<p>Ncell QnQ Connectivity L2 is a secure, carrier-grade service that lets you extend your existing VLANs across different sites using VLAN stacking (QinQ). It&rsquo;s designed for enterprises and service providers that need clear separation of traffic, predictable performance, and reliable Ethernet transport with SLA-backed assurance&mdash;all without the complexity of Layer-3 or MPLS networks.</p>

<h2>What is Ncell QnQ Connectivity L2?</h2>

<p>Ncell QnQ Connectivity L2 gives you carrier-grade Layer-2 transport that stacks many customer VLANs (C-VLANs) inside a single service VLAN (S-VLAN) across Ncell&rsquo;s backbone.</p>

<p>&bull; What it solves: Stop renumbering wars and duct-tape circuits. Keep staff, POS, CCTV, guest Wi-Fi, and IoT hard-isolated at Layer-2 without jumping to L3/MPLS.<br />
&bull; Deterministic by design: SLA-tracked latency/jitter/loss, MAC transparency, and jumbo-frame support for storage/replication flows.<br />
&bull; Service shapes: MEF-aligned E-Line/EVPL for point-to-point or hub-and-spoke (optional E-LAN/E-Tree where feasible); multiple EVCs per port to carry many services over one tail.<br />
&bull; Control &amp; assurance: Per-EVC CoS (voice/data/transactions), CIR/EIR policing, storm control; Ethernet OAM (CFM/Y.1731) for continuity, delay/jitter/loss, and fast fault isolation.<br />
&bull; Resilience patterns: Dual-port/dual-PoP handoffs, diverse paths, and clear maintenance/change workflows.<br />
&bull; Where it fits: ISP wholesale/NNI aggregation, retail chains with central internet breakout, DC&harr;DR L2 stretch, SCADA/OT segmentation, and education/healthcare campuses.<br />
&bull; Outcome: Cost-efficient scaling and audit-ready separation&mdash;add EVCs, CoS, or bandwidth instead of pulling new circuits.</p>

<h2>Who is QnQ Connectivity L2 For?</h2>

<p>&bull; ISPs and WISPs needing wholesale/NNI backhaul<br />
&bull; Data centers/hosts and multi-tenant campuses<br />
&bull; Large enterprises, retail chains, BFSI, healthcare, government, and research networks with segmented L2 needs<br />
&bull; Managed service providers delivering voice/Wi-Fi/IoT overlays</p>

<h2>What Are The Key Business Challenges Addressed?</h2>

<p>&bull; Carrying many customer/service VLANs on a single access tail<br />
&bull; Overlapping VLAN IDs across sites/tenants<br />
&bull; Strict separation of traffic types at Layer-2 (staff, POS, CCTV, guest, IoT)<br />
&bull; Predictable latency/jitter/packet-loss with uptime guarantees<br />
&bull; Avoiding Layer-3 complexity while keeping control of your own routing domains</p>

<h2>What Are The Core Features &amp; Technical Specs?</h2>

<p>&bull; QinQ VLAN stacking (802.1ad) &ndash; Encapsulate customer VLANs (C-VLANs) inside a service VLAN (S-VLAN). Support for multiple levels of QinQ as standard (design-dependent).<br />
&bull; VLAN transparency &amp; mapping &ndash; Preserve inner tags end-to-end; map/translate tags per site to interoperate with legacy edges. Multiple EVCs on one port; double-tagged NNI options common in carrier Ethernet.<br />
&bull; Service types (MEF-aligned) &ndash; E-Line / EVPL (point-to-point &amp; hub-and-spoke) for branch&harr;DC and multi-site designs. Optional E-LAN/E-Tree variants where feasible for multi-point or rooted topologies.<br />
&bull; Classes of Service (CoS) &amp; QoS &ndash; Prioritize voice/video/transaction traffic with per-EVC CoS; CIR/EIR policing and shaping. Tiered CoS models to match application SLOs.<br />
&bull; OAM &amp; performance monitoring &ndash; Ethernet OAM (CFM/Y.1731) for continuity checks, loopback, path delay/jitter/loss measurement; fault isolation and SLA reporting.<br />
&bull; MTU &amp; Layer-2 transparency &ndash; Jumbo-frame support (subject to access), MAC transparency, configurable STP BPDU handling.<br />
&bull; Interfaces &amp; bandwidth &ndash; Carrier-Ethernet handoffs at 1G/10G/100G; scalable commits and burst options.<br />
&bull; Resilience options &ndash; Dual-port / dual-PoP handoffs, path diversity, rapid failover; planned maintenance windows.<br />
&bull; Security hygiene &ndash; Hard L2 separation by S-VLAN, storm control, broadcast/unknown-unicast/multicast controls, optional MAC limiting.<br />
&bull; Operations &amp; visibility &ndash; 24&times;7 NOC; portal/API for utilization and KPIs; ticketing and change workflows.</p>

<h2>What Are The Business Benefits?</h2>

<p>&bull; Many VLANs, one tail &ndash; Tunnel multiple services/tenants per site without new circuits; scale by EVC/CoS/bandwidth.<br />
&bull; Clean separation &ndash; QinQ enforces per-service isolation at L2; keep customer domains distinct and auditable.<br />
&bull; Deterministic performance &ndash; SLA-tracked latency/jitter/loss keeps real-time apps and payments stable.<br />
&bull; Cost-efficient scaling &ndash; Add EVCs, upgrade commits, or expand CoS without re-cabling.<br />
&bull; Design flexibility &ndash; Mix point-to-point and hub-and-spoke; retain your own L3/VRF strategy above the L2 service.</p>

<h2>What Are The Applications?</h2>

<p><strong>For internet service providers</strong><br />
An ISP that used to juggle hundreds of customer networks no longer struggles with overlapping IDs or messy setups. With Ncell QnQ, all customer VLANs are stacked neatly inside one clean system. New customers are added quickly without pulling new lines. Voice calls get priority, card payments get stable lanes, and guest Wi-Fi is kept under control so it doesn&rsquo;t slow everything down. The ISP now has proof of performance with clear reports, making conversations with finance and audits much smoother.</p>

<p><strong>For nationwide retail chains</strong><br />
A retailer with stores across Nepal keeps all branch traffic separate&mdash;staff Wi-Fi, POS, CCTV, and guest access&mdash;while sending it back to headquarters over one simple connection. Nothing mixes on the way, and the head office security systems see every packet in the right place. When festival sales bring in heavy traffic, priority rules keep payments fast, storm control stops noisy guests from overwhelming the line, and adding a new store is just a quick configuration, not a big project.</p>

<p><strong>For growing enterprises with multiple offices</strong><br />
A company with branches in several cities connects them all securely using Ncell QnQ. Each type of traffic&mdash;business apps, guest Wi-Fi, video calls&mdash;is kept in its own lane. Performance stays predictable, security teams are satisfied because traffic separation is provable, and IT doesn&rsquo;t waste weeks setting up new links. When the business expands to a new location, it&rsquo;s as simple as applying a template instead of starting from scratch.</p>

<p><strong>Want to know more about the Ncell QnQ Connectivity L2? Request a callback now for personalized assistance!</strong><br />
<u><a href="https://www.ncell.com.np/en/business/request-a-call-back" target="_blank">Click here to request a call back</a></u></p>

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Ncell QnQ Connectivity L2 (Layer-2 Ethernet with QinQ)