network availability measurement
TRANSCRIPT
Prepared by INS SaputraCCNA | CCNP | MTI
Trouble Ticketing :
Manual Problem Record
Automated Fault Management
Events :
Log Alarm
Device Reachability :
ICMP (PING)
Link and Device Status :
SNMP Polling and Trapping
Advantages Easy to operate
No additional traffic on network
Problem can be categorized base on event
Disadvantages Result can be subjective or inconsistent
Probem may be not recorded in the trouble ticketing system
Need resources to process data and create reports
Exampe: Network Provider Touble Ticketing System
Advantages Problem duration and scope can be fairly accurate
Can be implemented within a NMS fault management system
No additional traffic on network
Disadvantages Requires an excellent change management/
provisioning process
Requires an efficient and effective fault management system
Requires a custom development
Does not account for routing problems
Not a “true” end-to-end measure
Exampe: Devices Network Management System
Advantages Fairly accurate “network availability”
Accounts for routing problems
Fairly low additional traffic on network
Disadvantages Point to multipoint network implies not “true” end-to-
end measure
Availability limited by ping frequency
Maintenance of device database must have a solidchange management and provisioning process
Not accurate for high network traffic usage
Exampe: Gasper Vantage
WhatsUp
Advantages Problem duration and scope can be fairly accurate
Utilize existing NMS systems
Low additional traffic on network
Disadvantages Requires a custom development
Maintaining element device database challenging
Requires an excellent change management and provisioning process
Does not account for routing problems
Not a “true” end-to-end measure
Exampe: HP OpenView
Cisco Network Management System
Passive: no additional traffic on network Trouble Ticketing
Automated Fault Management Events
Active: sending traffic on network ICMP (PING)
SNMP Polling and Trapping
Source : Availability Measurement, Session NMS-2201, Cisco Networkers 2004
