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Verifying Proxy ARP and ARP Suppression for the Edge-Routed Bridging Overlay

Verifying Proxy ARP and ARP Suppression for the Edge-Routed Bridging Overlay

Proxy ARP and ARP suppression are enabled by default on all QFX Series switches that can act as leaf devices in an edge-routed bridging overlay. (For a list of these switches, see Data Center Fabric Reference Design Supported Hardware Summary.) As a result, there is no configuration needed to enable these features.

Note:

By default, the Junos OS enables proxy ARP and ARP suppression, and proxy NDP and NDP suppression. The Junos OS includes the no-arp-suppression statement to turn off suppressing ARP and NDP packets, but starting in Junos OS Release 19.1R1, that statement is hidden in the Junos CLI. We usually recommend using the default settings.

To verify proxy ARP is working on supported devices and ARP suppression prevents other leaf devices from seeing the ARP requests, perform the following:

  1. Select a remote end system entry to verify that proxy ARP is enabled on a supported leaf device. In this example, Leaf 10 is a QFX10002 switch.
  2. Verify that the entry was learned from a remote leaf device. In this case, the ARP entry was learned from Leaf 4 and 5.
  3. Send an ARP Request and verify that the ARP reply is generated.
  4. Verify that ARP is suppressed in the remote leaf device. Note: There is no ARP request connecting Leaf 4 to any other leaf in the segment.

Proxy ARP and ARP Suppression for an Edge-Routed Bridging Overlay — Release History

Table 1 provides a history of all of the features in this section and their support within this reference design.

Table 1: Proxy ARP and ARP Suppression in an Edge-Routed Bridging Overlay Release History

Release

Description

19.1R2

QFX10002-60C and QFX5120-32C switches running Junos OS Release 19.1R2 and later releases in the same release train also support all features documented in this section.

19.1R1

The no-arp-suppression statement is hidden in the CLI starting in Junos OS Release 19.1R1, but you can configure it in some use cases where we require you to turn off ARP suppression.

18.4R2

QFX5120-48Y switches running Junos OS Release 18.4R2 and later releases in the same release train support all features documented in this section.

18.1R3-S3

All devices in the reference design that support Junos OS Release 18.1R3-S3 and later releases in the same release train also support all features documented in this section.

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