BGP GR helper mode test plan

[DRAFT, UNDER DEVELOPMENT]

• Overview
  • Scope
  • Testbed
• Setup configuration
  • Arista VM configuration
  • Ansible scripts to setup and run test
    • everflow_testbed.yml
• PTF Test
  • Input files for PTF test
  • Traffic validation in PTF
• Test cases
• TODO
• Open Questions

Overview

The purpose is to test a functionality of BGP GR mode on the SONIC switch DUT, closely resembling production environment. The test assumes all necessary configuration is already pre-configured on the SONIC switch before test runs.

Scope

The test is targeting a running SONIC system with fully functioning configuration. The purpose of the test is not to test specific API, but functional testing of BGP GR helper mode on SONIC system, making sure that traffic flows correctly, according to BGP routes advertised by BGP peers of SONIC switch.

Testbed

The test will run on the following testbeds:

• tXX

Setup configuration

Arista VM configuration

Test assumes that BGP GR is enabled and preconfigured on Arista VMs. BGP GR timer value should be more than time required for VM reboot.

Ansible scripts to setup and run test

bgp_gr_helper.yml

bgp_gr_helper.yml when run with tag "bgp_gr_helper" will do the following:

1. Randomly choose VM.
2. Run test.

BGP GR helper test consists of a number of subtests, and each of them will include the following steps:

1. Run lognanalyzer 'init' phase
2. Run BGP GR helper Sub Test
3. Run loganalyzer 'analyze' phase

PTF Test

To run traffic FIB PTF test will be reused.

Test cases

Each test case will be additionally validated by the loganalizer utility.

Test case #1 - BGP GR helper mode.

Test objective

Verify that traffic run without changes during neighbor graceful restart.

Test steps

• Randomly choose VM for the test.
• Reboot VM.
• Run FIB test while VM is rebooting. Verify that traffic still goes through the interface connected to the neighbor (FIB test should pass).
• Verify that BGP session with the VM established.

Other possible tests

TODO

Open Questions

• Should tests run for neighbors behind physical interfaces only or behind LAGs as well?
• On which topologies test should run?