User guide

10-2
Cisco Media Gateway Manager 5.0 User Guide
OL-5461-02
Chapter10 Managing Performance
What Performance Data Is Available?
The performance management process is as follows:
1. Gather network data and statistics
2. Analyze network performance and identify network critical issues
3. Optimize network performance
4. Plan customer capacity
5. Plan network capacity
10.2 What Performance Data Is Available?
The following areas of performance are useful for measurement:
• Availability—The amount of time for which a network system or application is available to the user.
From a network perspective, availability is the reliability of the individual components in the
network. Accurately measuring availability of a distributed network is difficult and not very
practical.
• Accuracy—The amount of interface traffic that does not result in error. Accuracy can be expressed
in terms of a percentage that compares the success rate to the total packet rate over a period of time.
A decreased accuracy rate should be used to trigger a closer investigation of the network.
• Utilization—Measures the use of a particular resource over time. Utilization is usually expressed as
a percentage of a resource's maximum operational capacity. It can be used to identify congestion or
potential congestion throughout the network, as well as underutilized resources. Sudden jumps in
resource utilization can indicate a fault condition.
With Cisco MGM, you can view performance management data sorted by:
• NE model
• Performance management type
• Performance management category
Note An alarm is generated for every piece of lost performance management data for the Cisco MGX8880, or
Cisco MGX8850. A PM Lost Alarm 15 Min is generated when Cisco MGM is unable to collect
performance management data for 15 minutes when the NE’s performance management collection is
enabled. If there are outstanding performance management 15 Min Retrieval Fail Alarms, these alarms
are manually cleared and the performance management 15 Min Lost performance management Bucket
Alarm is generated.
Note Make sure that the NE and the Cisco MGM server are synchronized. The NE generates performance
management statistics at 15-minute intervals.
Cisco MGM also collects statistics which can be viewed using the Statistics Report. Statistics are
numerical values derived from the contents of event counters that are located on the service modules in
the switch. The counters record the number of occurrences for a particular network event. A single
switch contains separate counters for hundreds of discrete network events.
The event counters on the service modules continue to accumulate the counts of network events whether
or not the counters are ever read by an Operator or collected by the Cisco MGM station. If the content
of a counter is read by you or by another application, the counter value is defined as a statistic. A single