CCNA Troubleshooting

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7- TROUBLESHOOTING

7.1 Network Troubleshooting

7.2 SPAN

7.3 IP SLA


7.1 Network Troubleshooting


TROUBLESHOOTING OVERVIEW

• A form of problem solving, often

applied to repair failed products or

processes on a system

• Logical, systematic search for the

source of a problem in order to

solve it, and make the product or

process operational again


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TROUBLESHOOTING STEPS

1- Identify the problem

2- Isolate the problem

3- Implement a correct action and fix it

End users are your best friend !


TROUBLESHOOTING COMMANDS

• Ping

• Traceroute

• SSH

• Show Mac Address-Table

• Show IP Interface Brief

• Show IP Route

• Show Running-Config

• Debug Commands


TROUBLESHOOTING TOOLS

• Software : Softwares that are used to

determine the problems in network

(NMS Tools, Protocol Analyzers

(i.e. Wireshark) )

• Hardware : Hardwares that are

used to determine the problems in

network ( Cable testers, multimeters

etc.


SYSLOG MESSAGES FOR TROUBLESHOOTING


USING OSI MODEL FOR TROUBLESHOOTING


STEP BY STEP IP CONNECTIVITY TSHOOT

1. Check Layer-1 for errors or up / down states

2. Check Duplex Mismatches

3. Check MAC addresses

4. Check IP addresses

5. Check ARP tables

6. Check ports

7. Check ACLs

8. Check DNS


7.2 SPAN


SPAN OVERVIEW

• Switched Port Analyzer

• Cisco IOS tool used for troubleshooting

• Feature of the Cisco Catalyst series

switches that extends the monitoring

capabilities of existing network

analyzers into a switched ethernet

environment


SPAN OVERVIEW

• Mirrors the traffic at one switched

segment onto a predefined SPAN

port

• A network analyzer attached to the

SPAN port can monitor traffic from

any of the other Catalyst switch

ports


SPAN TYPES

• Local SPAN : Mirrors traffic

between interfaces on the same

switch

• Remote SPAN : Allows to monitor

traffic from source ports distributed

over multiple switches

• Encapsulated Remote SPAN : Out

of our scope… • Remote SPAN (RSPAN)


CONFIGURING LOCAL SPAN

• Configuration verified via "#show monitor" command


7.3 IP SLA


IP SLA OVERVIEW

• Internet Protocol Service Level Agreement

• Cisco proprietary

• IOS feature that allows to collect

information (i.e. response time, latency,

jitter and packet loss) about network

performance in real time


IP SLA CONFIGURATION

R2

R1 R3

10.41.28.2

10.41.29.1


VERIFYING IP SLA CONFIGURATION


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CCNA Troubleshooting

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