ccna network monitoring

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6- Network Monitoring

6.1 Syslog

6.2 SNMP

6.3 Netflow


6.1 Syslog


SYSLOG OVERVIEW

• Standard for message logging

• Used for system management and security

auditing as well as general informational,

analysis, and debugging messages.

• Each message is labeled with a facility

code, indicating the software type

generating the message, and assigned a

severity label


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SYSLOG SEVERITY LEVELS


SYSLOG MESSAGE FORMAT

• Timestamp appears only if "service timestamp" command is configured


SYSLOG SERVER

• Logging to a central syslog

server helps in aggregation of

logs and alerts

• Administrators can easily

navigate the large amount of

data compiled on a syslog

server


DISPLAYING SYSLOG MESSAGES


6.2 SNMP


SNMP OVERVIEW

• Simple Network Management Protocol

• Protocol for collecting and organizing

information about managed devices on

IP networks and for modifying that

information to change device behavior

• Used in network management for

network monitoring


SNMP OPERATION

• GetRequest : A manager-to-agent request to

retrieve the value of a specific MIB

(Management Information Base ) variable

• GetNextRequest : A manager-to-

agent request to retrieve next instance value

of MIB variable

• SetRequest: A manager-to-agent request to

change the value of a variable or list of

variables


SNMP OPERATION

• GetResponse : Returns variable

bindings and acknowledgement

from agent to manager

• Trap : Asynchronous notification

from agent to manager. SNMP traps

enable an agent to notify the

management station of significant

events by way of an unsolicited SNMP

message


SNMP VERSIONS

• SNMPv1 : Initial implementation of the

SNMP protocol.

• SNMPv2 : Revises version 1 and includes

improvements in the areas of

performance, security and confidentiality

• SNMPv3 : Primarily added security and

remote configuration enhancements to

SNMP (authenticates and encrypts

packets )

SNMP


SNMP COMMUNITY STRING

• Text string that acts as a password.

• Used to authenticate messages that are

sent between the management station and

the device

• Used in SNMPv1 and SNMPv2


SNMP COMMUNITY STRING TYPES

• RO (Read Only): You can Access to MIB

but can't make any change

• RW (Read Write): You can access to MIB

and you can change it


CONFIGURING SNMPv3


VERIFYING SNMPv3 CONFIGURATION


6.3 Netflow


NETFLOW OVERVIEW

• Feature that was introduced on Cisco

routers that provides the ability to collect

IP network traffic as it enters or exits an

interface

• By analyzing the data provided by

NetFlow, a network administrator can

determine things such as the source and

destination of traffic, class of service, and

the causes of congestion.


CONFIGURING NETFLOW


VERIFYING NETFLOW CONFIGURATION


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