Cisco CCNA Study Guide - Router Alley

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CCNA Study Guide v2.62 – Aaron Balchunas 216 Troubleshooting EIGRP (continued) To view the IP routing table: Router# show ip route Gateway of last resort is not set C C D 172.16.0.0 is directly connected, Serial0 172.19.0.0 is directly connected, Serial1 10.3.0.0 [90/2297856] via 172.16.1.2, 00:00:15, Serial0 To view a specific route within the IP routing table: Router# show ip route 10.3.0.0 Routing entry for 10.3.0.0/16 Known via “eigrp 10”, distance 90, metric 2297856 type internal Last update from 172.16.1.2 on Serial 0, 00:00:15 ago To debug EIGRP in realtime: Router# debug eigrp neighbors Router# debug eigrp packet Router# debug eigrp route Router# debug eigrp summary * * * All original material copyright © 2013 by Aaron Balchunas (aaron@routeralley.com), unless otherwise noted. All other material copyright © of their respective owners. This material may be copied and used freely, but may not be altered or sold without the expressed written consent of the owner of the above copyright. Updated material may be found at http://www.routeralley.com.
CCNA Study Guide v2.62 – Aaron Balchunas 217 OSPF (Open Shortest Path First) Section 20 - Open Shortest Path First - OSPF is a standardized Link-State routing protocol, designed to scale efficiently to support larger networks. OSPF adheres to the following Link State characteristics: • OSPF employs a hierarchical network design using Areas. • OSPF will form neighbor relationships with adjacent routers in the same Area. • Instead of advertising the distance to connected networks, OSPF advertises the status of directly connected links using Link-State Advertisements (LSAs). • OSPF sends updates (LSAs) when there is a change to one of its links, and will only send the change in the update. LSAs are additionally refreshed every 30 minutes. • OSPF traffic is multicast either to address 224.0.0.5 (all OSPF routers) or 224.0.0.6 (all Designated Routers). • OSPF uses the Dijkstra Shortest Path First algorithm to determine the shortest path. • OSPF is a classless protocol, and thus supports VLSMs. Other characteristics of OSPF include: • OSPF supports only IP routing. • OSPF routes have an administrative distance is 110. • OSPF uses cost as its metric, which is computed based on the bandwidth of the link. OSPF has no hop-count limit. The OSPF process builds and maintains three separate tables: • A neighbor table – contains a list of all neighboring routers. • A topology table – contains a list of all possible routes to all known networks within an area. • A routing table – contains the best route for each known network. * * * All original material copyright © 2013 by Aaron Balchunas (aaron@routeralley.com), unless otherwise noted. All other material copyright © of their respective owners. This material may be copied and used freely, but may not be altered or sold without the expressed written consent of the owner of the above copyright. Updated material may be found at http://www.routeralley.com.
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