Router Nest

01/06/2026

01/06/2026

🔥 Access Ports, Trunk Ports & Native VLAN Explained! 🔥

Understanding the difference between Access Ports, Trunk Ports, and Native VLANs is one of the most important skills for every Network Engineer and CCNA/CCNP candidate.

📌 Access Port
✅ Connects end devices (PCs, printers, IP phones)
✅ Carries traffic for a single VLAN
✅ Frames are transmitted untagged

📌 Trunk Port
✅ Connects switches, routers, firewalls, and wireless controllers
✅ Carries multiple VLANs over a single link
✅ Uses IEEE 802.1Q tagging

📌 Native VLAN
✅ Handles untagged traffic on trunk links
✅ Must match on both sides of the trunk
✅ Best practice: Use a dedicated VLAN (avoid VLAN 1)

💡 In this infographic you'll learn:
🔹 Port types and their functions
🔹 Cisco IOS configuration examples
🔹 Native VLAN configuration
🔹 Verification commands
🔹 VLAN best practices
🔹 Real-world troubleshooting tips

⚡ Pro Tip: Always verify your trunk links with commands such as:
show interfaces trunk
show interfaces switchport
show vlan brief

🎯 Quick Question:
What Native VLAN do you use in your production environment—VLAN 1 or a dedicated management VLAN such as VLAN 99?

Drop your answer in the comments! 👇

01/06/2026

🚀 Three-Layer Network Architecture – The Backbone of Modern Enterprise Networks! 🚀

Understanding the Core, Aggregation (Distribution), and Access Layers is essential for designing scalable, resilient, and high-performance networks.

🌐 Core Layer
✅ High-speed backbone connectivity
✅ Redundant paths for maximum uptime
✅ Fast packet forwarding across the network

🔄 Aggregation Layer
✅ Traffic aggregation from access switches
✅ Policy enforcement and routing decisions
✅ VLAN segmentation and traffic control

🖥️ Access / ToR Layer
✅ Connects servers, workstations, CCTV, and end devices
✅ Provides network access and PoE services
✅ Acts as the entry point to the enterprise network

🔥Topology highlights:
✔️ Redundant Core Switches
✔️ High-Speed 100G & 10G Links
✔️ Aggregation and ToR Switching
✔️ Server Farms & Data Center Connectivity
✔️ CCTV & Biometric Systems Integration
✔️ Network Monitoring & IPAM Management

A properly designed three-tier architecture improves:
📈 Scalability
🛡️ Security
⚡ Performance
🔄 High Availability
🛠️ Easier Troubleshooting

💡 Are you using a traditional Three-Tier Architecture or have you migrated to a Spine-Leaf Data Center Design?

Share your experience in the comments! 👇

31/05/2026

Last step of troubleshooting!
Follow & subscribe Router Nest ✅✅

31/05/2026

Zscaler SASE
Follow & subscribe Networks Baseline

31/05/2026

Firewall comparison
Follow & subscribe Networks Baseline ❤️❤️

31/05/2026

🚀 BGP Troubleshooting Made Simple! 🚀

Are your BGP neighbors stuck in Idle, Active, or refusing to establish? This easy-to-follow troubleshooting guide covers the essential steps every Network Engineer should know when diagnosing BGP issues.

🔍 What You'll Learn:
✅ Verify basic IP connectivity
✅ Check BGP neighbor status
✅ Validate AS numbers
✅ Confirm TCP Port 179 connectivity
✅ Verify routing reachability
✅ Troubleshoot MD5 authentication issues
✅ Check route advertisements and filtering
✅ Analyze logs and debug output

📚 Key BGP Commands Included
🔹 show ip bgp summary
🔹 show ip bgp neighbors
🔹 show ip bgp
🔹 show ip route
🔹 show logging
🔹 debug ip bgp

⚡ Common BGP Problems
❌ AS Number mismatch
❌ TCP 179 blocked by firewall/ACL
❌ Missing route in RIB
❌ Incorrect neighbor IP
❌ Prefix-list or route-map filtering
❌ Authentication password mismatch

💡 Pro Tip:
Always start with Layer 3 connectivity before diving into BGP-specific troubleshooting. Most BGP issues come down to reachability, routing, filtering, or AS configuration errors.

Whether you're studying for CCNA, CCNP, CCIE, JNCIS, JNCIP, or working in a production network, mastering BGP troubleshooting is a must-have skill.

👇 What is the most common BGP issue you've encountered in your network?