--- title: "How we test OSPF and IS-IS: adjacency and SPF | TEST4NET" description: "OSPF and IS-IS on the CloudLAB bench: hundreds of emulated routers, LSA and LSP flooding at scale, SPF timing and the traffic gap after a link failure" image: https://test4net.com/hubfs/blog-covers/how-we-test-ospf-is-is.png --- [Skip to content](https://test4net.com/blog/how-we-test-ospf-is-is#main-content) [![TEST4NET](https://test4net.com/hubfs/test4net-logo-fixed-2.svg)](https://test4net.com/?hsLang=en) - Services - Products - Resources - Company - [English](https://test4net.com/blog/how-we-test-ospf-is-is) - [Русский](https://test4net.com/ru/blog/how-we-test-ospf-is-is) - [Հայերեն](https://test4net.com/hy/blog/how-we-test-ospf-is-is) [News](https://test4net.com/news?hsLang=en) [Login](https://lab.test4net.com) [Support](https://test4net.com/support?hsLang=en) - [English](https://test4net.com/blog/how-we-test-ospf-is-is) - [Русский](https://test4net.com/ru/blog/how-we-test-ospf-is-is) - [Հայերեն](https://test4net.com/hy/blog/how-we-test-ospf-is-is) What we test By technology Industries [Load & Performance Testing Throughput, sessions and latency up to and past the rated limit](https://test4net.com/services/load-performance-testing?hsLang=en) [Functional & Conformance Testing Features against the spec, RFC compliance with evidence](https://test4net.com/services/functional-conformance-testing?hsLang=en) [Interoperability Testing Multi-vendor behaviour, before it reaches production](https://test4net.com/services/interoperability-testing?hsLang=en) [Security & Resilience Testing NGFW, IPS and VPN efficacy and performance with threats on the wire](https://test4net.com/services/security-resilience-testing?hsLang=en) [Test Plan & Methodology Design What to test, how, and what counts as a pass](https://test4net.com/services/test-plan-design?hsLang=en) [Test Automation & CI/CD Regression suites wired into your release pipeline](https://test4net.com/services/test-automation?hsLang=en) [Training Programs Hands-on courses for your test engineers](https://test4net.com/services#training) [Equipment Repair Diagnostics and repair of test equipment](https://test4net.com/services#repair) [All services](https://test4net.com/services?hsLang=en) [Routing & Switching RFC 2544 and RFC 2889 on real ports, 1G to 100G](https://test4net.com/solutions/routing-switching?hsLang=en) [Firewalls & NGFW RFC 9411 throughput with inspection switched on](https://test4net.com/solutions/firewalls-ngfw?hsLang=en) [SD-WAN & WAN Path selection and QoS under emulated WAN conditions](https://test4net.com/solutions/sd-wan?hsLang=en) [Cloud & NFV Virtual appliances and cloud services under load](https://test4net.com/solutions/cloud-nfv?hsLang=en) [5G & Mobile Core Transport and core functions under subscriber traffic](https://test4net.com/solutions/5g-mobile-core?hsLang=en) [Wi-Fi Wi-Fi 6 clients and access points, Wi-Fi 7 in progress](https://test4net.com/solutions/wi-fi?hsLang=en) [Storage & Infrastructure Storage networks and servers under realistic I/O](https://test4net.com/solutions/storage?hsLang=en) [AI / Switching Fabric (RoCEv2) Lossless Ethernet for GPU clusters: PFC, ECN, fabric load](https://test4net.com/solutions/ai-fabric-rocev2?hsLang=en) [All technologies](https://test4net.com/services#coverage) [Telecom Operators Pre-deployment acceptance and vendor comparison](https://test4net.com/solutions/industries#telecom) [Network & Security Vendors Independent validation of your product claims](https://test4net.com/solutions/industries#vendors) [System Integrators Proof for the customer before the rollout](https://test4net.com/solutions/industries#integrators) [Enterprise & Banks Upgrades and new platforms checked before production](https://test4net.com/solutions/industries#enterprise) [All industries](https://test4net.com/solutions/industries?hsLang=en) Not sure where to start? 