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Similar to __tfs_l2vpn, but configured for Layer 3 VPN:
1. Defines endpoint routers
2. Loads service template
3. Generates unique service UUID
4. Configures service endpoints
5. Adds QoS constraints
6. Prepares configuration rules for network interfaces
Args:
ietf_intent (dict): IETF-formatted network slice intent.
Returns:
dict: A TeraFlow service request for L3VPN configuration.
"""
# Hardcoded router endpoints
# TODO (should be dynamically determined)
origin_router_id = ietf_intent["ietf-network-slice-service:network-slice-services"]["slice-service"][0]["sdps"]["sdp"][0]["attachment-circuits"]["attachment-circuit"][0]["sdp-peering"]["peer-sap-id"]
origin_router_if = '0/0/0-GigabitEthernet0/0/0/0'
destination_router_id = ietf_intent["ietf-network-slice-service:network-slice-services"]["slice-service"][0]["sdps"]["sdp"][1]["attachment-circuits"]["attachment-circuit"][0]["sdp-peering"]["peer-sap-id"]
# Load L3VPN service template
self.__load_template(2, os.path.join(TEMPLATES_PATH, "L3-VPN_template_empty.json"))
tfs_request = json.loads(str(self.__teraflow_template))["services"][0]
# Generate unique service UUID
tfs_request["service_id"]["service_uuid"]["uuid"] += "-" + str(int(datetime.now().timestamp() * 1e7))
# Configure service endpoints
for endpoint in tfs_request["service_endpoint_ids"]:
endpoint["device_id"]["device_uuid"]["uuid"] = origin_router_id if endpoint is tfs_request["service_endpoint_ids"][0] else destination_router_id
endpoint["endpoint_uuid"]["uuid"] = origin_router_if if endpoint is tfs_request["service_endpoint_ids"][0] else destination_router_if
for i, constraint in enumerate(ietf_intent["ietf-network-slice-service:network-slice-services"]["slo-sle-templates"]["slo-sle-template"][0]["slo-policy"]["metric-bound"]):
bound = ietf_intent["ietf-network-slice-service:network-slice-services"]["slo-sle-templates"]["slo-sle-template"][0]["slo-policy"]["metric-bound"][i]["bound"]
metric_type = ietf_intent["ietf-network-slice-service:network-slice-services"]["slo-sle-templates"]["slo-sle-template"][0]["slo-policy"]["metric-bound"][i]["metric-type"]
metric_unit = ietf_intent["ietf-network-slice-service:network-slice-services"]["slo-sle-templates"]["slo-sle-template"][0]["slo-policy"]["metric-bound"][i]["metric-unit"]
service_constraint ={
"custom": {
"constraint_type": f"{metric_type}[{metric_unit}]",
"constraint_value": f"{bound}"
}
}
self.answer[self.subnet]["QoS Requirements"].append(service_constraint["custom"])
tfs_request["service_constraints"].append(service_constraint)
# Add configuration rules
for i, config_rule in enumerate(tfs_request["service_config"]["config_rules"][1:], start=1):
router_id = origin_router_id if i == 1 else destination_router_id
router_if = origin_router_if if i == 1 else destination_router_if
resource_value = config_rule["custom"]["resource_value"]
sdp_index = i - 1
vlan_value = ietf_intent["ietf-network-slice-service:network-slice-services"]["slice-service"][0]["sdps"]["sdp"][sdp_index]["service-match-criteria"]["match-criterion"][0]["value"]
resource_value["router_id"] = destination_router_id if i == 1 else origin_router_id
resource_value["vlan_id"] = int(vlan_value)
resource_value["address_ip"] = destination_router_id if i == 1 else origin_router_id
resource_value["policy_AZ"] = "policyA"
resource_value["policy_ZA"] = "policyB"
resource_value["ni_name"] = 'ELAN{:s}'.format(str(vlan_value))
config_rule["custom"]["resource_key"] = f"/device[{router_id}]/endpoint[{router_if}]/settings"
logging.info(f"L3VPN Intent realized\n")
self.answer[self.subnet]["VLAN"] = vlan_value
def __ixia(self, ietf_intent):
"""
Prepare an Ixia service request based on the IETF intent.
