Scenario-2 Branch Office Network Setup

Scenario 2 will be based around building from scratch (using Cisco’s VIRL to simulate the topology) a medium sized branch office network that consists of two Layer 2 switches hosted in two separate Wire Closets that connect back to a highly available Layer 3 collapsed core switch layer.

Screen Shot 2017-12-03 at 9.31.47 AMThe scenario will be broken down into smaller sub sections each focused on addressing various configuration scenarios starting with setting basic universal switch configuration items across the different switches in the topology, establishing inter-switch connectivity including setting up 801.1q trunks, Etherchannel connections, Layer 2 settings like VLANS and Spanning Tree, Layer 3 SVIs and HSRP configuration and so on.

The Core switches will be connected to each other by way of a two port Layer 2 Etherchannel Trunk and will act as the Spanning Tree Root bridge for the topologies VLANS.

The Core switches will also host the VLAN SVI configuration and will utilize HSRP to provide First Hop Router Redundancy.

We will introduce some Spanning Tree Load Balancing by setting CORE-1A as the Spanning Tree Root Bridge and HSRP active router for all odd numbered VLANS and CORE-1B as the Root Bridge and active router for all even numbered VLANS.

The User Access Switches in each Wire Closet will be connected to each other by way of Layer 2 Etherchannel connections, and we will use this opportunity to explore using both LACP and PaGP to set the connections up.

We will draw on Cisco’s Design Guides to incorporate a number of their best practices and recommendations into our network.


  1. Configure Universal Switch Settings
  2. Configure and Verify Inter Switch Link Settings
  3. Configure Layer 2 Vlans and Spanning Tree

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