VLANs – Cisco and Juniper Basics

VLANs – Cisco and Juniper Basics

🚀 Quick #CCNA Tip: Mastering VLANs!

VLANs are not just about segmenting a network for better management— they’re crucial for security, performance, and scalability.

🔹 Security: Isolating sensitive data traffic from the rest

🔹 Performance: Reducing broadcast domains enhances network efficiency

🔹 Flexibility: Easier network management and control

🚀 Let’s Dive a little into VLANs on Cisco IOS & Juniper Devices!

Understanding and troubleshooting VLAN issues are essential skills for network engineers. Here’s how you can handle VLAN configurations and resolve common issues on both Cisco IOS and Juniper devices.

Cisco IOS

Setup: Configure a VLAN using “vlan 10” followed by “name Marketing”.

Assign Ports: Add ports to VLAN 10 with “interface fastEthernet 0/1” and then “switchport access vlan 10”.

Troubleshoot: If devices can’t communicate, check VLAN assignment with “show vlan brief” and ensure all ports are correctly assigned.

Juniper Devices

Setup: Create a VLAN using “set vlans Marketing vlan-id 10”.

Assign Ports: Link interfaces to VLAN with “set interfaces ge-0/0/1 unit 0 family ethernet-switching vlan members Marketing”.

Troubleshoot: Use “show vlans” to verify the VLAN configuration and “show interfaces” to check if the interfaces are correctly tagged.


Consistency: Ensure VLAN IDs are consistent across all devices.

Prune: Regularly prune unused VLANs to keep the network clean.

Documentation: Keep your network diagrams and VLAN assignments up to date.

#CCNA #Cisco #Juniper #NetworkEngineering #VLANs

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