How to Configure ISP Failover With Default Routes Using IP SLA Tracking

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For a high-availability network, enterprise companies typically maintain connections with multiple internet service providers (ISPs) to ensure redundant internet connectivity. Among these ISPs, one is usually preferred over the others, often due to higher bandwidth or other factors. This preferred ISP serves as the primary link, while the connection from the second ISP acts as […]

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How to Configure Floating Static Route

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A floating static route is a backup route configured with a higher administrative distance than the primary route. It serves as a failover mechanism in case the primary route becomes unavailable. A floating static route is mainly used when there are two connections from a router to a subnetwork. The first connection may be using

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How to Configure OSPF Default Route on a Cisco Router

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In any network, a default route serves as a fallback option for routers to forward traffic if there is no specific path to the destination of the traffic in the routing table. When a router receives a packet, it searches its routing table for a route to the destination. If a route exists, the router

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How to Configure OSPF DR and BDR (Manipulating OSPF DR & BDR Election)

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Unlike point-to-point OSPF network, where OSPF routers exchange hello messages using the OSPF hello protocol to establish and maintain neighbor relationships, a multi-access network with three or more OSPF routers needs to elect an OSPF-designated router (DR) and a backup-designated router (BDR) in order to establish and maintain neighbor relationships. The DR and BDR are

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Etherchannel Configuration Lab

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The objective of this lab is to configure Etherchannel on a network consisting of two switches joined together using two cables. Etherchannel helps bundle multiple links connecting two network devices into one virtual link with a higher bandwidth. There are three methods of etherchannel configuration, two of which use negotiation protocols for interfaces to form

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HSRP Configuration Lab

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The objective of this lab is to configure the Hot Standby Router Protocol (HSRP) on two routers that are connecting a host device to the internet.   Hot Standby Router Protocol (HSRP) is a Cisco proprietary redundancy protocol that provides high availability service to a host device by allowing two or more routers to serve

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Static Routing Configuration Lab

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In this lab, the objective is to configure a static route on a network consisting of three Cisco routers (R1, R2, and R3). A static route is a route added manually to the routing table that tells a router the path to reach a subnetwork. Network Topology The network topology for this lab is shown

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How to Configure OSPF Passive Interface on Cisco Router

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Whenever we advertise networks on a router in the OSPF configuration mode, the OSPF route advertisement will be enabled on all the interfaces of the router. However, it is good practice to disable the advertisement on interfaces connecting to networks that are not part of the autonomous system or interfaces that are idle. Disabling the

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How to Configure OSPF Backbone Area | How to Configure OSPF Area 0

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OSPF is a widely used dynamic routing protocol. It is an open standard protocol, meaning that any router will support it. It uses a link-state algorithm to dynamically learn the route to every subnet existing in a single autonomous system. In a multi-area OSPF network, the backbone area (Area 0) obtains the summarized route from

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OSPF Multi-Area Configuration Lab

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In this lab, the objective is to configure the OSPF Multi-Area Network (depicted below) to enable route summarization. An OSPF multi-area network is a network that consists of numerous routers (often hundreds or thousands) organized into different areas. OSPF is configured in each of these specific areas with a different Area number. Typically, when a

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