· NetStream collector—A program running in an operation system. The NSC parses the packets received from the NDEs, and saves the data to its database.

· NetStream data analyzer—A network traffic analyzing tool. Based on the data in NSC, the NDA generates reports for traffic billing, network planning, and attack detection and monitoring. The NDA can collect data from multiple NSCs. Typically, the NDA features a Web-based system for easy operation.

NSC and NDA are typically integrated into a NetStream server.

H3C network devices act as NDEs in the NetStream system. This document focuses on NDE configuration.

Figure 1 NetStream system

Flow aging

NetStream uses flow aging to enable the NDE to export NetStream data to NetStream servers. NetStream creates a NetStream entry for each flow for storing the flow statistics in the cache.

When the timer of the entry expires, the NDE performs the following operations:

· Exports the summarized data to NetStream servers in a NetStream export format.

· Clears NetStream entry information in the cache.

For more information about flow aging types and configurations, see "Configuring NetStream flow aging."

NetStream data export

NetStream traditional data export

Traditional NetStream collects the statistics of each flow and exports the statistics to NetStream servers.

The data includes the statistics of each flow. However, this method consumes more bandwidth and CPU than the aggregation method, and it requires a large cache size.

NetStream aggregation data export

NetStream aggregation merges the flow statistics according to the aggregation criteria of an aggregation mode, and it sends the summarized data to NetStream servers. The NetStream aggregation data export uses less bandwidth than the traditional data export.

Table 1 lists the available aggregation modes. In each mode, the system merges statistics for multiple flows into statistics for one aggregate flow if each aggregation criterion is of the same value. The system records the statistics for the aggregate flow. These aggregation modes work independently and can take effect concurrently.

For example, when the aggregation mode configured on the NDE is protocol-port, NetStream aggregates the statistics of flow entries by protocol number, source port, and destination port. Four NetStream entries record four TCP flows with the same destination address, source port, and destination port, but with different source addresses. In the aggregation mode, only one NetStream aggregation entry is created and sent to NetStream servers.

Table 1 NetStream aggregation modes

Aggregation mode	Aggregation criteria
Protocol-port aggregation	· Protocol number · Source port · Destination port
Source-prefix aggregation	· Source AS number · Source address mask length · Source prefix (source network address) · Inbound interface index
Destination-prefix aggregation	· Destination AS number · Destination address mask length · Destination prefix (destination network address) · Outbound interface index
Prefix aggregation	· Source AS number · Destination AS number · Source address mask length · Destination address mask length · Source prefix · Destination prefix · Inbound interface index · Outbound interface index
Prefix-port aggregation	· Source prefix · Destination prefix · Source address mask length · Destination address mask length · ToS · Protocol number · Source port · Destination port · Inbound interface index · Outbound interface index
ToS-source-prefix aggregation	· ToS · Source AS number · Source prefix · Source address mask length · Inbound interface index
ToS-destination-prefix aggregation	· ToS · Destination AS number · Destination address mask length · Destination prefix · Outbound interface index
ToS-prefix aggregation	· ToS · Source AS number · Source prefix · Source address mask length · Destination AS number · Destination address mask length · Destination prefix · Inbound interface index · Outbound interface index
ToS-protocol-port aggregation	· ToS · Protocol type · Source port · Destination port · Inbound interface index · Outbound interface index

If packets are not forwarded according to the BGP routing table, the AS number or 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.

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

· Version 9—Based on templates that can be defined according to the template formats defined in RFCs. The template feature supports exporting the NetStream aggregation data and statistics about BGP next hop.

NetStream filtering

NetStream filtering uses an ACL to identify packets. Whether NetStream collects data for identified packets depends on the action in the matching rule:

· NetStream collects data for packets that match permit rules in the ACL.

· NetStream does not collect data for packets that match deny rules in the ACL.

For more information about ACL, see ACL and QoS Configuration Guide.

Feature and hardware compatibility

The NetStream feature is available on the following interface modules:

· SD and EB.

· LSQ3GV48SC0.

· LSQ1TGS8SC0.

· .

NetStream configuration task list

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

· Choose the device on which you want to enable NetStream.

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

· Determine the export format for the NetStream data export.

