Cisco Prime Infrastructure 2.2 Administrator Guide

Planning Network Capacity Changes

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Cisco Prime Infrastructure with Assurance allows you to view and report a variety of key performance indicators that are critical for maintaining and improving your network’s operational readiness and performance quality. This information is especially critical in adapting to ever increasing network loads.

Note To use the features described in this chapter, your Prime Infrastructure implementation must include Assurance licenses. These features are supported on ASR platforms only.

In the following workflow, we take the role of a network administrator who has just been told that a large staff expansion is planned for a branch office. This change will add more users to the branch LAN, many of whom will be using WAN applications. We want to monitor the branch’s key interfaces for usage and traffic congestion, so we can see if more users on the branch LAN will mean degraded WAN application performance for those users. To be certain we have an adequate picture, we will need to look at both short- and long-term performance trends for all the WAN applications the branch uses.

Before You Begin

• Set up the Top N WAN Interfaces by Utilization dashlet:

a. Choose Monitor > Monitoring Policies and c reate an Interface Health template.

b. Choose Inventory > Grouping > Port , select the interfaces and click Add to Group , then select WAN Interfaces as the group.

• Enable SNMP polling (see Enabling SNMP Polling in the Cisco Prime Infrastructure 2.2 User Guide ).

Step 1 Choose Dashboard > General .

Step 2 To view the usage statistics for the WAN interfaces on the routers connecting remote branches to the WAN, choose Dashboards > Network Interface and if it is not already there, add the Top N WAN Interfaces by Utilization dashlet (see Adding Dashlets in the Cisco Prime Infrastructure 2.2 User Guide ).

For each interface, this dashlet shows the site, the IP of the device hosting the WAN interface, the interface name, maximums and average utilization, and the utilization trend line for the past 24 hours.

Step 3 To see the utilization statistics for the past month, set the Time Frame on the Filters line to Past 4 Weeks .

Step 4 Find the WAN interface for the branch to which you are adding users. In the Interface column, click the interface’s name to display that interface’s dashboard. The interface dashboard shows the following for this single interface:

• Interface Details
• Top Applications by Volume
• Number of Users Over Time
• Class Map Statistics
• Interface Tx and Rx Utilization
• Top N Clients (In and Out)
• DSCP Classification
• Top Application Traffic Over Time

Step 5 Concentrate on Top Application Traffic Over Time , which gives a color-coded map of the top ten applications with the heaviest traffic over this interface.

Step 6 To get a better idea of the longer-term performance trend, click the Clock icon next to the dashlet title to change the Time Frame to Past 24 Hours , Past 4 Weeks , or Past 6 Months . To zoom in on particular spikes in the graph, use the Pan and Zoom handles in the lower graph.

Step 7 For a quick report of the same data as the interface dashboard, choose Reports > Report Launch Pad . Then choose Performance > Interface Summary . Specify filter and other criteria for the report, select the same interface in Report Criteria, then click Run .

Table 15-1 shows the ISP profile used to test against (it is very similar to the Caida.org Internet profile).