SD-WAN
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TLOC Extension: Sharing Transports Between Edge Routers
A dual-router branch has an obvious problem: you have two WAN Edge routers for redundancy, but you may only
SD-WAN
Software-Defined WAN, the overlay-based architecture replacing traditional hub-and-spoke MPLS in enterprise networks. Articles tagged SD-WAN cover architecture, Cisco Catalyst SD-WAN (Viptela), SASE convergence, deployment models, and day-2 operational realities.
Latest
SD-WAN
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Direct Internet Access (DIA) in Catalyst SD-WAN
For years, branch internet traffic took a ridiculous journey: from the branch, across the WAN, to a central data centre,
SD-WAN
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SD-WAN Localized Policy: ACLs and Route Policies at the Edge
Centralised policy shapes the whole overlay from the Controller. But some things belong on the device itself - the ACL on
SD-WAN
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SD-WAN Data Policy and Application-Aware Routing (AAR)
This is the feature people actually buy SD-WAN for. Application-aware routing (AAR) measures the real-time quality of
SD-WAN
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SD-WAN Centralized Control Policy: Shaping the Overlay
Here is the thing that makes SD-WAN fundamentally different from a traditional WAN: you do not configure routing policy
SD-WAN
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OMP Deep Dive: Routes, TLOCs, Service Routes, and Path Selection
OMP is to Catalyst SD-WAN what BGP is to the internet: the one protocol that carries everything. Routes, next-
SD-WAN
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Catalyst SD-WAN Templates: Device, Feature, and CLI Templates Compared
The first thing that trips people up in Catalyst SD-WAN is not OMP or TLOCs or policy - it is
MPLS
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MPLS and DMVPN Together: Choosing and Combining Enterprise Transports
Almost every mid-to-large enterprise WAN ends up running both MPLS and DMVPN. Not because someone planned it that
SD-WAN Manager (vManage) API: Monitoring Catalyst SD-WAN Programmatically
If Catalyst Center is the controller for the campus, SD-WAN Manager (formerly vManage) is the controller for the WAN.
SD-WAN
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SD-WAN Routing Explained: Underlay, Overlay, and OMP
SD-WAN routing confuses people because there are really two routing problems happening at once, and they are easy to
SD-WAN
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Cisco Catalyst SD-WAN: The Rebrand, the Architecture, OMP
Cisco Catalyst SD-WAN (formerly Viptela / Cisco SD-WAN): the naming history, the four-plane architecture, OMP routing, and the zero-touch edge onboarding flow.
MPLS
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MPLS L3VPN vs SD-WAN: When to Migrate
A decision framework for migrating from MPLS L3VPN to SD-WAN: what's different, when to migrate, the 7-step transition that works, and when the right answer is to stay.