diff --git a/tests/dualtor_io/conftest.py b/tests/dualtor_io/conftest.py
index 4504a3a7287..5077540912d 100644
--- a/tests/dualtor_io/conftest.py
+++ b/tests/dualtor_io/conftest.py
@@ -35,10 +35,17 @@ def pytest_generate_tests(metafunc):
 def setup_loganalyzer(loganalyzer):
     """Fixture to allow customize loganalyzer behaviors."""
 
-    def _setup_loganalyzer(duthost, collect_only):
+    KERNEL_BOOTUP_SYSLOG = "kernel: [    0.000000] Linux version"
+
+    def _setup_loganalyzer(duthost, collect_only=False, collect_from_bootup=False):
         if collect_only:
             loganalyzer[duthost.hostname].match_regex = []
             loganalyzer[duthost.hostname].expect_regex = []
             loganalyzer[duthost.hostname].ignore_regex = []
 
+        if collect_from_bootup:
+            loganalyzer[duthost.hostname].start_marker = KERNEL_BOOTUP_SYSLOG
+            loganalyzer[duthost.hostname].ansible_loganalyzer.start_marker = \
+                KERNEL_BOOTUP_SYSLOG
+
     return _setup_loganalyzer
diff --git a/tests/dualtor_io/test_tor_failure.py b/tests/dualtor_io/test_tor_failure.py
index 07adf8e5164..8f9e14850bf 100644
--- a/tests/dualtor_io/test_tor_failure.py
+++ b/tests/dualtor_io/test_tor_failure.py
@@ -66,7 +66,7 @@ def test_active_tor_reboot_upstream(
     Send upstream traffic and reboot the active ToR. Confirm switchover
     occurred and disruption lasts < 1 second
     """
-    setup_loganalyzer(upper_tor_host, collect_only=True)
+    setup_loganalyzer(upper_tor_host, collect_only=True, collect_from_bootup=True)
     send_server_to_t1_with_action(
         upper_tor_host, verify=True, delay=MUX_SIM_ALLOWED_DISRUPTION_SEC,
         action=toggle_upper_tor_pdu, stop_after=60
@@ -99,7 +99,7 @@ def test_active_tor_reboot_downstream_standby(
     Send downstream traffic to the standby ToR and reboot the active ToR.
     Confirm switchover occurred and disruption lasts < 1 second
     """
-    setup_loganalyzer(upper_tor_host, collect_only=True)
+    setup_loganalyzer(upper_tor_host, collect_only=True, collect_from_bootup=True)
     send_t1_to_server_with_action(
         lower_tor_host, verify=True, delay=MUX_SIM_ALLOWED_DISRUPTION_SEC,
         action=toggle_upper_tor_pdu, stop_after=60
@@ -123,7 +123,7 @@ def test_standby_tor_reboot_upstream(
     Send upstream traffic and reboot the standby ToR. Confirm no switchover
     occurred and no disruption
     """
-    setup_loganalyzer(lower_tor_host, collect_only=True)
+    setup_loganalyzer(lower_tor_host, collect_only=True, collect_from_bootup=True)
     send_server_to_t1_with_action(
         upper_tor_host, verify=True,
         action=toggle_lower_tor_pdu, stop_after=60
@@ -147,7 +147,7 @@ def test_standby_tor_reboot_downstream_active(
     Send downstream traffic to the active ToR and reboot the standby ToR.
     Confirm no switchover occurred and no disruption
     """
-    setup_loganalyzer(lower_tor_host, collect_only=True)
+    setup_loganalyzer(lower_tor_host, collect_only=True, collect_from_bootup=True)
     send_t1_to_server_with_action(
         upper_tor_host, verify=True,
         action=toggle_lower_tor_pdu, stop_after=60