· Configure NetStream flow aging.

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

Figure 2 NetStream configuration flow

To configure NetStream, perform the following tasks:

Tasks at a glance
(Required.) Enabling NetStream
(Optional.) Configuring NetStream filtering
(Optional.) Configuring attributes of the NetStream data export
(Optional.) Configuring NetStream flow aging
(Required.) Perform at least one of the following tasks to configure NetStream data export: · Configuring the NetStream traditional data export · Configuring the NetStream aggregation data export

Enabling NetStream

Step	Command	Remarks
1. Enter system view.	system-view	N/A
1. Enter interface view.	interface interface-type interface-number	N/A
2. Enable NetStream on the interface.	ip netstream { inbound \| outbound }	By default, NetStream is disabled on an interface.

Configuring NetStream filtering

Step	Command	Remarks
1. Enter system view.	system-view	N/A
2. Enter interface view.	interface interface-type interface-number	N/A
3. Configure NetStream filtering on the interface.	ip netstream { inbound \| outbound } filter acl acl-number	By default, NetStream filtering is disabled. NetStream collects statistics of all IPv4 packets passing through the interface.

Configuring attributes of the NetStream data export

Configuring the NetStream data export format

NetStream exports NetStream data in version 5 or version 9 format, and the data fields can be expanded to contain additional information, including the following:

· Statistics about source AS, destination AS, and peer ASs in version 5 or version 9 format.

· Statistics about BGP next hop only in version 9 format.

To configure the NetStream data export format:

Step	Command	Remarks
1. Enter system view.	system-view	N/A
2. (Optional.) Configure the NetStream data export format, and specify whether to record AS and BGP next hop information.	· ip netstream export version 5 [ origin-as \| peer-as ] · ip netstream export version 9 [ origin-as \| peer-as ] [ bgp-nexthop ]	By default: · The NetStream traditional data export uses the version 9 format. · The peer AS numbers are exported for the source and destination. · The BGP next hop is not exported.

Step

Command

Remarks

1. Enter system view.

system-view

N/A

2. (Optional.) Configure the NetStream data export format, and specify whether to record AS and BGP next hop information.

· ip netstream export version 5 [ origin-as | peer-as ]

· ip netstream export version 9 [ origin-as | peer-as ] [ bgp-nexthop ]

By default:

· The NetStream traditional data export uses the version 9 format.

· The peer AS numbers are exported for the source and destination.

· The BGP next hop is not exported.

A NetStream entry for a flow records the source IP address and destination IP address, and two AS numbers for each IP address. You can choose to configure the AS numbers to be exported as the source AS and destination AS:

· origin-as—Exports statistics of the source AS originating the route for the source address and the destination AS for the destination address.

· peer-as—Exports statistics of the peer ASs for the source and destination address.

For example, as shown in Figure 3, a flow starts at AS 20, passes AS 21 through AS 23, and then reaches AS 24. NetStream is enabled on the device in AS 22.

· If the origin-as keyword is specified, this command exports statistics of AS 20 (the source AS) and AS 24 (the destination AS).

· If the peer-as keyword is specified, this command exports statistics of AS 21 (the source AS) and AS 23 (the destination AS).

Figure 3 Recorded AS information varies by different keyword configurations

Configuring the refresh rate for NetStream version 9 templates

Version 9 is template-based and supports user-defined formats. An NetStream device must send the version 9 templates to NetStream servers regularly, because the servers do not permanently save templates.

For a NetStream server to use correct version 9 templates, configure the refresh frequency or refresh interval for version 9 templates. If both settings are configured, templates are sent when either of the conditions is reached.

To configure the refresh rate for NetStream version 9 templates:

Step	Command	Remarks
1. Enter system view.	system-view	N/A
2. (Optional.) Configure the refresh frequency for NetStream version 9 templates.	ip netstream export v9-template refresh-rate packet packets	By default, the version 9 templates are sent every 20 packets.
3. (Optional.) Configure the refresh interval for NetStream version 9 templates.	ip netstream export v9-template refresh-rate time minutes	By default, the version 9 templates are sent every 30 minutes.

