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Leaf-Spine vs Three-Tier: Choosing a Data Center Design

Leaf-Spine vs Three-Tier: Choosing a Data Center Design

Two-tier spine-leaf and three-tier core-aggregation-access compared on latency, convergence, cabling cost and oversubscription for east-west traffic.

admin admin 2026-10-12
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Juniper Q-in-Q VLAN Stacking Configuration Guide

Juniper Q-in-Q VLAN Stacking Configuration Guide

Configure Juniper Q-in-Q (dot1q-tunneling) VLAN stacking on EX and QFX: S-VLAN mapping, all-in-one vs many-to-one bundling, verification.

admin admin 2026-10-09
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Leaf-Spine vs Three-Tier: Oversubscription and ECMP Design

Leaf-Spine vs Three-Tier: Oversubscription and ECMP Design

Compare leaf-spine and three-tier data center designs on oversubscription, ECMP bandwidth use and scale-out, with the ratios engineers should target.

admin admin 2026-10-03
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Azure ExpressRoute: Circuits, Private Peering and BGP

Azure ExpressRoute: Circuits, Private Peering and BGP

Configure Azure ExpressRoute private peering with BGP: circuit creation, /30 peer subnets, MD5 keys, route advertisement limits and failover testing.

admin admin 2026-09-27
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AWS Transit Gateway: Attachments and Route Tables

AWS Transit Gateway: Attachments and Route Tables

Design AWS Transit Gateway correctly: attachment subnets, propagate versus static routes, segmentation with multiple TGW route tables and shared VPCs.

admin admin 2026-09-27
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Cisco Nexus 9300 vs 9500: Leaf and Spine Selection

Cisco Nexus 9300 vs 9500: Leaf and Spine Selection

Fixed 1RU leaves or modular chassis spines? How to choose between Cisco Nexus 9300 and 9500 using oversubscription, uplink speed, buffers and redundan

admin admin 2026-09-26
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Spine-Leaf vs Three-Tier: STP Blocking and Bandwidth

Spine-Leaf vs Three-Tier: STP Blocking and Bandwidth

Three-tier networks block redundant links in spanning tree, so half the cabling carries no traffic. Quantify the bandwidth, hop-count and failure gap.

admin admin 2026-09-13
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EVPN Multihoming vs MLAG: ESI, DF Election and Clos

EVPN Multihoming vs MLAG: ESI, DF Election and Clos

EVPN multihoming with ESI and DF election versus MLAG: compare peer links, BUM handling, aliasing and failure modes before you choose.

admin admin 2026-09-13
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Leaf-Spine vs Traditional Three-Tier Topology Compared

Leaf-Spine vs Traditional Three-Tier Topology Compared

Compare leaf-spine vs traditional three-tier data centers and pick a topology using a scale, cost and operations selection matrix with worked examples

admin admin 2026-09-08
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BGP Route Reflector cluster-id: Configuration Guide

BGP Route Reflector cluster-id: Configuration Guide

BGP route reflector cluster-id guide: client roles, IOS config, why redundant RRs share one cluster-id and CLUSTER_LIST loop prevention.

admin admin 2026-09-07
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