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Example: Configuring LACP on Chassis Clusters


This example shows how to configure LACP on chassis clusters.


Before you begin:

Complete the tasks such as enabling the chassis cluster, configuring interfaces and redundancy groups. See SRX Series Chassis Cluster Configuration Overview and Example: Configuring Chassis Cluster Redundant Ethernet Interfaces for more details.


You can combine multiple physical Ethernet ports to form a logical point-to-point link, known as a link aggregation group (LAG) or bundle. You configure LACP on a redundant Ethernet interface of SRX series device in chassis cluster.

In this example, you set the LACP mode for the reth1 interface to active and set the link aggregation control PDU transmit interval to slow, which is every 30 seconds.

When you enable LACP, the local and remote sides of the aggregated Ethernet links exchange protocol data units (PDUs), which contain information about the state of the link. You can configure Ethernet links to actively transmit PDUs, or you can configure the links to passively transmit them (sending out LACP PDUs only when they receive them from another link). One side of the link must be configured as active for the link to be up.

Figure 1 shows the topology used in this example.

Figure 1: Topology for LAGs Connecting SRX Series Devices in Chassis Cluster to an EX Series Switch
for LAGs Connecting SRX Series Devices in Chassis Cluster to an EX
Series Switch

In the Figure 1, the ge-3/0/0 interface on SRX Series device is connected to ge-0/0/0 interface on EX Series switch and the ge-15/0/0 interface is connected to ge-0/0/1 on EX Series switch. For more information on EX Series switch configuration, see Configuring Aggregated Ethernet LACP (CLI Procedure).


Step-by-Step Procedure

The following example requires you to navigate various levels in the configuration hierarchy. For instructions on how to do that, see the CLI User Guide.

To configure LACP on chassis clusters:

  1. Bind redundant child physical interfaces to reth1.
  2. Add reth1 to redundancy group 1.
  3. Set the LACP on reth1.
  4. Assign an IP address to reth1.
  5. If you are done configuring the device, commit the configuration.


Verifying LACP on Redundant Ethernet Interfaces


Display LACP status information for redundant Ethernet interfaces.


From operational mode, enter the show lacp interfaces reth1 command.

user@host> show lacp interfaces reth1

The output shows redundant Ethernet interface information, such as the following:

  • The LACP state—Indicates whether the link in the bundle is an actor (local or near-end of the link) or a partner (remote or far-end of the link).

  • The LACP mode—Indicates whether both ends of the aggregated Ethernet interface are enabled (active or passive)—at least one end of the bundle must be active.

  • The periodic link aggregation control PDU transmit rate.

  • The LACP protocol state—Indicates the link is up if it is collecting and distributing packets.