Introduce new rules for calculating recommended minimum links. #NAT-749

gso/utils/helpers.py

@@ -12,7 +12,7 @@ from pydantic_core.core_schema import ValidationInfo
 from pydantic_forms.validators import Choice
 
 from gso import settings
-from gso.products.product_blocks.iptrunk import IptrunkInterfaceBlock
+from gso.products.product_blocks.iptrunk import IptrunkInterfaceBlock, PhysicalPortCapacity
 from gso.products.product_blocks.router import RouterRole
 from gso.products.product_blocks.site import LatitudeCoordinate, LongitudeCoordinate, SiteTier
 from gso.products.product_types.router import Router
@@ -332,3 +332,18 @@ def generate_inventory_for_active_routers(
             }
         }
     }
+
+
+def calculate_recommended_minimum_links(iptrunk_number_of_members: int, iptrunk_speed: PhysicalPortCapacity) -> int:
+    """Calculate the recommended minimum number of links for an IP trunk based on the number of members and speed.
+
+    If the IP trunk speed is 400G, the recommended minimum number of links is the number of members minus 1.
+    Otherwise, the recommended minimum number of links is the number of members.
+
+    :param int iptrunk_number_of_members: The number of members in the IP trunk.
+    :param PhysicalPortCapacity iptrunk_speed: The speed of the IP trunk.
+    :return: The recommended minimum number of links for the IP trunk.
+    """
+    if iptrunk_speed == PhysicalPortCapacity.FOUR_HUNDRED_GIGABIT_PER_SECOND:
+        return iptrunk_number_of_members - 1
+    return iptrunk_number_of_members

gso/workflows/iptrunk/create_iptrunk.py

@@ -35,6 +35,7 @@ from gso.utils.helpers import (
     LAGMember,
     available_interfaces_choices,
     available_lags_choices,
+    calculate_recommended_minimum_links,
     get_router_vendor,
     validate_interface_name_list,
     validate_iptrunk_unique_interface,
@@ -70,12 +71,13 @@ def initial_input_form_generator(product_name: str) -> FormGenerator:
             return validate_tt_number(tt_number)
 
     initial_user_input = yield CreateIptrunkForm
+    recommended_minimum_links = calculate_recommended_minimum_links(
+        initial_user_input.iptrunk_number_of_members, initial_user_input.iptrunk_speed
+    )
 
     class VerifyMinimumLinksForm(FormPage):
-        info_label: Label = (
-            f"This is the calculated minimum-links for this LAG: " f"{initial_user_input.iptrunk_number_of_members - 1}"
-        )
-        iptrunk_minimum_links: int = initial_user_input.iptrunk_number_of_members - 1
+        info_label: Label = f"This is the calculated minimum-links for this LAG: {recommended_minimum_links}"
+        iptrunk_minimum_links: int = recommended_minimum_links
         info_label2: Label = "Please confirm or modify."
 
     verify_minimum_links = yield VerifyMinimumLinksForm

gso/workflows/iptrunk/modify_trunk_interface.py

@@ -28,6 +28,7 @@ from gso.utils.helpers import (
     LAGMember,
     available_interfaces_choices,
     available_interfaces_choices_including_current_members,
+    calculate_recommended_minimum_links,
     get_router_vendor,
     validate_interface_name_list,
     validate_iptrunk_unique_interface,
@@ -108,12 +109,15 @@ def initial_input_form_generator(subscription_id: UUIDstr) -> FormGenerator:
 
     initial_user_input = yield ModifyIptrunkForm
 
+    recommended_minimum_links = calculate_recommended_minimum_links(
+        initial_user_input.iptrunk_number_of_members, initial_user_input.iptrunk_speed
+    )
+
     class VerifyMinimumLinksForm(FormPage):
-        info_label: Label = (
-            f"This is the calculated minimum-links for this LAG: " f"{initial_user_input.iptrunk_number_of_members - 1}"
-        )
-        iptrunk_minimum_links: int = initial_user_input.iptrunk_number_of_members - 1
-        info_label2: Label = "Please confirm or modify."
+        info_label: Label = f"Current value of minimum-links : {subscription.iptrunk.iptrunk_minimum_links}"
+        info_label1: Label = f"Recommended minimum-links for this LAG: {recommended_minimum_links}"
+        iptrunk_minimum_links: int = recommended_minimum_links
+        info_label2: Label = "Please review the recommended value and adjust if necessary."
 
     verify_minimum_links = yield VerifyMinimumLinksForm
     ae_members_side_a = initialize_ae_members(subscription, initial_user_input.model_dump(), 0)