R3303-HP HSR6800 Routers Network Management and Monitoring Configuration Guide

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In an aggregation mode with AS, if the packets are not forwarded according to the BGP routing table,
the statistics on 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 statistics on 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. The packet format is
fixed and cannot be extended flexibly.
• Version 8—Supports NetStream aggregation data export. The packet formats are fixed and cannot
be extended flexibly.
• Version 9—The most flexible format. Users can define templates that have different statistics fields.
The template feature supports different statistics, such as BGP next hop and MPLS information.
NetStream sampling and filtering
NetStream sampling
NetStream sampling basically reflects the network traffic information by collecting statistics on fewer
packets. The reduced statistics to be transferred also reduces the impact on the device performance. For
more information about sampling, see "Configuring sampler."
NetStream filtering
NetStream filtering is implemented by referencing an ACL to NetStream. NetStream filtering enables a
NetStream module to collect statistics on packets that match the criteria. The filtering allows for selecting
specific data flows for statistics purposes.
NetStream configuration task list
Before you configure NetStream, verify that the following configurations are proper, 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.
• Decide which export format is used for NetStream data export.
• Configure the timer for NetStream flow aging.
• To reduce the bandwidth consumption of NetStream data export, configure NetStream
aggregation.