Zero Trust Begins With Internal Segmentation and Inspection In this post, I want to highlight a common network topology in K12s where the traditional three tiered or collapsed core designs are used. In that architecture, typically, routing is done either on the core or aggregation switch. Instead, we can take a more security first approach to how traffic is handled internally and out to the internet. To begin, I’ll dive into how traffic flows in this typology and provide examples in a lab. Something key to look at in this design is that traffic will be implicitly allowed unless you set up L3 filtering rules. In traditional IP routing when you begin setting up routes and subnets on your core switch, inter-VLAN routing is enabled by default. This is a requirement because that is what allows your internal traffic out to the internet, typically over a transport VLAN to your NAT router or firewall, but the flaw is that it allows all traffic within ...
Instant Port enables you to automate your access layer by dynamically assigning VLANs based on the end devices MAC and/or LLDP capabilities. This document will cover the configuration of instant port and show an example. Configuration of Instant Port is simple. First, create an Instant Port Profile within your network policy then assign that profile to your Switch Template. · The Non-Forwarding VLAN will be used by default to learn the MAC and LLDP capabilities of the end device. · The Default Port Type will be used if you wish to provide non-matching devices layer two connectivity. · You can choose whether to allow non-matching devices to use either the Default Port Type or the Non-Forwarding VLAN. By using the Non-Forwarding VLAN, unknown devices will be dropped in an unused VLAN without the ability to reach other ...
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