.. index:: pair: group; Prove that VLAN ID alternation is done correctly
.. _doxid-group__xmit-alternate__vlan:

Prove that VLAN ID alternation is done correctly
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.. toctree::
	:hidden:

Make sure that VLAN ID alternation performed by means of sending couples of mbufs with different VLAN IDs is carried out properly

The test is to verify that PMD is able to fulfill VLAN offload properly under such circumstances like sending couples of packets with different values of 'vlan_tci' field (or without such) in the corresponding mbufs

#. Initialize ethdev and obtain the device information

#. Check if VLAN insertion offload is supported and enable it

#. Configure and start ethdev

#. Obtain the source Ethernet address

#. Adjust the traffic template

#. Adjust so-called 'send transformations' for the 1st packet

#. Generate mbuf(s) and the corresponding pattern for the 1st packet

#. Adjust so-called 'send transformations' for the 2nd packet

#. Generate mbuf(s) and the corresponding pattern for the 2nd packet

#. Construct a burst array from the two packets

#. Concatenate the 1st and 2nd patterns

#. Create an RX CSAP on the TST host according to the template

#. Start to capture traffic with the pattern prepared

#. Ensure that interface is UP on Tester side

#. Validate and send the burst

#. Receive packets on peer

#. Verify the number of matching packets received



.. rubric:: Parameters:

.. list-table::
	:widths: 20 80

	*
		- template

		- Traffic template

	*
		- payload_len

		- Payload length, bytes

	*
		- vlan_id_first

		- VLAN ID (1st packet) or ``-1`` (disable)

	*
		- vlan_id_second

		- VLAN ID (2nd packet) or ``-1`` (disable)