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You use traffic-level segment monitoring applications to examine different aspects of network operation. You should first use a multisegment, multidomain tool such as Traffic Monitor to get a general idea of the portion of your network you want to monitor, then use the single-agent, single-domain applications to focus on the portion you want to examine more closely.
You use the following applications together to monitor and understand the traffic on a specific segment:
Working with single agent or domain applications is a little different from working with other multisegment, multidomain applications. For example, as a general rule of thumb, you can launch most of the statistics applications from the Traffic level of the TrafficDirector main window. You can launch Segment Zoom and Segment details for any individual agent, switch port, DLCI, and generic domain combination.
You can use the Segment Zoom application to see a graphical representation of traffic information for a generic domain retrieved from an agent, switch port, or Frame Relay agent DLCI. Segment Zoom uses bar, pie, and line graphs to display information about utilization percentage, various packet rate statistics, and short-term and long-term history statistics for the agent and domain combination you select. Depending on the topology (Ethernet, Token Ring, or WAN) or type of device (agent, switch, or Frame Relay) you select, the information displayed in Segment Zoom changes. Table 18-1 lists the type of information you see.
| Device | Display |
|---|---|
| Agent on an Ethernet segment | Utilization %, Collision Rate, Packet Size, Packet Destination, Short-Term and Long-Term Segment History |
| Agent on a fast Ethernet segment | Utilization % for both DTE and DCE, Packet Size, Packet Destination, Short-Term and Long-Term Segment History for both DTE and DCE |
| Switch port | Utilization %, Collision Rate, Packet Size, Packet Destination, Short-Term and Long-Term Segment History |
| Agent on a ring-based segment (Token Ring, FDDI, or CDDI1) | Utilization %, Token Packet Rate, Packet Size, Packet Destination, Short-Term and Long-Term Segment History |
| Agent on a WAN | Utilization % for both DTE and DCE, Packet Size, Packet Destination, Short-Term and Long-Term Segment History for both DTE and DCE |
| Frame Relay agent DCLI | Utilization % for both DTE and DCE, Packet Size, Packet Destination, Short-Term and Long-Term Segment History for both DTE and DCE |
The Segment Zoom window provides the data displays described in Table 18-2. Segment Zoom displays different variables depending on the device you select. The displays reflect whether the network is Ethernet, WAN, FDDI, or Token Ring; differences are noted in Table 18-2.
| Data Display | Variables |
|---|---|
| Utilization % | Both maximum and current segment utilizations as a percentage of total available bandwidth (10 Mbits/sec). For WAN agents, two utilization % headings are displayed: DTE utilization % and DCE utilization %. Depending on the type of agent selected, these headings are customized for different types. |
| Collision Rate | For Ethernet only, both maximum and current segment collisions as a percentage of packets. |
| Total Packets | For FDDI only, both maximum and current token packet rate. |
| MAC Packet Rate | For Token Ring only, both maximum and current MAC packet rate. |
| Error Packet Rate | For WAN only, both maximum and current error packet rate. |
| Packet Size | Percentages of current and historical packet sizes as pie charts; shows six packet sizes. |
| Packet Destination | Percentages of current and historical packet sizes as pie charts. Unicast, multicast, and broadcast packets are displayed. |
| Segment History | Shows three superimposed graphs: Utilization, Collisions, and Errors. A menu option lets you switch between short-term history and long-term history. Keep in mind that depending on the agent you select, the heading is customized. For example, if you select a Frame Relay agent, the heading defaults to Short-Term DTE Segment History. |
Use the Segment Zoom application to see a graphical representation of traffic information for a single generic domain retrieved from an agent, switch port, or Frame Relay agent DLCI.
To begin monitoring traffic information with Segment Zoom, take the following steps:
Step 1 Select a generic domain, for example, RMON.
Step 1 Select an agent, switch port, or DLCI and launch the Segment Zoom application. See "Launching TrafficDirector Applications" in Chapter 2, "Launching TrafficDirector."
The Segment Zoom window opens (Figure 18-1). Note that the selected agent and domain are displayed at the top of the window. The other three views are similar.
Step 2 Do any of the following:
Step 3 To launch other applications, select Applications, then select from the available applications.
When you launch either a Short-Term or Long-Term History window from the Segment Details application, you can select one of the four available graph formats. Both short-term and long-term history graphs default to the Line graph option when first launched. To change the graph format, select the graph type from the Format menu. The following graph types are available:
Use the Segment Details application to get information specific to the type of network (Ethernet, Token Ring, or WAN) you are monitoring. Launch Segment Details from the TrafficDirector main window, or from within another application, such as Segment Zoom, after you select an agent, switch port, or Frame Relay DLCI and a generic domain.
The information displayed in the Segment Details application is in tabular or text format representing the actual cumulative traffic statistics for a segment. The graphical Segment Zoom application compliments the statistics displayed in Segment Details by translating them into a visual "big picture" of traffic for a segment.
The Segment Details application window is divided into three information areas. The information displayed in each area depends on the menus and options you select.
Table 18-3 lists the types of cumulative statistics you see, depending on the type of device you select (agent, switch port, or DLCI).
| Device | Displayed Cumulative Statistics |
|---|---|
| Agent on an Ethernet segment or fast Ethernet | Utilization %, Bytes, Packets, Broadcasts, Multicasts, Drops, CRC/Aligns, Fragments, Jabbers, Collisions, Oversize packets, Undersize packets, and the distribution of packets that range in size from 64 bytes up to 1518 bytes |
| Multiport agent on an Ethernet segment
| Utilization %, Bytes, Packets, Broadcasts, Multicasts, Drops, CRC/Aligns, Fragments, Jabbers, Collisions, Oversize packets, Undersize packets, and the distribution of packets that range in size from 64 to 127 bytes, to 1518 bytes |
| Agent on a ring-based segment (Token Ring, FDDI, or CDDI) | Utilization %, Bytes, Packets, Broadcasts, Multicasts, Drops, and the distribution of packets that range in sizes from 18 bytes to 18 K |
| Agent on a WAN | Utilization %, Bytes, Packets, Broadcasts, Multicasts, Collisions, CRC Aligns, Fragments, Jabbers, Oversize packets, Undersize packets, Drops, and the distribution of packets that range in size from 64 bytes to 8191 bytes |
| Frame Relay agent DLCI | Utilization %, Bytes, Packets, Broadcasts, Multicasts, Drops, CRC Errors, Discard, BECN; FECN, amount of DLCI Downtime (in seconds), and the distribution of packets that range in size from less than 64 bytes to greater than 1518 bytes |
| Switch port | Utilization %, Bytes, Packets, Broadcasts, Multicasts, Drops, and the distribution of packets that range in size from 18 to 16 bytes, to 18 K plus |
Use the Segment Details application to see actual traffic statistics for a generic domain retrieved from an agent, switch port, or Frame Relay agent DLCI. You can launch Segment Details from the TrafficDirector main window or from within another application.
To use the Segment Zoom application to get information and launch new applications, take the following steps:
Step 1 Launch the Segment Details application. See Chapter 2, "Launching TrafficDirector."
The Segment Details window opens (Figure 18-2).
Step 2 Select View to determine the type of statistics displayed. For Token Ring segments, select promiscuous statistics (default), MAC errors, or Ring Information. For a Frame Relay agent on a WAN segment, select DTE, DCE, or DTE+DCE (default) statistics.
Step 3 Select Refresh, then select a data sample rate. Sample rates range from 15 seconds to 2 minutes. The default is 1 minute.
Step 4 To launch other applications, select Applications, then select from the available applications.
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