Ping Labz (Page 4)

SD-WAN Architecture: Control, Data, and Management Planes Explained

Every SD-WAN platform shares the same three-plane architecture: management, control, and data. The vendor-specific components (vManage, vSmart, FortiManager, etc.) compared.

6 min read Apr 25, 2026

SD-WAN public

SD-WAN vs MPLS: When Each Wins in 2026

J

SD-WAN and MPLS are not pure substitutes. The technical differences, cost story without the marketing spin, when MPLS still wins, and the hybrid pattern most enterprises end up with.

6 min read Apr 25, 2026

BGP public

MP-BGP: Multiprotocol BGP Address Families Explained

J

MP-BGP (RFC 4760) is what lets a single BGP session carry IPv6, VPNv4, EVPN, and more. The AFI/SAFI model, route distinguishers, and how modern data center fabrics use MP-BGP for everything.

6 min read Apr 25, 2026

STP public

STP vs RSTP: Convergence, Port Roles, and When to Switch

J

Classic 802.1D STP vs 802.1w RSTP. The convergence differences (30s vs sub-second), the port state and role changes, and the one-command Cisco migration from PVST+ to Rapid PVST+.

5 min read Apr 25, 2026

BGP public

BGP Neighbor States: The 6-State FSM and How to Diagnose It

J

BGP's finite state machine has six states: Idle, Connect, Active, OpenSent, OpenConfirm, Established. What each means, why Active is a problem state, and the diagnostic that maps each stuck state to a real cause.

6 min read Apr 25, 2026

VLAN public

Tagged vs Untagged VLANs: How Trunks and Access Ports Really Work

J

Tagged and untagged frames are the half of every VLAN problem nobody explains clearly. The mental model, when each is correct, the native VLAN, and the cross-vendor (Cisco / Aruba / Juniper) cheat sheet.

7 min read Apr 25, 2026

VLAN public

VLAN Hopping Attacks Explained: Switch Spoofing and Double Tagging

J

VLAN hopping bypasses Layer 2 isolation. The two attacks (switch spoofing via DTP, double tagging via the native VLAN) and the four-line Cisco configuration that defeats both.

7 min read Apr 25, 2026

VLAN public

802.1Q VLAN Tag Explained: The 4 Bytes That Make Trunking Work

J

The 802.1Q VLAN tag is 4 bytes inserted into Ethernet frames to carry VLAN identity across trunks. TPID, TCI, PCP, DEI, VID, and the native VLAN explained byte by byte.

6 min read Apr 25, 2026

STP public

Rapid Spanning Tree Protocol (RSTP): What Changed from 802.1D STP

J

RSTP (802.1w) replaced classic 802.1D's 30-50 second convergence with sub-second failover. The five key changes that make it possible, and how to deploy Rapid PVST+ on Cisco IOS XE.

7 min read Apr 25, 2026

BGP public

BGP vs OSPF: When to Use Each Routing Protocol

J

BGP and OSPF solve different problems and almost always run together in production. The technical differences, when each is the right answer, and the architecture pattern most enterprises end up with.

7 min read Apr 25, 2026

802.1X public

Cisco ISE 802.1x Wired Configuration: A Practical Step-by-Step Guide

J

A complete, copy-pasteable walkthrough of deploying wired 802.1x with Cisco ISE as the RADIUS server and a Catalyst switch as the authenticator — from Policy Sets to IBNS 2.0 CLI to show commands and Live Logs.

12 min read Apr 20, 2026

Cisco public

Cisco SD-WAN in 2026: The Real Value Is Day-2 Operations

J

Path steering is now table stakes. Real SD-WAN value in 2026 comes from Day-2 operations: template management, observability, policy drift, and upgrade discipline. Here is what actually matters once the rollout is done.

16 min read Apr 7, 2026