Gcu port speed Change Test

tests/common/plugins/conditional_mark/tests_mark_conditions.yaml

@@ -2520,6 +2520,14 @@ generic_config_updater/add_cluster/test_add_cluster.py:
     conditions:
       - asic_type in ['vs']
 
+generic_config_updater/add_cluster/test_port_speed_change.py:
+  skip:
+    reason: "This test case right now only supported for Nokia Chassis"
+    conditions_logical_operator: "OR"
+    conditions:
+      - "hwsku not in ['Nokia-IXR7250E-36x400G']"
+      - "asic_type in ['vs']"
+
 generic_config_updater/test_bgp_prefix.py::test_bgp_prefix_tc1_suite:
   skip:
     reason: "Cisco 8122 backend compute ai platform is not supported. Skip on VS platform due to low success rate."

tests/generic_config_updater/add_cluster/platform_constants.py

@@ -0,0 +1,44 @@
+"""
+This module defines mappings and relationships between various
+platforms and their supported network speeds, and configuration parameters.
+
+Attributes:
+    PLATFORM_SUPPORTED_SPEEDS_MAP (dict):
+        A mapping of platform identifiers to the list of supported
+        network speeds (in Mbps). Each key is a platform identifier
+        (e.g., 'x86_64-nokia_ixr7250e_36x400g-r0'), and the value is
+        a list of supported speed values as strings.
+
+    PLATFORM_SPEED_LANES_MAP (dict):
+        A nested mapping of platform identifiers to speed-specific lanes configuration.
+        For each platform identifier, there is a dictionary
+        where keys are supported speed values and values are the number
+        of lanes required for that speed.
+
+    SPEED_FEC_MAP (dict):
+        A mapping of network speeds to their supported Forward Error
+        Correction (FEC) modes. The keys are speed values (as strings)
+        and the values are lists of FEC modes (e.g., "rs", "none").
+
+Usage:
+    These mappings enable quick lookups to validate supported configurations
+    for specific platforms, as in some times these mappings exist in
+    platform files but this is not always the case for all platforms.
+    They are used by test_port_speed_change.py.
+"""
+
+PLATFORM_SUPPORTED_SPEEDS_MAP = {
+    'x86_64-nokia_ixr7250e_36x400g-r0': ['100000', '400000']
+}
+
+PLATFORM_SPEED_LANES_MAP = {
+    'x86_64-nokia_ixr7250e_36x400g-r0': {
+        '100000': 4,
+        '400000': 8
+    }
+}
+
+SPEED_FEC_MAP = {
+        '100000': ["rs", "none"],
+        '400000': ["rs"]
+}