A link-state routing protocol is a sophisticated routing protocol based on the Dijkstra Shortest Path First (SPF) algorithm. When compared to distance-vector routing, link-state routing processes more information locally to reduce network traffic, trading additional memory and processor time for less bandwidth consumption. Link-state routing protocols record all possible routes, and therefore avoid many of the techniques required by distance-vector protocols to avoid loops.&n..
Verifying IP Connectivity and Troubleshooting
At one point or another, every administrator must troubleshoot a user's complaint of not being able to reach some destination on the network. Lack of connectivity can be the result of network outages caused by WAN service failures, misconfiguration of routers and other devices in the network, access list controls (whether intentional or otherwise), and myriad other possibilities. Although there is no substitute for network test equipment, such as protocol analyzers, the route..
Local-Area Network Technologies
Cisco devices support multiple LAN technologies. We cover five popular technologies in this chapter: • Ethernet and IEEE 802.3 • Fast Ethernet • Gigabit Ethernet • Token Ring • Fiber Distributed Data Interface Each of these protocols operates at the data link layer of the OSI reference model, and each is used in a LAN environment to carry data from point to point at speeds from 4 Mbps to 1 Gbps. This section briefly introduces you to e..
Some additional methods allow faster STP convergence if a link failure occurs: ■ PortFast—Enables fast connectivity to be established on access-layer switch ports to workstations that are booting ■ UplinkFast—Enables fast-uplink failover on an access-layer switch when dual uplinks are connected into the distribution layer ■ BackboneFast—Enables fast convergence in the network backbone or core layer switches after a spanning-tree topology change occurs Instea..
EIGRP redistribute Command Reference
First, for reference, the following lines show the generic syntax of the redistribute command when used as a router eigrp subcommand. Note that the syntax differs slightly depending on the routing protocol into which routes will be redistributed. Following that, Table 9-2 lists the options on the command with a brief description. redistribute protocol [process-id | as-number] [metric bw delay reliability load mtu ] [match {internal | nssa-external | external 1 | extern..
