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[snappi] test_multidut_pfcwd_all_to_all is not working as expected as in test plan #17413

@sdszhang

Description

@sdszhang

Test case: test_multidut_pfcwd_a2a_with_snappi.py::test_multidut_pfcwd_all_to_all

Issue

Traffic flow is created with one egress port instead of two egress port.

According to test plan, the traffic should have two egress ports.
https://github.com/sonic-net/sonic-mgmt/blob/master/docs/testplan/pfcwd/PFCWD_2SENDER_2RECEIVER.md

However, in current test case, the Test traffic is created from port 1 and port 2 to port 0: only one egress port.

14/02/2025 04:23:42 pfcwd_multidut_multi_node_helper.__verif L0631 INFO   | Flow Name : Test Flow 1 -> 0 Prio 4 , Tx Frames : 10536398, Rx Frames : 6099132
14/02/2025 04:23:42 pfcwd_multidut_multi_node_helper.__verif L0662 INFO   | Once PFC watchdog is triggered, it will impact bi-directional traffic
14/02/2025 04:23:42 pfcwd_multidut_multi_node_helper.__verif L0663 INFO   | Tx and Rx should have dropped packets
14/02/2025 04:23:42 pfcwd_multidut_multi_node_helper.__verif L0631 INFO   | Flow Name : Test Flow 2 -> 0 Prio 4 , Tx Frames : 10536398, Rx Frames : 6128610
14/02/2025 04:23:42 pfcwd_multidut_multi_node_helper.__verif L0662 INFO   | Once PFC watchdog is triggered, it will impact bi-directional traffic
14/02/2025 04:23:42 pfcwd_multidut_multi_node_helper.__verif L0663 INFO   | Tx and Rx should have dropped packets

expected result

Traffic should be send to two egress port.

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