Tap Mode

In Tap mode, a pair of adjacent ports on the device, called tap partners, are connected to form a Tap that allows the module to monitor traffic. In Tap mode, physical Port 1 and Port 2 are Tap partners, and Port 3 and Port 4 are Tap partners. A frame received on one Tap partner is transmitted out of the other Tap partner, which mimics the behavior of an Ethernet cable.
Note For more information about Tap latency, refer to the PXIe-8623 Specifications.
When an input session is created using an XNET interface for either Tap partner, and the "/monitor" suffix is used with the XNET interface, the session reads frames going through the Tap partners. Output sessions are not supported in Tap mode.
Note You only need to select the monitor of one port in the Tap pairing. If both monitors are selected, you will receive the same data twice.

Setting one port to Tap mode will automatically set the port's Tap partner to Tap mode. The module supports two Taps (Ports 1/2 and Ports 3/4) using this mode. All four ports can also be used simultaneously while one pair is in Tap mode and the other ports are in Direct mode. The following diagram describes one Tap pair on the module.

Figure 4. Tap Mode

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