[nxapi] Add vrf option to nxos_nxapi module

[Miyoshi-Ryota]

SUMMARY

Add vrf option to nxos_nxapi module.

Comments on the design:

It's an old module with only state: present / absent. As far as I can see, when state: present is specified, it does not change parameters that are not mentioned. For example, if the nxapi sandbox command is already present on the device but the sandbox parameter is not specified in the playbook, it results that no deletion or other actions are taken.

Therefore, the vrf option follows this design.

Not applying the nxapi use-vrf command at all means enabling nxapi for all VRFs. However, in my implementation of this module, there is currently no way to remove an already applied nxapi use-vrf configuration at all. This is because while it is possible to specify another VRF, but there is no way to reflect the absence of a parameter. This aligns with the aforementioned behavior of state: present where nothing is done if a parameter is not specified.

This implementation method was chosen to maintain consistency within the module, avoid disrupting environments using the existing nxos_nxapi module, and keep the parameters simple.

Other possible approaches:

• Implementing a behavior similar to the state: overriden in other modules, meaning if no VRF is specified, the existing nxapi use-vrf setting would be deleted.
• Making the parameter more complex. For example, explicitly enabling or disabling as follows:

vrf:
  limit_to_vrf: bool
  vrf_name: xxx

If you prefer to select one of other two approaches I mentioned, or an entirely different approach, please let me know. I am willing to make adjustments accordingly.

Reference for the supported versions of use-vrf:

• For N9K:

  • At least, supported in version 7.0(3)I3(1)
    • https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus9000/sw/7-x/command_references/configuration_commands/b_Using_N9K_Config_Commands/b_N9K_Bookmap_chapter_01111.html#wp4568333650
  • Also, it is not supported in version 6.1(2)I2(2)
    • https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus9000/sw/6-x/command_reference/config_612I22/b_n9k_command_ref/b_n9k_command_ref_chapter_010000.html#wp2897910537
  • I am unsure of the exact version where it was released. I have reviewed all the release notes, but there is no mention of it.

• For N7K:

  • The nxapi use-vrf feature is introduced in Cisco NX-OS Release 8.2(3), which helps to secure NX-API by binding the NX-API to a particular VRF.

    • https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus7000/sw/programmability/guide/cisco_nexus7000_programmability_guide_8x/b-cisco-nexus7000-programmability-guide-8x_chapter_011.html

• For N3K:

  • At least, supported in version 7.0(3)I4(1)
    • https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus3000/sw/command/reference/703i74m3k/config/b_N3K_Config_Commands_703i74/b_N3K_Config_Commands_703i74_chapter_01111.html#wp1351653258

ISSUE TYPE

• Feature Pull Request

COMPONENT NAME

nxos_nxapi_module

ADDITIONAL INFORMATION

[Miyoshi-Ryota]

It's a WIP. I will test this change for real device.

[Miyoshi-Ryota]

All my work is completed and it is ready for review.

Since Version class bug also affects the functionality I want to add this time, I have made the corrections within the same PR. However, if it needs to be split into two separate PRs, please let me know.
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