Always Networks Blog - Design

GRE Tunnels and VRFs

Wed 23 January 2019
Tunnel

GRE Tunnelling. It's a tool that should be in every network engineer's toolbox, but not one we like to use very often.

But sometimes, it's needed. Sometimes you need to just make something work, across somebody else's network. This week's task is to do just that, in support of an office migration for a client.

So, let's have a look at how GRE works, and …

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Design Consideration - The effects of VLAN ID's on Spanning-Tree convergence

Network Switch

When designing a network, consideration should be given to separating traffic into VLANs. This is done for logical separation, security and performance reasons.

This affects the convergence of a Layer 2 Network. Most Cisco switches running STP (Spanning-Tree Protocol) will be running an instance per VLAN. This is called PVST (Per VLAN Spanning-Tree), or RPVST (Rapid Per VLAN Spanning-Tree), depending on whether you are running …

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