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# eSight V300R009C00 Operation Guide 09

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FAQs

### FAQs

This section describes questions frequently asked by users, helping users rectify problems in a timely manner.

#### How Do I View the Traffic Stacked Area Chart on the Traffic Analysis Page

##### Question

How do I view the traffic stacked area chart on the traffic analysis page?

Figure 12-25 Application traffic stacked area chart

The stacked area chart is a special area chart used to compare multiple objects within a time range. It stacks multiple data series and displays the change trend of each value. The start point of each data series is drawn based on the previous data series. That is, the area of the second statistical object is drawn from the upper edge of the first object. For example, in the figure, the green area at the bottom indicates the application HTTP and the blue area indicates the SFTP. The blue area is drawn from the upper edge of the green area. You can intuitively analyze the whole-part relationship of each variable and view the percentage of each type of traffic to the top traffic.

In the table, the conversion relationships between packet units are as follows:

1 K = 1000

1 M = 1000 K

1 G = 1000 M

1 T= 1000 G

The conversion relationships between traffic units are as follows:

1 KB = 1024 B

1 MB = 1024 KB

1 GB = 1024 MB

1 TB = 1024 GB

#### What Is the Algorithm of Interface or Interface Group Usage on the Flow Analysis Page

##### Question

What is the algorithm of interface or interface group usage on the flow analysis page?

• Interface usage = The actual rate of interface/rate defined by interface configuration page
• Interface group usage = sum of the actual rate of interface/sum of all interface of group defined rate

#### How Do I Set a Sampling Ratio for an Interface on eSight

##### Question

How do I set a sampling ratio for an interface on eSight?

After you set a sampling ratio for an interface on the device, you need to perform the same configuration on eSight. For example, after you set the sampling ratio of an interface to 10 on the device, you need to log in to the Interface Configuration page on eSight, modify interface parameters, and set the sampling ratio of the same interface to 10.

#### What Sampling Ratio Is the Most Appropriate

##### Question

What sampling ratio is the most appropriate?

In most cases, you can use the default sampling ratio of devices, for example, 1000 for switches. However, you are advised to set the sampling ratio to 1 when the device traffic is small. When the sampling ratio is set to 1, traffic collection is the most accurate.

#### Why the Inbound Or Outbound Interface Is Displayed as Unknown in the Traffic Forensics Result

##### Question

Why the inbound or outbound interface is displayed as unknown in the traffic forensics result?

The inbound or outbound interface of packets is not monitored by eSight NTA or the packets are broadcast packets with the interface ID 0.