Configuring NetStream flow aging

Flow aging methods

Periodical aging

Periodical aging uses the following methods:

· Inactive flow aging—A flow is inactive if no packet arrives for this NetStream entry within the period specified by using the ip netstream timeout inactive command. When the inactive flow aging timer expires, the following events occur:

¡ The inactive flow entry is aged out.

¡ The statistics of the flow are sent to NetStream servers. The statistics can no longer be displayed by using the display ip netstream cache command.

When you use the inactive flow aging method, the cache is large enough for new flow entries.

· Active flow aging—A flow is active if packets arrive for the NetStream entry within the period specified by using the ip netstream timeout active command. When the active flow aging timer expires, the statistics of the active flow are exported to NetStream servers. The device continues to collect active flow statistics, which can be displayed by using the display ip netstream cache command. The active flow aging method periodically exports the statistics of active flows to NetStream servers.

Forced aging

Use the reset ip netstream statistics command. This command ages out all NetStream entries, and exports and clears the statistics.

TCP FIN- and RST-triggered aging

TCP FIN- and RST-triggered aging is automatically performed when a TCP connection is terminated.

A TCP connection is terminated when a packet with a FIN or RST flag is received.

When a packet with a FIN or RST flag is recorded for a flow with an existing NetStream entry, the entry is immediately aged out, exported, and cleared. However, when the first packet of a flow has a FIN or RST flag, a new NetStream entry is created instead of being aged out.

TCP FIN- and RST-triggered aging is always enabled, and it cannot be disabled.

Configuration procedure

To configure flow aging:

Step	Command	Remarks
1. Enter system view.	system-view	N/A
2. (Optional.) Configure periodical aging.	· Set the aging timer for active flows: ip netstream timeout active minutes · Set the aging timer for inactive flows: ip netstream timeout inactive seconds	By default: · The aging timer for active flows is 5 minutes. · The aging timer for inactive flows is 300 seconds.
3. (Optional.) Configure forced aging.	a. Exit to user view: quit b. Age out NetStream entries: reset ip netstream statistics	N/A

Configuring the NetStream data export

Configuring the NetStream traditional data export

Step	Command	Remarks
1. Enter system view.	system-view	N/A
2. Specify a destination host for NetStream traditional data export.	ip netstream export host ip-address udp-port [ vpn-instance vpn-instance-name ]	By default, no destination host is specified. No NetStream traditional data is exported.
3. (Optional.) Specify the source interface for NetStream data packets sent to NetStream servers.	ip netstream export source interface interface-type interface-number	By default, no source interface is specified for NetStream data packets. The packets take the primary IP address of the output interface as the source IP address.
4. (Optional.) Limit the data export rate.	ip netstream export rate rate	By default, the data export rate is not limited.

Configuring the NetStream aggregation data export

NetStream aggregation can be implemented by software or hardware. Unless otherwise noted, NetStream aggregation refers to software NetStream aggregation.

NetStream hardware aggregation uses hardware to directly merge the flow statistics according to the aggregation mode criteria, and stores the data in the cache. The aging of NetStream hardware aggregation entries is the same as the aging of NetStream traditional data entries. When a hardware aggregation entry is aged out, the data is exported.

NetStream hardware aggregation reduces the resource consumption by NetStream aggregation.

Configuration restrictions and guidelines

When you configure the NetStream aggregation data export, follow these guidelines:

· The NetStream hardware aggregation does not take effect in the following situations:

¡ The destination host is configured for the NetStream traditional data export in system view.

¡ The configured aggregation mode is not supported by NetStream hardware aggregation.

· Configurations in NetStream aggregation mode view apply only to the NetStream aggregation data export, and those in system view apply to the NetStream traditional data export. If configurations in NetStream aggregation mode view are not provided, the configurations in system view apply to the NetStream aggregation data export.

· If the version 5 format is configured to export NetStream data, NetStream aggregation data export uses the version 8 format.