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The protocol is 30 years old and the implementations still differ by a factor of 10 in how quickly they do it. That factor shows up as the number of seconds your users lose packets after a fibre cut. ## The bench The device under test connects to the generator on 1G to 100G ports. The generator emulates the rest of the area: for OSPF, hundreds of routers with their LSAs, point-to-point and broadcast networks, stub and NSSA areas, OSPFv3 for IPv6; for IS-IS, level 1 and level 2 routers, wide metrics, multi-topology for IPv6, and the TLVs the segment routing design needs. The emulated topology can be a few hundred nodes with a few thousand prefixes, which is more than most enterprise networks and a fair slice of a service provider one. The DUT runs your timers, your authentication and your area design. If production uses a 50 ms hello and LFA, so does the test. ## What we check - Adjacency: 50, 200 and more neighbours brought up at once, the time until each is Full or Up, behaviour with MTU mismatch and authentication errors - Flooding: an LSA or LSP storm from one corner of the area, the time until the DUT has re-flooded it to the rest, and the CPU during the storm - SPF: a link cost change, a node failure and a prefix change, each timed from the trigger to the updated FIB; SPF throttle timers checked against the configured values - Convergence in traffic terms: the generator sends flows across the DUT and measures the gap in milliseconds for each flow when a link or a neighbour disappears - Fast reroute: LFA and TI-LFA coverage for each prefix, and the actual gap with FRR on versus off - Scale: LSDB with thousands of prefixes, memory over 24 hours, and a check that nothing is forgotten after a graceful restart - Interaction: OSPF or IS-IS redistributed into BGP and back, route tags, summarisation at area borders ## What usually breaks Adjacencies come up. The clock is the problem. A router with 300 neighbours and a 5,000-prefix LSDB has an SPF that takes 20 ms on paper and 800 ms on the box, because the FIB update after SPF is what takes the time, and the datasheet quotes only the SPF. Your traffic gap is the sum. A second typical case is flooding under load. A link flap on one side of the area causes a burst of LSAs; the DUT with the control plane already at 70% CPU from BFD and BGP delays re-flooding by seconds, and the far side of the area runs on stale information. In a lab with 5 routers this never happens. With 300 emulated ones it does. The third is fast reroute coverage. TI-LFA is on, the design assumes every prefix is protected, and a coverage check shows 15% of prefixes with no backup path because of a metric choice made years ago. The test lists them. ## What is in the report Adjacency and flooding times as tables. SPF and FIB update per event, with the throttle timers next to them. A convergence table per failure scenario: event, flows affected, gap in milliseconds, with and without FRR. The LFA coverage list. CPU and memory for the whole run, the DUT configuration and the emulated topology. The vendor gets enough to reproduce every item. ## Where to start Send us the device model, the firmware you plan to run and the topology it will sit in. We answer with a test plan: the items, the bench layout and the dates. The plan is free, the report is yours to keep and to show to the vendor. [Write to us](https://test4net.com/contacts?hsLang=en) or look at [what else the bench does](https://test4net.com/services?hsLang=en). Share Pass it on to someone who runs a network Independent lab data is most useful in the hands of the people who make the call. Send this piece to a colleague. [LinkedIn](https://www.linkedin.com/sharing/share-offsite/?url=https%3A%2F%2Ftest4net.com%2Fblog%2Fhow-we-test-ospf-is-is) [X](https://twitter.com/intent/tweet?url=https%3A%2F%2Ftest4net.com%2Fblog%2Fhow-we-test-ospf-is-is&text=How+we+test+OSPF+and+IS-IS%3A+adjacencies%2C+flooding+and+the+SPF+clock) [Telegram](https://t.me/share/url?url=https%3A%2F%2Ftest4net.com%2Fblog%2Fhow-we-test-ospf-is-is&text=How+we+test+OSPF+and+IS-IS%3A+adjacencies%2C+flooding+and+the+SPF+clock) [WhatsApp](https://wa.me/?text=How+we+test+OSPF+and+IS-IS%3A+adjacencies%2C+flooding+and+the+SPF+clock%20https%3A%2F%2Ftest4net.com%2Fblog%2Fhow-we-test-ospf-is-is) Copy link More apps ![](https://test4net.com/hubfs/IMG_0070.jpg) Written by ### [Alexander Zemskov](https://test4net.com/blog/author/az) Alexander Zemskov leads network and security testing at TEST4NET, an independent, vendor-neutral testing lab in Yerevan, Armenia. With 