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Netstream export formats, Netstream filtering and sampling, Netstream filtering – H3C Technologies H3C MSR 5600 User Manual

Page 194: Netstream sampling, Netstream configuration task list

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In an aggregation mode with AS, if the packets are not forwarded according to the BGP routing table,

the AS number cannot be obtained.
In the aggregation mode of ToS-BGP-nexthop, if the packets are not forwarded according to the BGP

routing table, the BGP next hop cannot be obtained.

NetStream export formats

NetStream exports data in UDP datagrams in one of the following formats:

Version 5—Exports original statistics collected based on the 7-tuple elements and does not support
the NetStream aggregation data export. The packet format is fixed and cannot be extended

flexibly.

Version 8—Supports the NetStream aggregation data export. The packet format is fixed and
cannot be extended flexibly.

Version 9—Based on templates that can be defined according to the template formats defined in

RFCs. The template feature supports the NetStream aggregation data export and different statistics,
such as BGP next hop and MPLS information.

NetStream filtering and sampling

NetStream filtering

NetStream filtering is implemented by referencing an ACL. NetStream filtering enables a NetStream

module to collect statistics on packets that match the criteria. The filtering allows for selecting specific

packets for statistics purposes. For more information about ACL, see ACL and QoS Configuration Guide.

NetStream sampling

NetStream sampling basically reflects the network traffic information by collecting statistics on fewer

packets. The reduced statistics to be transferred also avoid the impact on the device performance. For
more information about sampling, see "Configuring samplers."

NetStream configuration task list

When you configure NetStream, choose the following configurations as needed:

Make sure which device you want to enable NetStream on.

If multiple service flows are passing the NDE, use an ACL to select the target data.

If enormous traffic flows are on the network, configure NetStream sampling.

Determine which export format is used for the NetStream data export.

Configure NetStream flow aging as needed.

To reduce the bandwidth consumption of the NetStream data export, configure NetStream
aggregation.

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