceed that for more than 5 percent of the month, we credit you. But if you're the one causing the congestion — like if you're bursting traffic patterns — you pay a surcharge. Luna: So it's a two-sided SLA. They give you a credit if they're slow, but they fine you if you're the noisy neighbor. Lucas: Exactly. And the fine is not trivial. I've seen contracts where the latency overage fee is something like five cents per gigabyte of traffic that exceeds the threshold. For a company moving a petabyte a month across regions, that adds up fast. Luna: Five cents a gigabyte — that's fifty thousand dollars per petabyte. That's real money. Lucas: It is. And the tricky part is that these clauses are relatively new. Most of them started appearing in enterprise agreements in late 2025 and early 2026. So many organizations signed their three-year contracts in 2024 or early 2025, and they're only now getting hit with these fees. Luna: What triggered this shift? Was there a specific incident? Lucas: There's a well-known case from mid-2025 where a large gaming company had a global launch and their cross-region peering between AWS Oregon and Frankfurt got hammered. They were moving game state data and leaderboard updates. Latency spiked to over 200 milliseconds for about six hours during the peak. The provider ended up charging them something like 1.2 million dollars in latency overage fees for that month alone. That got a lot of attention in the FinOps community. Luna: Ouch. And I'm guessing the contract didn't have a cap on those charges? Lucas: No cap. And that's the big lesson — you need to negotiate a latency overage cap or an exclusion for burst events. Some providers will agree to exclude launch events or maintenance windows if you specify them in advance. Luna: So how do you audit your current exposure? If you're already on a contract, you can't change the terms, but you can at least know what you're facing. Lucas: Step one: check your peering topology. Most companies have a hub and spoke model where one region acts as the central hub. That hub region can become a bottleneck. Use tools like AWS VPC Reachability Analyzer or Azure Network Watcher to measure latency between all your peered pairs. Step two: look at your cloud provider's billing console for any line items with 'Latency' or 'Overage' in the description. They don't always surface those prominently. Luna: And step three: if you're about to sign a new contract, what language should you look for? Lucas: Three things. One: a cap on total latency overage charges, ideally as a percentage of your total monthly spend — say 2 percent. Two: an exclusion list for planned events like game launches, software updates, or data migrations. Three: a mutual SLA — meaning they credit you if they miss their latency target, but you only pay if you exceed a very high threshold, like 100 milliseconds for more than 10 percent of the month. Luna: That seems reasonable. But are the providers willing to negotiate? My sense is that cloud contracts have gotten more aggressive across the board. Lucas: They are willing, but only for large accounts. If you're spending under a million a year, you get standard terms. But if you're above that, you have leverage. The key is to have your network team model your traffic patterns before you go into negotiation. Show them: 'Look, we have these burst events that are unavoidable. We need an exclusion.' Data wins. Luna: It's interesting that this is happening at the same time as data egress charges are getting more granular. It feels like the providers are monetizing every edge of the network. Lucas: They are. And I think it's partly because the growth in compute and storage has slowed a bit — the hyperscalers are looking for new revenue streams. Latency overage is a perfect one because most companies don't have the tools to monitor it proactively. They only see the bill after the fact. Luna: So what can a FinOps team do today, right now, to start getting ahead of this? Lucas: Set up a latency budget. Just like you have a budget for compute and storage, create a budget for cross-region peering latency. Use cloud monitoring tools to alert when average latency crosses, say, 80 percent of your SLA threshold. That gives you time to optimize routing or shift traffic before you hit the overage window. Luna: And if you don't have the tooling? Smaller teams? Lucas: Start with a simple script that pings your peered endpoints every minute from a VM in each region. Log the results to a spreadsheet. It's manual but it works. And in your next contract renewal, ask for a free monitoring tool from the provider — some of them will give you a dashboard if you commit to a certain spend. Luna: Speaking of tools, a lot of the listeners of this show are exactly the people building and running these systems. And I know from talking to many of them that they rely on shows like this to stay ahead of these contract traps. Lucas: Yeah, and that's exactly why we do this. We keep the show ad-free because we want it to be a resource, not a commercial. And a couple of dollars a month from listeners who find it useful genuinely makes a difference — it's what keeps the episodes coming without sponsors calling the shots. Luna: If you've gotten something out of this episode, or the previous ninety-seven, you can support the show at buy me a coffee dot com slash fexingo. No pressure, just if it's added value for you. Lucas: And back to the topic — one more thing I want to mention. Some providers are now including 'latency utilization reports' as a standard part of their billing portal. AWS Cost Explorer, for example, has a new dimension called 'Network Performance' that shows you your average and P99 latency per peering connection. That's a huge help if you know where to look. Luna: So it's not all bad. The tools are catching up to the contract changes. Lucas: Exactly. And that's the pattern we see over and over in cloud infrastructure: the contract gets more complex, then the tooling gets better, and then the smart teams adapt. The ones who get caught are the ones who sign and forget. Luna: So the takeaway: audit your peering, negotiate your caps, and monitor your latency — before your next bill arrives. Lucas: Right. And if you do that, you can turn this from a cost risk into a negotiating lever. Because if you can show the provider you understand exactly where your traffic is and what it costs, you're in a much stronger position.