Configuration procedure

To configure the NetStream aggregation data export:

Step	Command	Remarks
1. Enter system view.	system-view	N/A
2. (Optional.) Enable the NetStream hardware aggregation.	ip netstream aggregation advanced	By default, the NetStream hardware aggregation is disabled.
3. Enter NetStream aggregation mode view.	ip netstream aggregation { destination-prefix \| prefix \| prefix-port \| protocol-port \| source-prefix \| tos-destination-prefix \| tos-prefix \| tos-protocol-port \| tos-source-prefix }	N/A
4. Specify a destination host for NetStream aggregation data export.	ip netstream export host ip-address udp-port [ vpn-instance vpn-instance-name ]	By default, no destination host is specified. If you expect only NetStream aggregation data, specify the destination host only in the related NetStream aggregation mode view.
5. (Optional.) Specify the source interface for NetStream data packets sent to NetStream servers.	ip netstream export source interface interface-type interface-number	By default, no source interface is specified for NetStream data packets. The packets take the primary IP address of the output interface as the source IP address. Source interfaces in different NetStream aggregation mode views can be different. If no source interface is configured in NetStream aggregation mode view, the source interface configured in system view applies.
6. Enable the NetStream aggregation mode.	enable	By default, NetStream aggregation is disabled.

Displaying and maintaining NetStream

Execute display commands in any view and reset commands in user view.

Task	Command
Display NetStream entry information (in standalone mode).	display ip netstream cache [ slot slot-number ] [ verbose ]
Display NetStream entry information (in IRF mode).	display ip netstream cache [ chassis chassis-number slot slot-number ] [ verbose ]
Display information about the NetStream data export.	display ip netstream export
Display NetStream template information (in standalone mode).	display ip netstream template [ slot slot-number ]
Display NetStream template information (in IRF mode).	display ip netstream template [ chassis chassis-number slot slot-number ]
Age out and export all NetStream data, and clear the cache.	reset ip netstream statistics

NetStream configuration examples

NetStream traditional data export configuration example

Network requirements

As shown in Figure 4, configure NetStream on Switch A to collect statistics on packets passing through Switch A.

· Enable NetStream for incoming traffic on Gigabitethernet 1/0/1 and outgoing traffic on GigabitEthernet 1/0/2.

· Configure the switch to export NetStream traditional data to UDP port 5000 of the NetStream server.

Figure 4 Network diagram

Configuration procedure

# Assign an IP address to each interface, as shown in Figure 4. (Details not shown.)

# Configure GigabitEthernet 1/0/1 to operate in Layer 3 mode.

<SwitchA> system-view

[SwitchA] interface gigabitethernet 1/0/1

[SwitchA-GigabitEthernet1/0/1] port link-mode route

# Enable NetStream for incoming traffic on GigabitEthernet 1/0/1.

[SwitchA-GigabitEthernet1/0/1] ip netstream inbound

[SwitchA-GigabitEthernet1/0/1] quit

# Configure GigabitEthernet 1/0/2 to operate in Layer 3 mode.

[SwitchA] interface gigabitethernet 1/0/2

[SwitchA-GigabitEthernet1/0/2] port link-mode route

# Enable NetStream for outgoing traffic on GigabitEthernet 1/0/2.

[SwitchA-GigabitEthernet1/0/2] ip netstream outbound

[SwitchA-GigabitEthernet1/0/2] quit

# Specify 12.110.2.2 as the IP address of the destination host and UDP port 5000 as the export destination port number.

[SwitchA] ip netstream export host 12.110.2.2 5000

Verifying the configuration

# Display NetStream entry information.

[SwitchA] display ip netstream cache

IP NetStream cache information:

Active flow timeout : 5 min

Inactive flow timeout : 300 sec

Max number of entries : 16384

IP active flow entries : 2

MPLS active flow entries : 0

L2 active flow entries : 0

IPL2 active flow entries : 0

IP flow entries counted : 0

MPLS flow entries counted : 0

L2 flow entries counted : 0

IPL2 flow entries counted : 0

Last statistics resetting time : Never

IP packet size distribution (11 packets in total):

1-32 64 96 128 160 192 224 256 288 320 352 384 416 448 480

.000 .000 .909 .000 .000 .090 .000 .000 .000 .000 .000 .000 .000 .000 .000

512 544 576 1024 1536 2048 2560 3072 3584 4096 4608 >4608

.000 .000 .000 .000 .000 .000 .000 .000 .000 .000 .000 .000

Protocol Total Packets Flows Packets Active(sec) Idle(sec)

