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Monitoring domain traffic is essential for a clear picture of what is happening on your network. TrafficDirector is shipped with an RMON domain, which counts all traffic on the network, regardless of the protocol, as well as a number of predefined standard domains. Usually, TrafficDirector domains are protocols. However, some domains are defined to reflect devices (such as a server) or applications (such as a proprietary protocol developed by your organization). Recall that a domain is simply any portion of network activity that is defined and monitored according to your needs. You can use the applications described here to display all the domains that are currently installed on an agent and get information about traffic for each domain. See Chapter 14, "Domains."
When you use agents or agent groups to monitor network traffic, you must install the domains before you can begin monitoring specific traffic. You can install one or more domains on an agent. You can also specify a domain and install it on all the agents connected to your network.
For example, if you use domain IP to monitor just IP traffic, you can install it on both agent NYC, located in New York City, and on agent PARIS, located in Paris, Texas. You can then monitor IP traffic on both segments from your TrafficDirector console. If you also want to monitor all Telnet and FTP traffic on just the Paris segment, you would define these two protocols as the TELNFTP domain and install it on the PARIS agent. This gives you the following options for monitoring the Paris segment:
By monitoring the traffic on your network, you can establish a baseline of normal or expected performance and note any deviations that might signal broader network problems.
Once you have defined a domain, you can use it to collect, view, and analyze network data associated with that domain. As described earlier, you must first use the Configuration Manager to install a domain on one or more agents, agent groups, or switches connected to the segment you want to monitor. Using the Domain Editor application, you can define new domains that are meaningful to the network usage in your organization.
You can use Domain Discovery to do the following:
You can launch Domain Discovery directly from the Traffic, Protocol, and Application levels of the TrafficDirector main window by selecting the agent and domain combination you want and clicking the Domain Discovery icon. You can also launch it from within certain applications by selecting Applications>Domain Discovery.
To select Domain Discovery, take the following steps:
Step 1 Select the agent, switch port, or DLCI.
Step 2 Click the Domain Discovery icon in the TrafficDirector main window.
The Domain Discovery application window (Figure 28-1) opens.
Table 28-1 lists the various statistics displayed in the Domain Discovery window.
| Statistic | Description |
|---|---|
| Domain | All domains installed on the agent. |
| Groups | Whether statistics, hosts, or conversations are enabled on the agent. |
| Buckets SH | Number of buckets used to track short-term history for the selected domain. |
| Buckets LH | Number of buckets used to track long-term history for the selected domain. |
| Intervals SH | Interval (in seconds) in which the agent fills the short-term history buckets. |
| Intervals LH | Interval (in seconds) in which the agent fills the long-term history buckets. |
| TotalPkts | Total packets seen for this domain since the agent has been booted. |
| TotalBytes | Total number of bytes for this domain. |
| Util% | Average percentage of network utilization for the specified domain. |
| PktRate | Packets per second on the network segment that meet the requirements of the specified domain. |
Domain History is a graphical application--it displays multicolored graphs of the statistics that you want to view. You can click any point on the graph to display the exact percentage or value that point represents. Domain History can be launched one of two ways--either directly from the Traffic level of the TrafficDirector main window, or from the Domain Discovery application by selecting Applications>Domain History.
To launch Domain History from the TrafficDirector main window, take the following steps:
Step 1 Select the agent, switch port, or DLCI and domain that you want to display.
Step 2 Click the Domain Discovery icon in the TrafficDirector main window.
The TrafficDirector Domain History window (Figure 28-2) for the domain you selected opens.
Step 3 Click a point or bar in the graph to display the value it represents in the status bar (Figure 28-3) at the bottom of the window.
You can display graphs for the following statistical information in Domain History:
To change the statistics displayed in the Domain History window, select a statistic from the View menu.
Domain History automatically defaults to the line graph format when you launch it, but for certain types of information, such as Vital Signs, line graphs may not always provide the easiest to understand representation of the information you are viewing. You can change the format for any Domain History graph by selecting one of the following available formats:
To change the format of the graph displayed in the Domain History window, select a graph type from the Format menu.
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