This method configures an Ixia service request by:
1. Defining endpoint routers
2. Loading a service template
3. Generating a unique service UUID
4. Configuring service endpoints
5. Adding QoS constraints
Args:
ietf_intent (dict): IETF-formatted network slice intent.
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Returns:
dict: An Ixia service request for configuration.
"""
self.answer[self.subnet]["QoS Requirements"] = []
# Add service constraints
for i, constraint in enumerate(ietf_intent["ietf-network-slice-service:network-slice-services"]["slo-sle-templates"]["slo-sle-template"][0]["slo-policy"]["metric-bound"]):
bound = ietf_intent["ietf-network-slice-service:network-slice-services"]["slo-sle-templates"]["slo-sle-template"][0]["slo-policy"]["metric-bound"][i]["bound"]
metric_type = ietf_intent["ietf-network-slice-service:network-slice-services"]["slo-sle-templates"]["slo-sle-template"][0]["slo-policy"]["metric-bound"][i]["metric-type"]
metric_unit = ietf_intent["ietf-network-slice-service:network-slice-services"]["slo-sle-templates"]["slo-sle-template"][0]["slo-policy"]["metric-bound"][i]["metric-unit"]
service_constraint ={
"custom": {
"constraint_type": f"{metric_type}[{metric_unit}]",
"constraint_value": f"{bound}"
}
}
self.answer[self.subnet]["QoS Requirements"].append(service_constraint["custom"])
self.answer[self.subnet]["VLAN"] = ietf_intent["ietf-network-slice-service:network-slice-services"]["slice-service"][0]["sdps"]["sdp"][0]["service-match-criteria"]["match-criterion"][0]["value"]
# Extraer la lista de métricas de forma segura
metric_bounds = ietf_intent.get("ietf-network-slice-service:network-slice-services", {}) \
.get("slo-sle-templates", {}) \
.get("slo-sle-template", [{}])[0] \
.get("slo-policy", {}) \
.get("metric-bound", [])
# Inicializar valores
bandwidth = None
latency = None
tolerance = None
# Asignar valores según el tipo de métrica
for metric in metric_bounds:
metric_type = metric.get("metric-type")
bound = metric.get("bound")
if metric_type == "one-way-bandwidth":
bandwidth = bound
elif metric_type == "one-way-delay-maximum":
latency = bound
elif metric_type == "one-way-delay-variation-maximum":
tolerance = bound
# Construcción del diccionario intent
intent = {
"src_node_ip": ietf_intent.get("ietf-network-slice-service:network-slice-services", {})
.get("slice-service", [{}])[0]
.get("sdps", {}).get("sdp", [{}])[0]
.get("attachment-circuits", {}).get("attachment-circuit", [{}])[0]
.get("sdp-peering", {}).get("peer-sap-id"),
"dst_node_ip": ietf_intent.get("ietf-network-slice-service:network-slice-services", {})
.get("slice-service", [{}])[0]
.get("sdps", {}).get("sdp", [{}, {}])[1]
.get("attachment-circuits", {}).get("attachment-circuit", [{}])[0]
.get("sdp-peering", {}).get("peer-sap-id"),
"vlan_id": ietf_intent.get("ietf-network-slice-service:network-slice-services", {})
.get("slice-service", [{}])[0]
.get("sdps", {}).get("sdp", [{}])[0]
.get("service-match-criteria", {}).get("match-criterion", [{}])[0]
.get("value"),
"bandwidth": bandwidth,
"latency": latency,
"tolerance": tolerance,
"latency_version": ietf_intent.get("ietf-network-slice-service:network-slice-services", {})
.get("slo-sle-templates", {}).get("slo-sle-template", [{}])[0]
.get("description"),
"reliability": ietf_intent.get("ietf-network-slice-service:network-slice-services", {})
.get("slo-sle-templates", {}).get("slo-sle-template", [{}])[0]
.get("sle-policy", {}).get("reliability"),
}
logging.info(f"IXIA Intent realized\n")
return intent