Contents

Configuring flow groups· 1

About flow groups· 1

Restrictions and guidelines: Flow group configuration· 1

Procedure· 2

Verifying and maintaining flow group· 2

Configuring flow groups

About flow groups

A flow group allows you to identify flows based on flow entry 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

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The flow entries generated by a flow group can be used by other features. In the current software version, the MOD feature relies on these flow entries to work correctly.

A flow group can be in one of the following modes:

·     MOD mode—Used by MOD. This mode occupies hardware resources but has a lower burden on the CPU. For more information about MOD, see Telemetry Configuration Guide.

·     Elephant/mice flow mode—Used by the elephant and mice flows distinguishing feature (see ACL and QoS Configuration Guide).

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.

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 mice-elephant-flow ]

3.     Specify an ACL.

if-match acl { 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 } *

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

5.     Return to system view.

quit

6.     Set the aging time for flow entries.

telemetry flow-group aging-time aging-time

The default setting is 15 mintues.

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

telemetry flow-group max-entry max-entries

The number of flow entries is not limited.

8.     Apply the flow group.

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

By default, no flow group is applied.

Verifying and maintaining flow group

Perform all display tasks in in any view.

·     Display the configuration and application status of flow groups.

display telemetry flow-group [ group-id | name group-name ] [ slot slot-number ]

·     Display flow entries.

display telemetry flow-group flow-table [ [ group-id | name group-name ] | mod | mice-elephant-flow ] [ destination-ip { dst-ipv4 | dst-ipv6 } | destination-port dst-port | protocol protocol | source-ip { src-ipv4 | src-ipv6 } | source-port src-port ] * { slot slot-number }