OSPF Configurations and Verifications Table 1-3 lists the OSPFv2/v3 default parameters. You can alter OSPF parameters as necessary. You are not required to alter any of these parameters, but the following parameters must be consistent across all routers in an attached network: ospf hello-interval and ospf dead-interval. If you configure any of these parameters, be sure […]

Note The backbone area 0 cannot be an NSSA All OSPF areas must physically connect to area 0 (backbone area). If one area cannot connect directly to area 0, you need a virtual link. Virtual links allow you to connect an OSPF area ABR to a backbone area ABR when a direct physical connection is […]

OSPF Areas An area is a logical division of routers and links within an OSPF domain that creates separate subdomains. LSA flooding is contained within an area, and the link-state database is limited to links within the area, which reduces the CPU and memory requirements for an OSPF-enabled router. You can assign an area ID […]

OSPF From the supported IGP protocols, the one that is covered is the Open Shortest Path First (OSPF). It is an IETF link-state routing protocol, which distributes information within a single autonomous system(AS). OSPF has two versions: IPv4 OSPFv2 (version 2), which is described in RFC 2328, and IPv6 OSPFv3 (version 3), which is described […]

Foundation Topics Routing Protocols Support on Cisco Nexus Devices The Cisco Nexus devices line-up at the time of writing this book consists of Cisco Nexus 9200, Cisco Nexus 9300, Cisco Nexus 9400, Cisco Nexus 9500, Cisco Nexus 9800 and the ultra-low latency Cisco Nexus 3550, as well as Nexus 3400 and 3600 switches. Note: In […]

Chapter 1. Implementing Routing in the Data Center 5. Which statement about IPv6 and routing protocols are true? a. Link-local addresses are used to form routing adjacencies. b. OSPFv3 is the only routing protocol that supports IPv6. c. Loopback addresses are used to form routing adjacencies. d. MBGP does not support the IPv6 protocol. 6. […]

Chapter 1. Implementing Routing in the Data Center Data centers are an essential element of the Internet and cloud infrastructure. It is the data networks that deliver data services around the world. This task would be impossible without routing. Even in the new generation of facilities like edge data centers, routers play an important role […]