19+ years in performance and load testing on IXIA, Spirent, Keysight, Xena and Xinertel platforms, he runs NGFW, WAF, IPS, DLP and SASE evaluations for telecom operators, banks and system integrators. [LinkedIn](https://www.linkedin.com/in/azemskov/) [Website](https://test4net.com/?hsLang=en) [Previous article How we test BGP: 1M routes, a pulled link and a stopwatch](https://test4net.com/blog/how-we-test-bgp?hsLang=en) [Next article How we test MPLS and segment routing: label paths under a traffic load](https://test4net.com/blog/how-we-test-mpls-and-segment-routing?hsLang=en) In this article On the bench ### Have a device to put through this? Send us the shortlist and the KPIs that decide it. We will come back with a scoped test plan, a timeline and a fixed price. [Talk to a test engineer](https://test4net.com/contacts?hsLang=en) Blog ## Keep reading [![How we test Wi-Fi 6, 6E and 7: 200 clients, roaming and the TR-398 sheet](https://test4net.com/hs-fs/hubfs/blog-covers/how-we-test-wi-fi-6-6e-7.png?width=880&height=550&name=how-we-test-wi-fi-6-6e-7.png)](https://test4net.com/blog/how-we-test-wi-fi-6-6e-7?hsLang=en) [Standards and methodology](https://test4net.com/blog/tag/standards-and-methodology) [Protocols](https://test4net.com/blog/tag/protocols) ### [How we test Wi-Fi 6, 6E and 7: 200 clients, roaming and the TR-398 sheet](https://test4net.com/blog/how-we-test-wi-fi-6-6e-7?hsLang=en) Every access point datasheet carries a PHY rate: 5.4 Gbit/s, 11 Gbit/s, 46 Gbit/s for Wi-Fi 7. The number is the modulation table. What a client gets in a meeting room wi… ![](https://test4net.com/hs-fs/hubfs/IMG_0070.jpg?width=22&height=22&name=IMG_0070.jpg) Alexander Zemskov Oct 28, 2026 · 4 min read [![How we test TLS and HTTPS: handshakes per second with inspection switched on](https://test4net.com/hs-fs/hubfs/blog-covers/how-we-test-tls-and-https.png?width=880&height=550&name=how-we-test-tls-and-https.png)](https://test4net.com/blog/how-we-test-tls-and-https?hsLang=en) [Standards and methodology](https://test4net.com/blog/tag/standards-and-methodology) [Protocols](https://test4net.com/blog/tag/protocols) ### [How we test TLS and HTTPS: handshakes per second with inspection switched on](https://test4net.com/blog/how-we-test-tls-and-https?hsLang=en) The datasheet of a firewall or a load balancer states "TLS throughput". The footnote, when there is one, says TLS 1.2, RSA 2048, one cipher, 64 KB objects, inspection off… ![](https://test4net.com/hs-fs/hubfs/IMG_0070.jpg?width=22&height=22&name=IMG_0070.jpg) Alexander Zemskov Oct 28, 2026 · 4 min read [![How we test EVPN and VXLAN: a fabric leaf under thousands of hosts](https://test4net.com/hs-fs/hubfs/blog-covers/how-we-test-evpn-vxlan.png?width=880&height=550&name=how-we-test-evpn-vxlan.png)](https://test4net.com/blog/how-we-test-evpn-vxlan?hsLang=en) [Standards and methodology](https://test4net.com/blog/tag/standards-and-methodology) [Protocols](https://test4net.com/blog/tag/protocols) ### [How we test EVPN and VXLAN: a fabric leaf under thousands of hosts](https://test4net.com/blog/how-we-test-evpn-vxlan?hsLang=en) A data centre fabric is accepted in 2 steps. Step 1: the integrator shows that two hosts on different leaves can ping. Step 2 happens 6 months later, when a hypervisor mi… ![](https://test4net.com/hs-fs/hubfs/IMG_0070.jpg?width=22&height=22&name=IMG_0070.jpg) Alexander Zemskov Oct 28, 2026 · 4 min read [![TEST4NET LLC](https://test4net.com/hubfs/test4net-logo-fixed.svg)](https://test4net.com?hsLang=en) Independent testing and validation for telecom, information security and cloud infrastructure – real insights, not assumptions [mailto:sales@test4net.com](mailto:sales@test4net.com) #### Navigate - [Home](https://test4net.com/?hsLang=en) - [Why TEST4NET](https://test4net.com/why-test4net?hsLang=en) - [About us](https://test4net.com/about?hsLang=en) - [Contact](https://test4net.com/contacts?hsLang=en) - [Blog](https://test4net.com/blog?hsLang=en) - [Industry News](https://test4net.com/news?hsLang=en) #### Get in touch Sales [sales@test4net.com](mailto:sales@test4net.com) Support [support.test4net.com](https://support.test4net.com) © 2026 TEST4NET LLC. All rights reserved. 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