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This chapter provides information to help you configure and monitor the virtual channels in your ATM network.
You can use the following sections to configure and monitor the virtual channels:
The following terms provide a basic description of virtual channels:
Step 1 From the fabric topology window (Figure 2-5), click the desired link in the topology map.
Step 2 Select Tools>VC List>All Connections, or click VC List from the toolbar.
The VC List window opens (Figure 5-1) listing all the selected virtual channels for the VCC.
You can focus on particular virtual channel types by selecting Tools>VC List>By SVC Addresses. The menu that is displayed provides the following choices:
You can obtain the percentage of available bandwidth used by a particular link. The link utilization value is provided in the Utilization field, as shown in Figure 5-1.
You can obtain the percentage of available bandwidth for the displayed virtual channels by clicking Utilization. The utilization values appear in the Transmit (Tx) column and in the Receive (Rx) column. These values represent the percentage of the available bandwidth that the source device (shown in the From field) used to transmit and receive data. For example, the connection for VPI 0 and VCI 37 in Figure 5-1 is using 30 percent of the available bandwidth to transmit data and 40 percent of the available bandwidth to receive data.
Step 1 From the fabric topology window (Figure 2-5), select a link and display the list of virtual channels on that link.
Step 2 From the VC List window, select a virtual channel.
Step 3 Click Plot Utilization.
The Utilization window opens with the utilization plotted graphically in the form of a trend graph. The Y axis represents the percentage of utilization, and the X axis represents the number of samples over time.
The utilization graph is updated after each polling interval. To configure the utilization polling interval, select Preferences>Options>Polling.
Virtual channel tracing provides a topological span of the virtual channel. The tracing also displays the devices and ports involved in the routing of the virtual channel. After you identify all devices and ports for a virtual channel, you can check them for performance and errors.
A trace report for a selected VPI/VCI shows the starting device and port, the ending device and port, and the distance of the link segment to and from the root. The report includes the devices used to connect the two selected devices. Point-to-multipoint connections have an entry in the table for each connection.
You can use this information to identify the route of a particular virtual channel by tracing the virtual channel from one device to another.
Step 1 Display the desired virtual channels in your ATM network, as explained in "Listing Virtual Channels."
Step 2 From the VC List window, select a virtual channel.
Step 3 Click Trace Report.
The VC Trace Report window opens (Figure 5-2), showing the selected link and the trace report in tabular form.
Step 4 Click Close to close the trace report, or Print to print the trace report.
Step 1 Display the desired virtual channels in your ATM network, as explained in "Listing Virtual Channels."
Step 2 From the VC List window, select a virtual channel.
Step 3 Click Trace Report.
The VC Trace Report window opens.
Step 4 Click Display.
The trace display is shown on the fabric topology map by highlighting the nodes and links. The VPI and VCI values for the link are also displayed on the highlighted links on the map.
A point-to-point trace is represented with the trace from the root to the termination. The tracing is more involved in a point-to-multipoint tracing because at each level the point-to-multipoint branches are explored nonstop until a termination point is reached. This tracing can require a lot of computer resources because each participating device needs to be queried for all possible paths.
Step 1 Select the highlighted trace display on the fabric topology map.
Step 2 Select Admin>Clear Trace.
Step 1 From the fabric topology window (Figure 2-5), select the source and destination links in the topology map.
Step 2 Select Tools>VC List>Between Devices.
The VC List window opens (Figure 5-1) with a list of the virtual channels between the two devices.
You can check the connectivity of virtual channels through the Operation, Administration, and Maintenance (OAM) services. The OAM services provide fault and performance management capabilities at the ATM M-Plane layer. Current OAM implementation in the LightStream 1010 switch includes connectivity verification and alarm surveillance.
You must enable OAM services by using the command line interface (CLI) on the Lightstream 1010 switches.
You can check the connectivity of a virtual channel by triggering an OAM ping.
Step 1 Start the AtmDirector application.
The AtmDirector main window opens (Figure 2-2).
Step 2 Hold down the shift key to select both a LightStream 1010 switch and the adjacent link on which the OAM ping needs to be sent.
