H3C Technologies H3C Intelligent Management Center - Manual (Page 128)

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5 VLAN monitoring
This chapter of the NTA administrator guide provides you with information on VLAN monitoring in NTA,
including how NTA analyzes network flow records report on network traffic from VLAN perspective. This
chapter describes the reporting options for VLAN traffic analyses and reviews configuration issues
around VLAN monitoring and traffic analysis tasks and the reports they generate. This chapter also
describes the process for adding VLAN traffic analysis tasks, including instructions for adding, modifying,
and deleting tasks from NTA. It also provides a survey of the summary reports for all VLAN tasks and a
look at the more granular reports for an individual VLAN traffic analysis task.
VLAN traffic analysis overview
VLAN traffic analysis tasks analyze network flow data by the VLAN you specify in VLAN traffic analysis
tasks. NTA parses all network flow data and provides statistical views of traffic in a VLAN traffic analysis
task. For example, NTA provides source and destination host information reporting by VLAN, displaying
the rate of traffic attributed to specific source or destination hosts that send or receive traffic from the
selected VLAN.
In general, the NTA VLAN traffic analysis tasks provide traffic statistics for the VLAN configured in every
VLAN traffic analysis task. The VLAN traffic reports include rate of traffic for all VLANs in all tasks, for all
VLANs in each task, and for individual VLANs in a task. VLAN statistics include traffic rate by application,
source host, destination host, and a session or source/destination host pair. These reports are organized
in layers from summarized information for all tasks to detailed reporting for specific VLANs configured
for an individual VLAN traffic analysis task.
To use VLAN traffic analysis, follow these guidelines:
• To collect VLAN traffic statistics, the traffic direction (incoming or outgoing) must be identified.
Otherwise, the traffic is counted repeatedly. NTA globally controls the direction of VLAN traffic
through parameter management. By default, the incoming VLAN traffic statistics are collected.
• VLAN traffic analysis is available on only devices supporting sFlow. The NetFlow and NetStream
traffic statistics packets do not carry VLAN tags.
VLAN traffic analysis reporting overview
After you create the first VLAN traffic analysis task, NTA creates an entry called VLAN Traffic
Analysis Task under the Traffic Analysis and Audit area on the left navigation tree.
Click VLAN Traffic Analysis Task on the left navigation tree to view the summary report for all VLAN
traffic analysis tasks.
Move your mouse pointer to the shortcut menu icon to the right of VLAN Traffic Analysis Task. The
VLAN Traffic Analysis Task shortcut menu appears to display all VLAN traffic analysis tasks created in
NTA. Click the name link for a task to view the VLAN traffic analysis report of the task.
To view the VLAN traffic analysis report of a VLAN in a VLAN traffic analysis task, click the Expand icon
next to the task on the shortcut menu to display the all VLANs in the task. Click the name link for a
VLAN to view the VLAN traffic analysis report of the individual VLAN.
The summary VLAN traffic analysis report provides the following information: