Cisco IOS - How to Configure VRF-Lite

What is VRF-Lite? VRF is a feature that allows you to create separate instances of the routing table. In turn allowing you to segregate and isolate different network types. When VRFs are used without MPLS it is classed as VRF-lite. VRF-lite configuration doesn’t need the route-target and can be…

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Cisco IOS - BGP Summarization

Introduction In order to reduce the amount of routing information within the routing table, routing summarization is used. Cisco IOS provides 3 types of BGP summarization: Aggregate Address - BGP is configured to advertise an aggregate network via the aggregate-address command. Manual - A summarized network is added to RIB…

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How to Build a NXOS-9000v Based EVPN VXLAN Fabric

Introduction The goal of this article will be to provide you with the required steps to build a Virtual eXtensible LAN Ethernet VPN (VXLAN EVPN) fabric using the Cisco NXOS-9000v. The topology will be built using various protocols, so before we dive in let's look at the various protocols, some…

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What Are the Key Differences Between Cisco IOS and IOS-XE?

IOS Classical IOS is based upon a monolithic kernel. This monolithic kernel runs all of its modules within the same memory space, providing no CPU or memory separation. Therefore, in the event of a single process/module crashing, the entire system would become unresponsive. Another disadvantage is around upgrades, as…

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