Contents

Configuring flow groups· 1

About flow groups· 1

Restrictions and guidelines: Flow group configuration· 1

Procedure· 1

Display and maintenance commands for flow group· 2

Configuring flow groups

About flow groups

A flow group allows you to identify flows based on flow generation rules. The device extracts traffic characteristics (for example, 5-tuples in the packet header) and generates flow entries according to the header fields specified in a flow generation rule.

A flow group can use an ACL to limit the traffic for which flow entries are generated. A flow entry is aged out if no matching packets are received before the aging timer expires.

Figure 1 Flow entry generation

The flow entries generated by a flow group can be used by other features. A flow group can only be in simple MOD mode. This mode has a higher burden on the CPU but saves hardware resources.

Restrictions and guidelines: Flow group configuration

A flow group can reference only one ACL.

Because a flow can belong to only one flow group, make sure the same flow is not assigned to more than one flow group when specifying ACLs. For information about ACLs, see ACL and QoS Configuration Guide.

To delete an applied flow group, first remove the application and then delete the flow group.

Only one flow group can be applied.

Procedure

1.     Enter system view.

system-view

2.     Create a flow group and enter its view.

telemetry flow-group group-id [ name group-name ] [ mode simple-mod ]

3.     Specify an ACL.

if-match acl [ ipv6 ] { acl-number | name acl-name }

By default, no ACL is specified.

4.     Configure the header fields used for generating flow entries.

template { destination-ip | destination-port | protocol | source-ip | source-port | vxlan { inner-destination-ip | inner-destination-port | inner-protocol | inner-source-ip | inner-source-port | vxlan-id } * } *

By default, no header fields are used for generating flow entries.

5.     Return to system view.

quit

6.     (Optional.) Set the aging time for flow entries.

telemetry flow-group aging-time aging-time

The default setting is 15 minutes.

7.     (Optional.) Set the maximum rate of packets sent to the CPU to limit the flow entry generation rate.

telemetry flow-group rate-limit pps

The default setting is 256 pps.

8.     (Optional.) Set the maximum number of flow entries generated.

telemetry flow-group max-entry max-entries

The default setting is 5000.

9.     Apply the flow group.

telemetry apply flow-group { group-id | name group-name }

By default, no flow group is applied.

Display and maintenance commands for flow group

Execute display commands in any view.

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