Part Of Studying For CCNA Exam Success Is Keeping All These New Commands Straight In Your Head! And Let's Face It, There Are A Lot Of Commands You Need To Know In Order To Pass The CCNA Exam And Earn That Certification. Here's A Review Of Some Very Important Distance Vector And Static Routing Commands You Need To Know, Along With Their Proper Usage And Console Output.Bandwidth IGRP Makes A Default Assumption That Any Serial Interface Running IGRP Is Connected To A T1 Line, Which Runs At 1544 KBPS. With Equal-cost Load-balancing Enabled By Default, This May Be An Undesirable Assumption.To Alter IGRPs Assumption, Use The Bandwidth Command On The Serial Interface In Question. Note That This Command Does NOT Actually Affect The Bandwidth Available To The Interface; It Merely Changes IGRPs Assumption Of The Bandwidth.R2conf TR2(config)int S0R2(config-if)bandwidth 512Clear Ip Route This Command Clears Your Routing Table Of All Non-static And Non-connected Routes. In A Lab Environment, Its Very Handy Because It Forces Your Routers Running Routing Protocols To Send And Request Updates, Rather Than Waiting For The Regularly Scheduled Updates.R2clear Ip Route Debug Ip Igrp EventsDebug Ip Igrp Events Allows You To See IGRP Updates Being Sent And Requested. Here, The Debug Is Run And Then The Routing Table Is Cleared. The Router Immediately Broadcasts Update Requests Via The IGRP-enabled Interfaces.R2debug Ip Igrp EventIGRP Event Debugging Is OnR2clear Ip Route 06:02:51: IGRP: Broadcasting Request On BRI006:02:51: IGRP: Broadcasting Request On Serial0.123Debug Ip Igrp TransactionsTo Configure IGRP Unequal-cost Load-sharing With The Variance Command, Youve Got To Know The Metric Of The Less-desirable Routes. EIGRP Keeps These In Its Topology Table; IGRP Has No Such Table.To Get The Metrics Of Routes Not In The Routing Table, Run Debug Ip Igrp Transactions. To Force IGRP Updates, The Routing Table Below Was Cleared With Clear Ip Route .R2debug Ip Igrp TransactionsIGRP Protocol Debugging Is OnR2clear Ip Route 06:05:33: IGRP: Received Update From 172.12.123.1 On Serial0.12306:05:33: Subnet 172.12.123.0, Metric 10476 (neighbor 8476)06:05:33: Network 1.0.0.0, Metric 8976 (neighbor 501)06:05:33: IGRP: Edition Is Now 306:05:33: IGRP: Sending Update To 255.255.255.255 Via BRI0 (172.12.12.2)06:05:33: Network 1.0.0.0, Metric897606:05:33: IGRP: Sending Update To 255.255.255.255 Via Serial0.123 (172.12.123.2) - Suppressing Null Update06:05:34: IGRP: Received Update From 172.12.12.1 On BRI006:05:34: Subnet 172.12.13.0, Metric 160250 (neighbor 8476)06:05:34: Network 1.0.0.0, Metric 158750 (neighbor 501)Debug Ip RipR2debug Ip RipIP Protocol Debugging Is OnR2clear Ip Route 6:14:53: RIP: Received V2 Update From 172.23.23.3 On Ethernet06:14:53: 1.0.0.08 Via 0.0.0.0 In 16 Hops (inaccessible)6:14:53: 1.1.1.132 Via 0.0.0.0 In 2 Hops6:14:53: 172.12.0.016 Via 0.0.0.0 In 16 Hops (inaccessible)6:14:53: 172.12.12.232 Via 0.0.0.0 In 2 Hops6:14:53: 172.12.13.030 Via 0.0.0.0 In 1 Hops6:14:53: 172.12.123.024 Via 0.0.0.0 In 1 Hops6:14:53: 172.23.0.016 Via 0.0.0.0 In 16 Hops (inaccessible)Run Debug Ip Rip To Troubleshoot Routing Update Problems, RIP Authentication Problems, And To View The Routing Update Contents. Clear Ip Route Was Run To Clear The Routing Table And To Force A RIP Update. Ip Route R2conf TR2(config)ip Route 1.1.1.1 255.255.255.255 172.12.123.1ORR2(config)ip Route 1.1.1.1 255.255.255.255 Serial0To Configure A Static Route To A Given Destination IP Address, Use The Ip Route Command. The Destination Is Followed By A Subnet Mask, And That Can Be Followed By Either The Next-hop IP Address Or The Exit Interface On The Local Router.Ip Route 0.0.0.0 0.0.0.0 R2conf TR2(config)ip Route 0.0.0.0 0.0.0.0 172.12.123.1ORR2(config)ip Route 0.0.0.0 0.0.0.0 Ethernet0To Configure A Default Static Route, Use Either Of These Two Commands.You Could Have Any Number For The First 0.0.0.0", Since The Second Set Of Zeroes Is The Subnet Mask. This Means That Any Destination Will Match This Route Statement. That's A Good Review To Get Started With! I'll Be Back Tomorrow With Part II Of This CCNA Exam Command Review!
