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Reviewed 2 November 2026. Check Cisco’s current exam information before booking. Reading paths are study groupings and do not represent official exam weights.
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Choose a platform to explore 50 guides, from a first task brief to reusable workflows. Microsoft Copilot guides cover the consumer and Microsoft 365 experiences; in-app features depend on your account and license.
Results for “reading-path:evpn-vxlan-data-center-fabrics”
Network & Infrastructure
A remote MAC appears in BGP EVPN while unicast packets never reach the destination host. Control-plane learning can succeed even when VTEP-to-VTEP forwarding is broken.
Read article : EVPN Type-2 routes present, VXLAN traffic absentNetwork & Infrastructure
Two leaf switches advertise the same tenant's endpoints, but each ignores the other's routes. Matching VLAN names can obscure different VNI or route-target assignments.
Read article : VNI and route-target mismatch across a tenant fabricNetwork & Infrastructure
An operator changes a route distinguisher to fix an import problem. The change churns advertisements while the receiving tenant still lacks the route because import policy remains wrong.
Read article : Route distinguisher versus route target in EVPN troubleshootingNetwork & Infrastructure
Known unicast works across the fabric, but a new host cannot resolve its neighbor or receive broadcast traffic. Missing replication membership can affect discovery before any remote MAC is learned.
Read article : Missing EVPN Type-3 routes and silent BUM lossNetwork & Infrastructure
A moved workload remains unreachable even though its new MAC location is known. A stale advertised IP binding can make local ARP suppression answer with outdated information.
Read article : EVPN ARP suppression with stale IP-to-MAC bindingsNetwork & Infrastructure
An endpoint alternates between two VTEPs faster than a legitimate migration could explain. Increasing mobility sequences can reflect a loop or duplicated attachment rather than an actively moving VM.
Read article : MAC mobility sequence jumps and a hidden Layer-2 loopNetwork & Infrastructure
A tenant works on one rack but fails after moving to another. The distributed gateway IP exists everywhere, yet gateway MAC or subnet configuration differs between leaf switches.
Read article : Distributed anycast gateway consistency across leavesNetwork & Infrastructure
Same-subnet communication succeeds across the overlay, while inter-subnet traffic fails only through one destination leaf. Its L2 VNIs may be correct but the routed tenant context incomplete.
Read article : Symmetric IRB: diagnose a missing L3 VNI on one leafNetwork & Infrastructure
A leaf can route to one remote subnet but not another after tenant growth. The chosen asymmetric design may require local bridge context for remote destination subnets that was never provisioned.
Read article : Asymmetric IRB and the cost of remote subnet presenceNetwork & Infrastructure
An external prefix is visible as an EVPN Type-5 route but is not usable in the tenant VRF. Its overlay resolution model may depend on additional gateway or router information.
Read article : EVPN Type-5 prefix routes and overlay next-hop resolutionNetwork & Infrastructure
A fabric has several equal-cost uplinks, yet one is congested while others are quiet. Encapsulated traffic may expose insufficient entropy to the underlay's hashing algorithm.
Read article : VXLAN underlay ECMP polarization despite many tenant flowsNetwork & Infrastructure
Small overlay packets succeed while larger application responses fail between racks. The underlay may not accommodate the tenant packet plus outer encapsulation and link-specific overhead.
Read article : VXLAN encapsulation MTU and selective tenant packet lossOur original short guides to AI, account protection, and recovery.