Step 3 Select Tools>OAM Ping or click OAM Ping from the toolbar (Figure 2-5).
The OAM Ping window opens (Figure 5-3).
The IP address of the LightStream 1010 switch appears in the Host field, and the port number appears in the Port field. The list of all active VPIs and VCIs appears in the VPI and VCI fields, respectively.
Step 4 Select the VPI and VCI of the virtual channel on which you want to send the OAM ping from the VPI/VCI pull-down list.
Step 5 Enter in the Timeout field the amount of time (in seconds) that the LightStream 1010 switch must wait before determining that the OAM ping has failed. The default is five seconds.
Step 7 Select either Segment or End-End for the Ping Type.
Step 8 If you selected End-End as the ping type, take the following steps:
(a) Select either IP, NSAP Prefix, or None for the Destination Type.
(b) Enter one of the following in the Destination Address field depending upon your selection in the Destination Type field:
IP address---A 32-bit IP address.
NSAP Prefix---First 13 bytes of the ATM address.
None---No entry for the destination address.
Step 9 Click Apply.
To view the results of an OAM ping, trigger an OAM ping. The Ping Report section of the OAM Ping window automatically opens and displays the results.
While the Ping Report section of the window is open, the OAM results are dynamically polled and refreshed.
You can set up soft permanent virtual channels (SPVCs) or soft permanent virtual paths (SPVPs) between two end stations in an ATM network, whether they are displayed on the ATM Fabric map or not.
To set up an SPVC or SPVP, follow these steps:
Step 1 From the AtmDirector main window, select the source and destination link or switch, depending on whether the end station is manageable or not:
(a) To set up an SPVC or SPVP between two manageable end stations, select the source and destination links connected to the end stations.
(b) To set up an SPVC or SPVP between two unmanageable end stations, select the source and destination switch to which the end stations are connected. If the two unmanageable end stations are connected to the same switch, select only that switch.
Step 2 Select Tools>SPVC/SPVP Setup or click SPVC/SPVP Setup from the toolbar.
The SPVC/SPVP Setup window opens (Figure 5-4). You must then click the Advanced Parameters arrow to expand the window.
Step 3 Click the SPVC or SPVP radio button.
The ATM address is automatically filled in, depending on the destination link selected.
Step 4 If you are configuring an SPVC or SPVP between two unmanageable end stations, you need to define the switch ports to which these end stations are connected. Select the ports from the pull-down list in the ATM Port fields.
Step 5 Enter the new VPI and VCI values for the SPVC.
These new values replace the existing VPI/VCI values on the selected interface.
Step 6 Set the SPVC advanced parameters as follows:
(a) Enter the interval between connection retries for setting up SPVC or SPVP in the switch in the Slow Retry Interval field.
(b) Set up Usage Parameter Control values as follows:
Select either Pass, Tag, or Drop. The default is Pass.
Turn Packet Discard On or Off. The default is On.
Click the Save as Default check box to save the SPVC parameters as the default setting.
(c) Click Select... to specify the transmit traffic parameters. The Traffic Descriptor Table window opens displaying all the currently available traffic descriptors (Figure 5-5).
Step 7 Select one of the traffic parameter columns.
When you select a column, the values from that column are filled in the fields below, which explain the meaning of each parameter. Refer to Table 5-1 for an explanation of the traffic parameter fields.
(a) Click Apply.
The values are filled in the Traffic Parameter fields in the SPVC/SPVP window.
(b) In the SPVC/SPVP window, specify the receive traffic parameters by selecting the Rx. Traffic Parameters field.
(c) Repeat Steps 7 and 7(a).
(d) Click Close to close the Traffic Descriptor Table window.
The Route Optimization Parameters window opens (Figure 5-6).
Routing is done automatically for Soft PVCs. If a fault occurs along the path of an SPVC or SPVP, a different path is reestablished automatically. Configuration is not required to turn this feature on.
The SPVC/SPVP route optimization feature returns connections to shorter paths when the original paths come back up. This step is done by periodically checking the administrative weight of the current path against the administrative weight of the best path seen by the PNNI process. You must configure this feature for it to take effect. You can configure the period and time-of-day interval to avoid routing to different paths and disrupting the network during peak hours.
