--- title: Scaling EIGRP Networks with Stub Routers « ipSpace.net blog description: EIGRP stub routers, introduced in Cisco IOS 12.0(7)T, solve a critical scaling problem in hub-and-spoke WAN networks. Without stub configuration, every remote... canonical: https://daily.dev/posts/scaling-eigrp-networks-with-stub-routers-ipspace-net-blog-llsi7pkpb twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Scaling EIGRP Networks with Stub Routers « ipSpace.net blog | daily.dev og:description: EIGRP stub routers, introduced in Cisco IOS 12.0(7)T, solve a critical scaling problem in hub-and-spoke WAN networks. Without stub configuration, every remote... og:url: https://daily.dev/posts/scaling-eigrp-networks-with-stub-routers-ipspace-net-blog-llsi7pkpb og:image: https://api.daily.dev/og/posts/lLSI7PKpB.png og:image:alt: Scaling EIGRP Networks with Stub Routers « ipSpace.net blog og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Scaling EIGRP Networks with Stub Routers « ipSpace.net blog **[ipSpace.net Blog](https://daily.dev/sources/ipspace)** · 4 min read · 0 upvotes · 0 comments ## Summary EIGRP stub routers, introduced in Cisco IOS 12.0(7)T, solve a critical scaling problem in hub-and-spoke WAN networks. Without stub configuration, every remote office router gets queried during the DUAL process when any destination becomes unreachable, wasting bandwidth and risking Stuck-in-Active (SIA) events that can cause widespread network outages. Declaring remote routers as stubs prevents them from being queried during DUAL, improves convergence, and stops them from acting as transit routers. Configuration is simple — `eigrp stub connected` — and stub status is advertised via a TLV in EIGRP hello messages so neighbors automatically suppress queries to those peers. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### How do I configure an EIGRP stub router in Cisco IOS to prevent queries from being sent to remote office routers? Configure the remote router with `eigrp stub connected` under the EIGRP router process. This declares the router as a non-transit stub, causing neighbors to suppress DUAL queries to it and instead respond with an inaccessible (infinite) reply. The stub router advertises its status via a TLV in EIGRP hello messages, so any neighbor running IOS 12.0(7)T or later automatically stops querying it. _Network engineers tuning EIGRP convergence in hub-and-spoke designs track protocol details like these on daily.dev._ ### What causes Stuck-in-Active (SIA) events in EIGRP and how can stub routers prevent them? SIA events occur when a core router sends DUAL queries to all EIGRP neighbors and does not receive timely replies, causing it to drop the adjacency and potentially triggering a large-scale outage. In hub-and-spoke networks, remote office routers with no alternate paths are queried unnecessarily. Declaring them as stub routers stops core routers from querying them at all, eliminating the SIA risk from those peers. _Engineers managing large EIGRP networks find coverage of stability patterns like SIA prevention on daily.dev._ --- [View this post on daily.dev](https://daily.dev/posts/scaling-eigrp-networks-with-stub-routers-ipspace-net-blog-llsi7pkpb) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Scaling EIGRP Networks with Stub Routers « ipSpace.net blog","url":"https://daily.dev/posts/scaling-eigrp-networks-with-stub-routers-ipspace-net-blog-llsi7pkpb","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/scaling-eigrp-networks-with-stub-routers-ipspace-net-blog-llsi7pkpb"},"datePublished":"2026-08-11T08:54:59.604Z","dateModified":"2026-08-11T09:04:46.701Z","description":"EIGRP stub routers, introduced in Cisco IOS 12.0(7)T, solve a critical scaling problem in hub-and-spoke WAN networks. 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