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Create a RETH Interface

 

For an SD-WAN site with dual CPE cluster, you can use a redundant Ethernet (reth) interface to connect the SRX Series Customer Premise Equipment (CPE) devices to an EX Series switch or an access point (AP). A redundant Ethernet (reth) interface is a pseudo-interface that includes a physical interface from each node of a cluster. The reth interface of the active node is responsible for passing the traffic in a chassis cluster setup.

To create a reth interface:

  1. Click Resources > Devices.

    The Devices page is displayed.

  2. Select a CPE device from the list of devices displayed and click More > Manage Switch Connectivity.

    The Manage Switch Connectivity page is displayed. To access this page, the Management Status of the selected device should be Provisioned.

    Alternatively, click device-name from the Device Name column to open the Device Details page and then click CONFIGURATION (tab) > Interfaces (tab).

    You can also access the Device Details page from the Site Management page (Resources > Site Management site-name > DEVICES (tab) >device-name).

  3. Click Add RETH Interface.

    The Create RETH Interface page is displayed.

  4. Complete the configuration settings according to the guidelines provided in Table 1.
  5. Click OK.

    The RETH interface is listed on the Interfaces section of the page.

Table 1: Fields on the Add RETH Interface Page

Field

Description

RETH Interface

Select a reth interface from the list.

CPE Node 0 Port(s)

Select the physical interfaces (of the Node 0) to be assigned to the reth interface. These interfaces are used for data or management traffic between the switch and the CPE.

CPE Node 1 Port(s)

Select the physical interfaces (of the Node 1) to be assigned to the reth interface. These interfaces are used for data or management traffic between the switch and the CPE.

Redundancy Group

Select a redundancy group you want to associate this reth interface with. Alternatively, click Create Redundancy Group to create a redundancy group.

LACP

Enable Link Aggregation Control Protocol (LACP), a monitoring protocol that detects link-layer failure within a network, if you want to monitor the local and remote ends of member links (physical interfaces) in a reth interface.

Setting

If you have enabled LACP on the interface, select the LACP mode:

  • Active—To initiate transmission of LACP packets and response to LACP packets, you must configure LACP in active mode. If either the actor (transmitting link) or partner (receiving link) is active, they exchange LACP packets.

  • Passive—There is no exchange of LACP packets. This is the default transmission mode.

Interval

If you have enabled LACP on the interface, select an interval for periodic transmission of LACP packets from the following options:

  • fast—Transmits packets every second.

  • slow—Transmits packets every 30 seconds.

Force up

If you have enabled LACP on the interface, click the toggle button to enable the Force Up state on the interface. Enabling this feature sets the state of the interface as UP even when the peer has limited LACP capability.

LLDP

Use the toggle button to enable Link Layer Discovery Protocol (LLDP) on the interface. LLDP allows networked devices to advertise capabilities, identity, and other information onto a LAN. LLDP-capable devices transmit information in type, length, and value (TLV) messages to neighbor devices.