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Overview/Description
OSPF is a link-state protocol based on the open standard. At a high level, OSPF operation consists of three main elements: neighbor discovery, link-state information exchange, and best-path calculation. To calculate the best path, OSPF utilizes SPF or Dijkstra's algorithm. The input information for the SPF calculation is link state information, which is exchanged between routers through several different OSPF message types. These message types help improve convergence and scalability in multiarea OSPF deployments. OSPF also supports several different network types, which...
Overview/Description
OSPF as a link state protocol uses several different packets to exchange information about network topology between routers. These packets are called link-state advertisements and they describe the network topology in great detail. Each router stores the received LSA packets in the link-state database. After LSDBs are synced between the routers, OSPF uses the shortest path first algorithm to calculate the best routes. The best intra-area routes are calculated individually by each OSPF router. For the best interarea route calculation, the internal router must also rely on...
Overview/Description
Open OSPF is a widely used IGP in IPv4, IPv6, and dual-stack (IPv4/IPv6) environments. The OSPF upgrade to support IPv6 generated a number of significant changes to how the protocol behaves. Understanding the differences between OSPFv2 and OSPFv3 is required for the successful deployment and operation of an IPv6 network using OSPF for routing. This lesson describes OSPFv3, the IPv6-capable version of the OSPF routing protocol, including its operations, configuration, and commands. This course describes how to implement OSPFv3 in a dual-stack (IPv4/IPv6) environment and...
Overview/Description
Open OSPF is a widely used IGP in IPv4, IPv6, and dual-stack (IPv4/IPv6) environments. The OSPF upgrade to support IPv6 generated a number of significant changes to how the protocol behaves. Understanding the differences between OSPFv2 and OSPFv3 is required for the successful deployment and operation of an IPv6 network using OSPF for routing. This lesson describes OSPFv3, the IPv6-capable version of the OSPF routing protocol, including its operations, configuration, and commands. This course describes how to implement OSPFv3 in a dual-stack (IPv4/IPv6) environment and...
Overview/Description
Simple routing protocols work well for simple networks, but as networks grow and become more complex, it may be necessary to change the routing protocols. Often, the transition between routing protocols takes place gradually, so there are multiple routing protocols that are operating in the network for variable lengths of time. This course describes how these problems can be resolved by redistribution from one routing protocol to another. You will also learn how Cisco routers make route selections when multiple protocols are active in the network.
Target Audience...
Overview/Description
Many IP routing challenges can be solved using route redistribution. Having a method to manipulate the redistribution process increases your options and flexibility. There is no one type of route filter that is appropriate for every situation. Therefore, the more techniques that you have at your disposal, the better your chances of solving connectivity challenges. To ensure that the network operates efficiently, you often need to control the redistribution process. By implementing filtering mechanisms, you can influence which information is redistributed between...
Overview/Description
Given that bandwidth of modern networks is continually increasing at a steady rate, packet switching efficiency is important. As a network administrator, you must understand packet switching methods and their evolution. Cisco Express Forwarding is the state-of-the-art switching method, and the most commonly used method. Therefore, you must be familiar with its operations so that you can effectively maintain and troubleshoot your network. In IP networks, packets are routed by destination address. Sometimes, especially in a complex, highly redundant network, this approach...
Overview/Description
The Internet is a vital resource in many organizations and it requires a single connection or, more frequently, redundant connections to multiple ISPs. With multiple connections, BGP is an alternative to using default routes to provide dynamic control over path selections. After completing this course, you will be able to plan for enterprise Internet connectivity and establish single-homed IPv4 Internet connectivity.
Target Audience
Anyone wishing to obtain real-world routing knowledge, and those that are considering CCNP and CCIP certification. This learning path's...
Overview/Description
After successful configuration, BGP will be able to establish a neighbor relationship, set the next-hop address, set the source IP address of a BGP update, and announce networks to other BGP routers. A router that is running BGP goes through several neighbor states through which BGP progresses to establish a BGP session, and offers hints for troubleshooting BGP, because the session can be stuck in the SIA or idle state. This course explains EBGP and IBGP configuration, as well as authentication between neighbors. This course also describes basic BGP configuration, and...
Overview/Description
BGP can be used to perform PBR. To manipulate the best paths that are chosen by BGP, you need to understand the different attributes that BGP uses and how BGP selects the best path that is based on these attributes. Where multiple paths exist between your network and ISP, you need to filter certain information during the exchange of BGP updates to influence the route selection or to enforce an administrative policy. To meet this requirement, you must use filters. The primary filtering tools include route maps and prefix lists. Also, an AS path list is a useful tool for...
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