Collecting Statistics About IPv4 Aggregated Flows
Before collecting statistics about IPv4 aggregated flows, familiarize yourself with the usage scenario, complete the pre-configuration tasks, and obtain the data required for the configuration.
Usage Scenario
On the network shown in Figure 1, a carrier enables NetStream on the router functioning as a NetStream Data Exporter (NDE) to obtain detailed network application information. The carrier can use the information to monitor abnormal network traffic, analyze users' operation modes, and plan networks between ASs.
Statistics about NetStream aggregated flows contain information about original flows with the same attributes, whereas statistics about NetStream original flows contain information about sampled packets. The volume of aggregated flow statistics is greater than that of original flow statistics.
Pre-configuration Tasks
Before collecting statistics about IPv4 aggregated flows, complete the following tasks:
Configure static routes or enable an IGP to implement network connectivity.
Enable statistics collection for NetStream original flows.
- Specifying a NetStream Service Processing Mode
- After sampling packets, each NetStream-enabled interface board sends sampled packets to the NetStream service processing board for aggregation and output. If the NetEngine 8000 F has more than one NetStream service processing board, these NetStream services boards work in redundancy mode to back up each other and balance traffic, which improves system reliability.
- Configuring an Aggregation Mode for IPv4 Flows
- Configuring an aggregation mode is to specify an attribute type for original flows to be aggregated. Original flows with the same attributes can be combined into a single aggregated flow based on a specified aggregation mode and output to the NetStream Collector (NSC).
- Outputting Aggregated Flows
- To ensure that aggregated flows are correctly output to the NMS, specify the aging time, output format, and source and destination addresses for aggregated flows.
- (Optional) Adjusting the AS Field Mode and Interface Index Type
- Before the NetStream Collector (NSC) can properly receive and parse NetStream packets output by the NetStream Data Exporter (NDE), the AS field modes and interface index types configured on the NDE must be the same as those on the NSC.
- (Optional) Configuring NetStream Interface Option Packets and Setting Option Template Refreshing Parameters
- This section describes how to configure NetStream interface option packets and set option template refreshing parameters.
- Sampling IPv4 Flows
- You can enable NetStream to sample and analyze the incoming or outgoing flows on an interface.
- Verifying the Configuration of Statistics Collection of IPv4 Aggregated Flows
- In routine maintenance or after pertaining configurations of NetStream are complete, you can run the display commands in any view to check whether NetStream is enabled on the device.