Step 9 Configure the fields in the Route Optimization Parameters window as follows:
(a) Click the Route Optimize check box to configure route optimization for the interface.
(b) Click Soft PVC to set the interface type to SPVC.
(c) Set the number of minutes for the Optimization Interval using the Minutes pull-down list.
The default is 10 minutes.
(d) Set the start and end times for the route optimization by sliding the bars to the corresponding start and end times on the timeline.
(e) Take one of the following actions:
Click Apply to apply the currently displayed settings or click Cancel to return to the SPVC/SPVP window without applying the settings.
Step 10 Click Apply in the SPVC/SPVP window.
The configuration request is sent to the source switch. Error messages are displayed in a popup window.
| Field | Explanation |
|---|---|
QoS | Quality of service |
PCR (0+1) | Peak cell rate, in cells per second, for cells with cell loss priority 0 or 1 |
PCR (0) | Peak cell rate, in cells per second, for cells with cell loss priority 0 |
SCR (0+1) | Sustained cell rate, in cells per second, for cells with cell loss priority 0 or 1 |
SCR (0) | Sustained cell rate, in cells per second, for cells with cell loss priority 0 |
CDVT | Cell delay variation tolerance in cell-times |
MBS | Maximum burst size in cells |
MCR | Minimum cell rate in cells per second |
To configure interfaces on switches, follow these steps:
Step 1 From the AtmDirector main window, select the switch containing the interface or the switch and link that you want to configure.
Step 2 Select Tools>Interface Configuration.
The Interface Configuration window opens (Figure 5-7).
Step 3 If you selected only a switch from the AtmDirector main window, select the interface to configure using the pull-down window in the ATM Port/Interface field. If you selected a switch and link from the AtmDirector main window, the interface number is automatically displayed in the ATM port/Interface field.
Step 4 Configure the Interface Parameters as follows:
(a) Select either Enable or Disable for Signalling.
(b) In the Interface Type field, select the type of interface from the pull-down window. Valid types are PNNI, IISP, UNI, NNI PVC Only, and Others.
(c) In the Interface Side field, select the side of the interface that you are configuring from the pull-down window. Valid values are User, Network, and Not Applicable.
(d) In the UNI Signalling Version field, select the version from the pull-down window.
Step 5 Configure the Link Selection and Administrative Weight parameters.
Table 5-2 provides the field descriptions.
| Field | Description |
|---|---|
Link Selection | Specifies the method for selecting a link for constant bit rate and variable bit rate call setups. Options are as follows:
|
| Administrative Weight |
|
CBR | Administrative weight for the constant bit rate service category. |
rtVBR | Administrative weight for the real-time variable bit rate service category. |
nrtVBR | Administrative weight for the non-real-time variable bit rate service category. |
ABR | Administrative weight for the available bit rate service category. |
UBR | Administrative weight for the unspecified bit rate service category. |
| Default CDVT |
|
CBR | Cell delay variation timings for CBR. |
ABR | Cell delay variation timings for ABR. |
UBR | Cell delay variation timings for UBR. |
rtVBR | Cell delay variation timings for rtVBR. |
nrtVBR | Cell delay variation timings for nrtVBR. |
CDVT in Cell Time | Maximum burst size for CDVT (in cell time). |
MBS in Cell Time | Maximum burst size (in cell time). |
Step 6 Click Route Optimization... in the Interface Configuration window (Figure 5-7) to configure the routing parameters for the SPVCs or SPVPs originating from the source interface.
The Route Optimization Parameters window opens (Figure 5-6). Configure the field as follows:
(a) Click the Route Optimization check box to configure route optimization for the interface.
(b) Click Soft PVC to set the interface type to SPVC.
(c) Set the number of minutes for the Optimization Interval using the Minutes pull-down list.
The default is 10 minutes.
(d) Set the start and end times for the route optimization by sliding the bars to the corresponding start and end times on the timeline.
(e) Take one of the following actions:
Step 7 Click OK to apply the configuration to the interface.
Posted: Thu Sep 30 11:30:45 PDT 1999
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