Rick Donato

Introduction Within this 3 part series we will be looking at 3 types of FHRP (First Hop Redundancy Protocol) on Cisco IOS - HSRP, VRRP and GLBP. We will look into the features that they each provide and also how to configure them. We will begin by exploring HSRP. So

Introduction Within this article, we will look at equal cost and unequal cost traffic distribution in EIGRP. Note: This article is written based upon Cisco IOS 15.x. ECMP - Equal Cost Out of the box, EIGRP provides ECMP, which can also be configured via the maximum-path command. Via the

Introduction Within this article we will look at a Cisco feature called EIGRP named mode. As this involves IPv6 we will also provide an overview of IPv6 in EIGRP, whilst also providing a configuration example. The Problem Though EIGRP supports both IPv4 and IPv6, the configuration methods for both differ.

Introduction In order for OSPF-enabled routers to exchange information, they must form an adjacency (relationship) with their neighbor. Within this article, we will look at the process and various steps involved. Relationship Requirements Before the OSPF router even starts to try and form an adjacency, OSPF must know/determine the

Introduction The controller cluster in the NSX platform is the control plane component responsible for managing the hypervisor switching and routing modules. This includes the logical switches and VXLAN overlay. Due to the centralized, decoupled model of the controller, it provides the ability to reduce broadcast traffic, in turn negating

Overlay networks decouple the network services from the underlying physical network infrastructure. This is achieved by running a virtual network onto of the underlay via the use of network encapsulation. There are 2 main types of overlay solutions - Network-Centric and Host-Centric Overlays. Network-Centric With Network-Centric overlays, the network device

Introduction In the world of virtualization and connectivity, the virtual switch is one of the most fundamental components, providing networking connectivity between virtual machines, along with connecting them to the physical world. VMware provides 3 types of virtual switch, the virtual Standard Switch (vSS), the virtual Distributed Switch (vDS), and

When BUM (Broadcast, Unknown unicast and Multicast) traffic is sent out from a VM, the source VTEP must replicate this traffic out to the other VTEPs via VXLAN encapsulation. NSX provides 3 modes of replication - Multicast, Unicast and Hybrid. Multicast Multicast replication utilizes L2 (IGMP) and L3 (PIM) multicast

Within this short article, we will look at the difference between local and directed broadcasts. Local Broadcast A local (link-local) broadcast (255.255.255.255) is performed within the broadcast domain. It is only local and never forwarded. Directed Broadcast A directed broadcast, on the other hand, is the broadcast