Router Configuration PJC CCNA Semester 2 Ver. 3.0 by William Kelly

Testing Utilities for the OSI Layers

Layer 1 Physical Layer Troubleshooting Shorted, broken, or disconnected cables Cables hooked up backwards Wrong type of cable used (rollover, crossover, straight through) Transceiver problems Devices turned off

Layer 2 Troubleshooting Serial or Ethernet Interfaces not configured properly Wrong encapsulation (HDLC vs. PPP) Authentication fails because of remote or central router Network Interface Card (NIC) problems

Layer 3 Troubleshooting Routing protocol not enabled, wrong protocol used, or configured improperly Network address is wrong Subnet mask is wrong Gateway is wrong (Make sure to use the actual interface address and NOT a network address for the gateway)

The ping Command Ping is an echo protocol that helps evaluate path reliability Ping is used to troubleshoot lower level OSI connectivity The basic ping can be used in both the user and privileged mode

The traceroute Command Traceroute follows the route data travels through a network and can be used to find broken network connections (broken end to end connectivity) Traceroute can be used at the user and privileged level Traceroute operates by sending pings with ever increasing Time to Live (TTL) values Ctrl-Shift-6 can be used to cancel a traceroute

Telnet and Advanced Telnet Telnet is used to verify the application layer between the source and the destination A router can have 5 simultaneous telnet sessions (vty 0 – 4) Telnet depends on the TCP to accurately deliver the data Ctrl + Shift + 6 followed by hitting the letter x will escape the current telnet session The show sessions command will display all the current telnet sessions The resume session# will resume a particular telnet session

Viewing Telnet Connections Moscow#sh sessions % No connections open Moscow#sh connection ? all All Connections elements Show Connection Elements id ID Number name Connection Name port Port Number Moscow#sh connection all ID Name Segment 1 Segment 2 State ==========================================================================

show interface Command Moscow#sh int Serial0/0 is up, line protocol is up Hardware is PowerQUICC Serial Internet address is /30 MTU 1500 bytes, BW 128 Kbit, DLY usec, reliability 255/255, txload 1/255, rxload 1/255 Encapsulation HDLC, loopback not set Keepalive set (10 sec) Last input 00:00:06, output 00:00:01, output hang never Last clearing of "show interface" counters 04:16:03 Queueing strategy: fifo Output queue 0/40, 0 drops; input queue 0/75, 0 drops 5 minute input rate 0 bits/sec, 0 packets/sec 5 minute output rate 0 bits/sec, 0 packets/sec 1349 packets input, bytes, 0 no buffer Received 522 broadcasts, 0 runts, 0 giants, 0 throttles 0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort 774 packets output, bytes, 0 underruns 0 output errors, 0 collisions, 45 interface resets 0 output buffer failures, 0 output buffers swapped out 44 carrier transitions DCD=up DSR=up DTR=up RTS=up CTS=up

show ip protocols Command lab-B>sh ip protocols Routing Protocol is "rip" Sending updates every 30 seconds, next due in 0 seconds Invalid after 180 seconds, hold down 180, flushed after 240 Outgoing update filter list for all interfaces is Incoming update filter list for all interfaces is Redistributing: rip Default version control: send version 1, receive any version Interface Send Recv Key-chain Ethernet Serial Serial Routing for Networks: Routing Information Sources: Gateway Distance Last Update :00: :00:23 Distance: (default is 120)

debug ip rip Command stpete3#debug ip rip RIP protocol debugging is on lab-C# 1d00h: RIP: received v1 update from on Serial1 1d00h: in 3 hops 1d00h: in 2 hops 1d00h: in 2 hops 1d00h: in 1 hops 1d00h: in 2 hops 1d00h: in 1 hops 1d00h: RIP: sending v1 update to via Ethernet0 ( ) 1d00h: network , metric 4 1d00h: network , metric 3 1d00h: network , metric 3 1d00h: network , metric 2 1d00h: network , metric 1 1d00h: network , metric 1 1d00h: network , metric 3 1d00h: network , metric 2...output omitted...

show ip route Command ekterinberg7#show ip route Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area * - candidate default, U - per-user static route, o - ODR P - periodic downloaded static route Gateway of last resort is not set R /8 [120/1] via , 00:00:00, Serial0/1 C /24 is directly connected, Serial0/0 C /24 is directly connected, Serial0/1 C /24 is directly connected, FastEthernet0/0

show version Command Kiev2#sh version Cisco Internetwork Operating System Software IOS (tm) 2500 Software (C2500-D-L), Version 12.0(9), RELEASE SOFTWARE (fc1) Copyright (c) by cisco Systems, Inc. Compiled Mon 24-Jan-00 22:06 by vlad13 Image text-base: 0x030387D0, data-base: 0x ROM: System Bootstrap, Version 11.0(10c), SOFTWARE BOOTFLASH: 3000 Bootstrap Software (IGS-BOOT-R), Version 11.0(10c), RELEASE SOFTWARE (fc1) Kiev3 uptime is 1 hour, 13 minutes System restarted by power-on System image file is "flash:/c2500-d-l bin" cisco 2500 (68030) processor (revision L) with 6144K/2048K bytes of memory. Processor board ID , with hardware revision Bridging software. X.25 software, Version Ethernet/IEEE interface(s) 2 Serial network interface(s) 32K bytes of non-volatile configuration memory. 8192K bytes of processor board System flash (Read ONLY) Configuration register is 0x2102

show cdp neighbors Command Perm#show cdp neighbors Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge S - Switch, H - Host, I - IGMP, r - Repeater Device ID Local Intrfce Holdtme Capability Platform Port ID lab-C Ser R 2500 Ser 1 LAB-A Ser R 2500 Ser 0

show controllers serial 0/0 Command Moscow#show controllers serial 0/1 Interface Serial0/1 Hardware is PowerQUICC MPC860 DTE V.35 clocks stopped. idb at 0x821EA644, driver data structure at 0x821ED540 SCC Registers: General [GSMR]=0x2:0x , Protocol-specific [PSMR]=0x8 Events [SCCE]=0x0000, Mask [SCCM]=0x0000, Status [SCCS]=0x00 Transmit on Demand [TODR]=0x0, Data Sync [DSR]=0x7E7E Interrupt Registers: Config [CICR]=0x00367F80, Pending [CIPR]=0x Mask [CIMR]=0x , In-srv [CISR]=0x Command register [CR]=0x580 Port A [PADIR]=0x4400, [PAPAR]=0xFFFF [PAODR]=0x0000, [PADAT]=0xBBEF Port B [PBDIR]=0x0630F, [PBPAR]=0x0600E [PBODR]=0x00000, [PBDAT]=0x3FFFD Port C [PCDIR]=0x00C, [PCPAR]=0x000 [PCSO]=0x3C0, [PCDAT]=0xFF2, [PCINT]=0x00F Receive Ring rmd(68012A30): status 9000 length 60C address 5C47424 rmd(68012A38): status B000 length 60C address 5C66B64 Transmit Ring tmd(68012AB0): status 0 length 0 address 0 tmd(68012AB8): status 0 length 0 address 0