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Modifying Collection Parameters


Traffic collection settings include (a) global properties like the collection interval, (b) device-specific properties like the collection method, (c) device group properties to specify what to do with the devices in a group if the collector for that group fails, and (d) collector properties.

Global Properties

Click on the Global Network item from the left-pane and set the Traffic collection interval (seconds). (It is best to set it at multiples of 300(sec) – 5 minute interval.). If no value is set for the interval (the interval is set to zero seconds), then “Global Network” will be shown in red, indicating there is still some incomplete information.

Device Properties

Make sure that the Router Type is not GENERIC. It should match the correct hardware vendor family of the router. For certain families within the same vendor, it is necessary to explicitly specify that family. For example, for CISCO ASA devices, the router type CISCO_ASA should be specified rather than CISCO. For Cisco IOS-XR, the router type CISCO_IOX should be specified rather than CISCO.

Figure 1: Router Fields
Router Fields

To specify the Collection Method (SNMP, CLI, Bulkstats), select one or more routers from the left hand side. Then, on the right hand side, double click on the row in the Value column corresponding to Collection Method and choose the method from the drop-down menu. Normally, SNMP is used for the traffic collection method. However, CLI can also be used for Juniper, Cisco, Redback, and ERX as a means of reducing SNMP processing at the routers. Bulkstats is supported for Redback, Juniper, and ERX, and requires a license as well as special advanced configuration. Please refer to Configuring Bulkstats Traffic Collection (Advanced) on page 181 or contact Juniper support for more details on bulkstats.

Make sure that all the SNMP attributes are present in the router profile when SNMP method is chosen and CLI attributes when CLI method is chosen. Specify the exact router type, as the information will be used to send appropriate vendor-specific commands to the router and parse the data collected from them. (Note that for the CLI method, the current supported vendors include Cisco, Juniper, Juniper-ERX and Redback devices.)

By default, the traffic collection will collect both iftable and ifxtable for interface traffic. Select the cell to the right of List of Collection tables to bring up the following window. Here you can additionally specify if you want to collect COS (class of service) and MCAST (multicast) traffic. Options may vary depending upon the hardware vendor. Additionally, if you want to collect only iftable and not ifxtable, you can uncheck IFX.

Figure 2: Choose Collection Tables
Choose Collection Tables

Some of the dependency relationships are described at the bottom of this window. Note also that certain categories are only available for SNMP collection method.

The Max Collection Time (seconds) is used to set the max collection timeout. For a router with a lot of interfaces, tunnels, and VPNs, it is better to set this number to high value.

Router Group Properties

Click on each Router Group to configure settings related to the router groups, as shown in the following image.

  • Enable Router Group Failure:If this checkbox is selected, it means that if the traffic data collector for this group fails, this group can be reassigned to be collected by another collector. This option should be unselected for a group of routers which is collected using Bulkstats. It should also be unselected if you want to avoid collecting for this group of routers and have stopped the traffic data collector on purpose.

  • Is this Group for Bulkstats Collection?:Select yes, if this group is being used for Bulkstats collection. Routers that are to be collected using the bulkstats method should be added to groups with this checkbox selected.

  • Do not split Group on Failover:This option is only effective when you check the above Enable Router Group Failover option. Checking this option, all the routers in a group will be switched together as a group into the same active group during collector failures. Otherwise, the routers will be distributed to several active groups when you leave the option unchecked.

    Figure 3: Router Group Settings
    Router Group Settings

Traffic Collector Properties

  • Maximum # of collection threads: The max number of parallel threads can be executed at the same time. The default value is 20.

  • Maximum collection wait queue size:The queue used to store collection jobs (in general, one router element collection is one job) to be processed by traffic data collector threads. The default value is 200.

Save all changes before starting data collection, by pressing the Save button (the diskette icon).