CCNA Routing and Switching Lessons 08-09 - Routing Protocols - Eric Vanderburg
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CCNA Routing and Switching Lessons 08-09 - Routing Protocols - Eric Vanderburg

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CCNA Routing and Switching Lessons 08-09 - Routing Protocols - Eric Vanderburg

CCNA Routing and Switching Lessons 08-09 - Routing Protocols - Eric Vanderburg

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CCNA Routing and Switching Lessons 08-09 - Routing Protocols - Eric Vanderburg CCNA Routing and Switching Lessons 08-09 - Routing Protocols - Eric Vanderburg Presentation Transcript

  • Routing Protocols Chapters 8-9 Networking Essentials – Eric Vanderburg © 2005
  • RIP  Version 1       15 max hop count Broadcasts routing updates (30 secs) Distance vector Classfull Hop count metric Version 2     255 max hop count Multicasts routing updates Classless (supports VLSM) Supports authentication (MD5)
  • RIP commands  Router rip Network network address  Version 2 (optional)  Debug ip rip  Passive-interface serial0 – does not send out RIP updates from this interface  View slide
  • IGRP Distance vector  Metric uses bandwidth & delay  Bandwidth is based on the lowest speed link in the route.  Broadcasts route every 90 secs  Classfull  Cisco proprietary  Grouped into AS  View slide
  • IGRP commands  Router igrp as#  Network network number Debug ip igrp transactions – shows updates Debug ip igrp events – shows all igrp packets  
  • Distance Vector Route Poisoning – send infinite metric  Split Horizon – do not send out updates from interfaces in which we received those updates  Poison reverse (Cisco only) – send infinite metric to all devices  Hold down timer – does not update routes for an infinite metric route for a certain amount of time 
  • OSPF (Open Shortest Path First)         Link state Keeps a topology database Best route is calculated using the SPF algorithm Converges in about 10 secs Classless Uses hello messages to determine if a link is down Sends LSA’s (Link State Advertisements) when a link changes Grouped into AS (areas)
  • OSPF commands  Router ospf processID        Network ipaddress mask area areaID Ip ospf cost cost – cost for an interface Bandwidth bandwidth – for interface Ip ospf hello # - hello interval Show ip ospf neighbor – shows those with whom you share updates Debug ip ospf events – show ospf packets Debug ip ospf hello – show hello messages
  • Integrated IS-IS (Intermediate System to Intermediate System) Link state  Created by ISO  Supports multiple layer 3 protocols (ISIS did not)  Advertises CLNP (Connectionless Network Protocol) routes as well as IP routes. 
  • Link State Sends updates when link state changes  Everyone keeps a database of the entire AS  Shorter convergence time  More processing required  Unicast updates are sent to a DR (Designated Router) & BDR (Backup Designated Router) to save bandwidth.  DR multicasts to the rest of the AS 
  • EIGRP (Enhanced Interior Gateway Routing Protocol) Hybrid protocol (balanced hybrid)  DUAL (Diffusing Update Algorithm)  uses less processing than SPF  Calculates alternate routes as well (successor / feasible successors) – can switch immediately  Converges in 3 seconds  Cisco proprietary  Classless 
  • EIGRP (Enhanced Interior Gateway Routing Protocol) Sends partial updates  Supports authentication  Same metric as IGRP * 256  Compatible with IGRP  Grouped into AS 
  • EIGRP commands  Router EIGRP AS# Network network number mask  Maximum-paths # - number of routes to same network stored in routing table  Show ip eigrp neighbors – show those you share updates with  Show ip route eigrp – show only eigrp routes  Show ip eigrp topology – show successors and feasible sucecssors 