Flows /sec /sec /flow /flow /flow

---------------------------------------------------------------------------

Type DstIP(Port) SrcIP(Port) Pro ToS If(Direct) Pkts

DstMAC(VLAN) SrcMAC(VLAN)

TopLblType(IP/MASK) Lbl-Exp-S-List

---------------------------------------------------------------------------

IP 12.110.2.2 (0) 11.111.2.2 (0) 1 0 GE1/0/1(I) 5

IP 12.110.2.2 (0) 11.111.2.2 (0) 1 0 GE1/0/2(O) 5

# Display information about the NetStream data export.

[SwitchA] display ip netstream export

IP export information:

Flow source interface : Not specified

Flow destination VPN instance : Not specified

Flow destination IP address (UDP) : 12.110.2.2 (5000)

Version 5 exported flows number : 0

Version 5 exported UDP datagrams number (failed): 0 (0)

Version 9 exported flows number : 10

Version 9 exported UDP datagrams number (failed): 10 (0)

L2 export information:

Flow source interface : Not specified

Flow destination VPN instance : Not specified

Flow destination IP address (UDP) : 12.110.2.2 (5000)

Version 9 exported flow number : 0

Version 9 exported UDP datagram number (failed) : 0 (0)

NetStream aggregation data export configuration example

Network requirements

As shown in Figure 5, all devices in the network are running EBGP. Configure NetStream on Switch A to meet the following requirements:

· Use version 5 format to export NetStream traditional data to port 5000 of the NetStream server at 4.1.1.1/16.

· Perform NetStream aggregation in the modes of protocol-port, source-prefix, destination-prefix, and prefix.

· Export the aggregation data of different modes to 4.1.1.1, with UDP ports 3000, 4000, 6000, and 7000.

Figure 5 Network diagram

Configuration procedure

# Assign an IP address to each interface, as shown in Figure 5. (Details not shown.)

# Configure GigabitEthernet 1/0/1 to operate in Layer 3 mode.

<SwitchA> system-view

[SwitchA] interface gigabitethernet 1/0/1

[SwitchA-GigabitEthernet1/0/1] port link-mode route

# Enable NetStream for incoming and outgoing traffic on GigabitEthernet 1/0/1.

[SwitchA-GigabitEthernet1/0/1] ip netstream inbound

[SwitchA-GigabitEthernet1/0/1] ip netstream outbound

[SwitchA-GigabitEthernet1/0/1] quit

# Specify version 5 format to export NetStream traditional data.

<SwitchA> ip netstream export version 5

# Specify 4.1.1.1 as the IP address of the destination host and UDP port 5000 as the export destination port number.

[SwitchA] ip netstream export host 4.1.1.1 5000

# Set the aggregation mode to protocol-port, and specify the destination host for the aggregation data export.

[SwitchA] ip netstream aggregation protocol-port

[SwitchA-ns-aggregation-protport] enable

[SwitchA-ns-aggregation-protport] ip netstream export host 4.1.1.1 3000

[SwitchA-ns-aggregation-protport] quit

# Set the aggregation mode to source-prefix, and specify the destination host for the aggregation data export.

[SwitchA] ip netstream aggregation source-prefix

[SwitchA-ns-aggregation-srcpre] enable

[SwitchA-ns-aggregation-srcpre] ip netstream export host 4.1.1.1 4000

[SwitchA-ns-aggregation-srcpre] quit

# Set the aggregation mode to destination-prefix, and specify the destination host for the aggregation data export.

[SwitchA] ip netstream aggregation destination-prefix

[SwitchA-ns-aggregation-dstpre] enable

[SwitchA-ns-aggregation-dstpre] ip netstream export host 4.1.1.1 6000

[SwitchA-ns-aggregation-dstpre] quit

# Set the aggregation mode to prefix, and specify the destination host for the aggregation data export.

[SwitchA] ip netstream aggregation prefix

[SwitchA-ns-aggregation-prefix] enable

[SwitchA-ns-aggregation-prefix] ip netstream export host 4.1.1.1 7000

[SwitchA-ns-aggregation-prefix] quit

Verifying the configuration

# Display NetStream entry information.

[SwitchA] display ip netstream cache

IP NetStream cache information:

