--- title: VXLAN-to-VXLAN Bridging in DCI Environments «... description: VXLAN-to-VXLAN bridging solves two key problems when extending VXLAN/EVPN across WAN links in DCI environments: excessive ingress replication flooding WAN... canonical: https://daily.dev/posts/vxlan-to-vxlan-bridging-in-dci-environments-ipspace-net-blog-gl0t33lhh twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: VXLAN-to-VXLAN Bridging in DCI Environments « ipSpace.net blog | daily.dev og:description: VXLAN-to-VXLAN bridging solves two key problems when extending VXLAN/EVPN across WAN links in DCI environments: excessive ingress replication flooding WAN... og:url: https://daily.dev/posts/vxlan-to-vxlan-bridging-in-dci-environments-ipspace-net-blog-gl0t33lhh og:image: https://api.daily.dev/og/posts/GL0t33lhh.png og:image:alt: VXLAN-to-VXLAN Bridging in DCI Environments « 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. # VXLAN-to-VXLAN Bridging in DCI Environments « ipSpace.net blog **[ipSpace.net Blog](https://daily.dev/sources/ipspace)** · 4 min read · 0 upvotes · 0 comments ## Summary VXLAN-to-VXLAN bridging solves two key problems when extending VXLAN/EVPN across WAN links in DCI environments: excessive ingress replication flooding WAN bandwidth, and ASIC limits on VXLAN neighbor and replication list entries. WAN edge switches act as VTEP boundaries for both LAN and WAN domains, receiving a single flooded copy and forwarding it appropriately. This requires split-horizon forwarding and flooding based on source IP, not VNI. For years only Cisco's Cloud Scale ASIC supported this, but Arista solved it on Broadcom Jericho, and the 2022 EANTC test report confirms it also works on Juniper QFX10K and Nokia 7750 SR-1. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### Which ASICs or platforms support VXLAN-to-VXLAN bridging for multi-site DCI? Cisco's Cloud Scale ASIC was long the only option for VXLAN-to-VXLAN bridging. Arista later implemented it on the Broadcom Jericho chipset, and the 2022 EANTC interoperability test report confirmed the feature also works on Juniper QFX10K and Nokia 7750 SR-1. Split-horizon forwarding and flooding based on source IP address — not VNI — are required from the switching ASIC. _Network engineers evaluating multi-site VXLAN platforms track hardware support updates like these on daily.dev._ ### Why does VXLAN ingress replication cause problems over WAN links in multi-site deployments? With ingress replication, every ToR switch sends a separate copy of each flooded packet to every remote ToR switch across the WAN link. This multiplies WAN bandwidth consumption proportionally to the number of remote VTEPs. Switching ASICs also impose hard limits — typically 256 VXLAN neighbors and 128 ingress replication list entries — which can be exhausted in large multi-site deployments. _Architects sizing WAN links for VXLAN fabrics find relevant design discussions on daily.dev._ ## Similar posts on daily.dev - [vPC and ESI-based multi-homing: The dynamic duo powering scalable, resilient data centers](https://daily.dev/posts/vpc-and-esi-based-multi-homing-the-dynamic-duo-powering-scalable-resilient-data-centers-wczyimyyo) · Cisco · 0 upvotes · 0 comments --- [View this post on daily.dev](https://daily.dev/posts/vxlan-to-vxlan-bridging-in-dci-environments-ipspace-net-blog-gl0t33lhh) ```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":"VXLAN-to-VXLAN Bridging in DCI Environments « ipSpace.net blog","url":"https://daily.dev/posts/vxlan-to-vxlan-bridging-in-dci-environments-ipspace-net-blog-gl0t33lhh","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/vxlan-to-vxlan-bridging-in-dci-environments-ipspace-net-blog-gl0t33lhh"},"datePublished":"2026-08-11T08:52:10.637Z","dateModified":"2026-08-11T09:01:59.592Z","description":"VXLAN-to-VXLAN bridging solves two key problems when extending VXLAN/EVPN across WAN links in DCI environments: excessive ingress replication flooding WAN...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/71ccda964171e72db336f747fc06bf0f?_a=AQAEuop","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/71ccda964171e72db336f747fc06bf0f?_a=AQAEuop","isAccessibleForFree":true,"articleSection":"ipSpace.net Blog","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"ipSpace.net Blog","logo":"https://media.daily.dev/image/upload/s--xS7E82MT--/f_auto,q_auto/v1786438303/logos/ipspace?_a=BAMAMicg0","url":"https://daily.dev/sources/ipspace"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/vxlan-to-vxlan-bridging-in-dci-environments-ipspace-net-blog-gl0t33lhh","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"","timeRequired":"PT4M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"ipSpace.net Blog","item":"https://daily.dev/sources/ipspace"},{"@type":"ListItem","position":3,"name":"VXLAN-to-VXLAN Bridging in DCI Environments « ipSpace.net blog"}]} {"@context":"https://schema.org","@type":"FAQPage","@id":"https://daily.dev/posts/vxlan-to-vxlan-bridging-in-dci-environments-ipspace-net-blog-gl0t33lhh#faq","mainEntity":[{"@type":"Question","name":"Which ASICs or platforms support VXLAN-to-VXLAN bridging for multi-site DCI?","acceptedAnswer":{"@type":"Answer","text":"Cisco's Cloud Scale ASIC was long the only option for VXLAN-to-VXLAN bridging. 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