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Monitoring the performance of the router and connections is an important management task. If the router or links are not performing efficiently, they could cause problems for users or could signal a larger problem in your network. This topic contains the following sections:
To monitor the performance of a particular interface, load MONITOR and follow this path:
Select LAN/WAN Information > interface you want to view
Check the following fields:
Consistently high values in these fields indicate that the link is busy and that performance has probably degraded. In this case, consider using a higher line speed. Note that occasional increases in the values for these fields are normal in all networks.
You can determine the quality of a PPP WAN link by loading PPPCON and selecting PPP Interfaces.
If the Exceptions field in the PPP Interfaces window shows a value other than 0, select the interface, then PPP Error Statistics. A high value in the Bad FCS Values counter indicates problems on a link.
Select the interface you want to view. If LAPB and Data Compression is enabled, select LAPB Interface Information > Traffic Flow Statistics
High values in the Transmit REJs, Receive REJs, and T1 Timeout counters indicate a poor connection.
You can also determine the quality of the link by checking the following counters in MONITOR:
The higher the values of the counters, the lower the link quality. If only the LAPB Retransmission counter is high, use NIASCFG to adjust the T1 timer to a larger value.
The LAPB parameters are meaningful only if PPP data compression is enabled and successfully negotiated with the remote PPP peer.
NOTE: High values for the Receive CRC Errors and Receive Aborts statistics are normal if the Dialing Mode parameter is set to V.25bis.
To determine whether the PPP data link is congested, load PPPCON and follow this path:
Select PPP Interfaces > interface you want to view > General Interface Information
The Interface Statistics window is displayed.
Look at the Queue Length fields. If these fields consistently contain a high value, consider using a higher bandwidth modem or leased line. Occasional increases in the amount of WAN traffic are normal for any network.
To determine the traffic utilization for an interface, load PPPCON and follow this path:
Select PPP Interfaces > interface you want to view
Look at the Receive Utilization and Transmit Utilization fields. These numbers can exceed 100 percent if you have compression turned on.
To determine the traffic utilization for a PPP Multilink interface, load PPPCON and follow this path:
Select PPP Interfaces > interface you want to view > PPP Multilink Group Information
The Aggregate Receive and Transmit Utilization percentage values represent the sum of the utilization of all active links in the Multilink group.
The Average Receive and Transmit Utilization percentage values represent the average utilization of all active links in the Multilink group.
To determine the number of links in a PPP Multilink group, load PPPCON and follow this path:
Select PPP Interfaces > interface you want to view > PPP Multilink Group Information
Table 14 shows the fields of the PPP Multilink Group Information window needed to determine the number of links in a PPP Multilink group. For more detailed information, please refer to PPP Multilink Information.
Table 14. PPP Multilink Information
You can determine the available bandwidth of the PPP link for an active interface by loading PPPCON and following this path:
Select PPP Interfaces > interface you want to view > General Interface Information
The Interface Statistics window is displayed.
Look at the Speed field. Note that for an asynchronous line, the value might not reflect the real bandwidth; the real bandwidth might be 80 percent or less than the apparent value.
You can also check the available bandwidth by loading MONITOR and looking at Interface Speed under Custom Statistics.
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