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You can use traffic-level segment monitoring applications to examine different aspects of network operation.
The following sections provide information about working with segment information:
To get a basic idea of the portion of your network you want to monitor, you first use a multisegment, multidomain tool such as Traffic Monitor. You would then use the single-agent, single-domain applications to focus on the portion you want to examine more closely.
You can use the following applications together to monitor and interpret the traffic on a specific segment:
To use Segment Zoom, follow these steps:
Step 1 Click the Traffic radio button in the TrafficDirector main window.
Step 2 Click Agent, Switch, or Frame Relay.
Step 3 Do one of the following:
Step 4 Select a generic domain from the Domain Name list box.
Step 5 Click the Segment Zoom icon.
The Segment Zoom window for the selection you made opens (Figure 18-1).
The following sections contain more information about working with the Segment Zoom window:
Table 18-1 describes the data displayed in the Segment Zoom window (depending on the device you selected).
| This Field Displays... | This Information |
|---|---|
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 you 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 the maximum and current error packet rate. |
Packet Size | Percentages of both current and historical packet sizes as pie charts; shows six packet sizes. |
Packet Destination | Percentages of both current and historical packet sizes as pie charts. Unicast, multicast, and broadcast packets are displayed. |
Segment History | Segment history as three superimposed graphs--- Utilization, Collisions, and Errors. Selections under the View menu let you switch between Short- and Long-Term History. 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. |
DTE Utilization % | For ATM, the average percentage of bandwidth utilization on the DTE network during the sample interval. |
DCE Utilization % | For ATM, the average percentage of bandwidth utilization on the DCE network during the sample interval. |
Packet Size | For ATM, a pie chart display that shows the percentage of different packet sizes within the last sampled interval. |
Packet Destination | For ATM, a pie chart display that shows the percentage of unicast, multicast, and broadcast packets. |
Short-Term DTE Segment History | For ATM, any one of the history sections displays a line chart which shows utilization and error percentage. |
The following sections describe the other types of displays you can use with Segment Zoom:
To display the percentage (numerical value) that a segment of a pie chart represents, follow these steps:
Step 1 Click the segment.
A pop-up window opens (Figure 18-2) with the percentage information about the selected segment.
Step 2 Click OK to close the pop-up window.
You can change the History Display on the Segment Zoom window by selecting View>Short-Term History or View>Long-Term History from the menu bar.
To display the percentage value for a point on a graph, click the specific point on the graph. The numerical value represented by the point is displayed in the gray status bar at the bottom of the Segment Zoom window (Figure 18-3).
You can use Segment Details to display in a real-time, tabular format all 17 statistics counters and the short- and long-term RMON 1 history.
You can start Segment Details from the TrafficDirector main window, or from within another application like Segment Zoom. You can use Segment Details for an agent, switch port, or Frame Relay agent DLCI and a single generic domain.
To start Segment Details, follow these steps:
Step 1 Click the Traffic radio button in the TrafficDirector main window.
Step 2 Click Agent, Switch, or Frame Relay.
Step 3 Do one of the following:
Step 4 Select a generic domain from the Domain Name list box.
Step 5 Click the Segment Details icon.
The Segment Details window for your selection opens (Figure 18-4).
The Segment Details display is divided into three information areas. The information that is displayed depends on the menus and selection buttons you selected.
Depending on your selections, different kinds of cumulative statistics are displayed. These statistics are described in Table 18-2:
| For This Device... | These Cumulative Statistics Display |
|---|---|
Switch Port | Utilization%, Bytes, Packets, Broadcasts, Multicasts, Drops, and the distribution of packets that range in sizes from 18-16 bytes up to 18K+. |
Agent on an ATM segment | Utilization%, Bytes, Packets, Broadcasts, Multicasts, Drops, distribution of packets that range in sizes from <= 127 bytes up to >= 4096 bytes, CRC Errors, Calls, CallAttempts, CLP Count, F50AMCells, and cells. |
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 ranging in sizes from 64 bytes up to 1518 bytes. |
Multiport agent on an | Utilization %, Bytes, Packets, Broadcasts, Multicasts, Drops, CRC/Aligns, Fragments, Jabbers, Collisions, Oversize packets, Undersize packets, and the distribution of packets that range in sizes from 64-127 bytes up to 1518 bytes. |
Agent on a ring-based segment (Token Ring or FDDI) | Utilization %, Bytes, Packets, Broadcasts, Multicasts, Drops, and the distribution of packets that range in sizes from 18 bytes to 18K. |
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 sizes from 64 up 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 sizes from less than 64 bytes up to greater than 1518 bytes. |
Posted: Mon Apr 5 13:27:58 PDT 1999
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