Active flow timeout : 5 min

Inactive flow timeout : 300 sec

Max number of entries : 16384

IP active flow entries : 2

MPLS active flow entries : 0

L2 active flow entries : 0

IPL2 active flow entries : 0

IP flow entries counted : 0

MPLS flow entries counted : 0

L2 flow entries counted : 0

IPL2 flow entries counted : 0

Last statistics resetting time : Never

IP packet size distribution (11 packets in total):

1-32 64 96 128 160 192 224 256 288 320 352 384 416 448 480

.000 .000 .909 .000 .000 .090 .000 .000 .000 .000 .000 .000 .000 .000 .000

512 544 576 1024 1536 2048 2560 3072 3584 4096 4608 >4608

.000 .000 .000 .000 .000 .000 .000 .000 .000 .000 .000 .000

Protocol Total Packets Flows Packets Active(sec) Idle(sec)

Flows /sec /sec /flow /flow /flow

---------------------------------------------------------------------------

Type DstIP(Port) SrcIP(Port) Pro ToS If(Direct) Pkts

DstMAC(VLAN) SrcMAC(VLAN)

TopLblType(IP/MASK) Lbl-Exp-S-List

---------------------------------------------------------------------------

IP 3.1.1.1(0) 3.1.1.2 (0) 1 0 GE1/0/1(I) 5

IP 3.1.1.2 (0) 3.1.1.1 (0) 1 0 GE1/0/1(O) 5

# Display information about the NetStream data export.

[SwitchA] display ip netstream export

protocol-port aggregation export information:

Flow source interface : Not specified

Flow destination VPN instance : Not specified

Flow destination IP address (UDP) : 4.1.1.1 (3000)

Version 8 exported flows number : 2

Version 8 exported UDP datagrams number (failed): 2 (0)

Version 9 exported flows number : 0

Version 9 exported UDP datagrams number (failed): 0 (0)

source-prefix aggregation export information:

Flow source interface : Not specified

Flow destination VPN instance : Not specified

Flow destination IP address (UDP) : 4.1.1.1 (4000)

Version 8 exported flows number : 2

Version 8 exported UDP datagrams number (failed): 2 (0)

Version 9 exported flows number : 0

Version 9 exported UDP datagrams number (failed): 0 (0)

destination-prefix aggregation export information:

Flow source interface : Not specified

Flow destination VPN instance : Not specified

Flow destination IP address (UDP) : 4.1.1.1 (6000)

Version 8 exported flows number : 2

Version 8 exported UDP datagrams number (failed): 2 (0)

Version 9 exported flows number : 0

Version 9 exported UDP datagrams number (failed): 0 (0)

prefix aggregation export information:

Flow source interface : Not specified

Flow destination VPN instance : Not specified

Flow destination IP address (UDP) : 4.1.1.1 (7000)

Version 8 exported flows number : 2

Version 8 exported UDP datagrams number (failed): 2 (0)

Version 9 exported flows number : 0

Version 9 exported UDP datagrams number (failed): 0 (0)

IP export information:

Flow source interface : Not specified

Flow destination VPN instance : Not specified

Flow destination IP address (UDP) : 4.1.1.1 (5000)

Version 5 exported flows number : 10

Version 5 exported UDP datagrams number (failed): 10 (0)

Version 9 exported flows number : 0

Version 9 exported UDP datagrams number (failed): 0 (0)

L2 export information:

Flow source interface : Not specified

Flow destination VPN instance : Not specified

Flow destination IP address (UDP) : 4.1.1.1 (5000)

Version 9 exported flow number : 0

Version 9 exported UDP datagram number (failed) : 0 (0)

12-Network Management and Monitoring Configuration Guide

NetStream traditional data export

NetStream aggregation data export

NetStream export formats

NetStream filtering

NetStream configuration task list

Configuring NetStream filtering

Configuring NetStream flow aging

Flow aging methods

Configuring the NetStream aggregation data export

Configuration restrictions and guidelines

Configuration procedure

Displaying and maintaining NetStream

NetStream configuration examples

Network requirements

Configuration procedure

Verifying the configuration

Network requirements

Configuration procedure

Verifying the configuration

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