SDN Complete Guide | Software-Defined Networking Architecture & Implementation

When Traditional Networks Can't Keep Pace with Digital Transformation

Your development team needs to deploy a new microservices application. They require:

• 🚀 Instant network provisioning in minutes, not days
• 🔄 Dynamic security policies that follow workloads
• 📊 Real-time visibility into application performance
• 🌐 Multi-cloud consistency across environments

But your traditional network responds with:

• ❌ Manual CLI configurations taking days to implement
• ❌ Static security policies that can't follow virtual machines
• ❌ Limited visibility into application dependencies
• ❌ Inconsistent policies across different environments

The result? Development delays, security gaps, and operational complexity that stifle innovation.

Welcome to Software-Defined Networking (SDN) - where networks become as agile as the applications they support.

SDN Architecture: Separating Control and Data Planes

Traditional vs SDN Architecture:

Traditional Network:
[ Control Plane ] ← Embedded in each device
[ Data Plane ]    ← Forwarding decisions per device

SDN Architecture:
[ SDN Controller ] ← Centralized intelligence
[ Southbound API ] ← Communication protocol (OpenFlow)
[ Network Devices ] ← Simplified data plane only

SDN Components Overview:

Component	Traditional Network	SDN	Benefits
Control Plane	Distributed per device	Centralized controller	Consistent policies
Management	CLI per device	API-driven automation	Faster provisioning
Visibility	Limited per device	Network-wide view	Better troubleshooting
Innovation	Vendor-dependent	Open APIs	Faster feature development

Cisco Application Centric Infrastructure (ACI)

ACI Architecture Components:

#!/usr/bin/env python3
"""
Cisco ACI Configuration with Python
🔴 Red - Tenant and Application Profile configuration
🟠 Orange - Endpoint Group (EPG) settings
🟡 Yellow - Contract and policy definitions  
🟢 Green - Physical domain configurations
🔵 Blue - Monitoring and analytics
"""

from cobra.mit.access import MoDirectory
from cobra.mit.session import LoginSession
from cobra.model.pol import Uni
from cobra.model.fv import Tenant, Ctx, BD, Ap, AEPg
from cobra.model.vz import BrCP, Subj, RsSubjFiltAtt
import json

class CiscoACIManager:
    def __init__(self, apic_ip, username, password):
        self.apic_ip = apic_ip
        self.username = username
        self.password = password
        self.session = None
        self.md = None
        
    def connect(self):
        """🔴 Connect to APIC controller"""
        print("🔴 Connecting to Cisco APIC...")
        try:
            self.session = LoginSession(f'https://{self.apic_ip}', self.username, self.password)
            self.md = MoDirectory(self.session)
            self.md.login()
            print("✅ Successfully connected to APIC")
            return True
        except Exception as e:
            print(f"❌ Connection failed: {str(e)}")
            return False
    
    def create_tenant(self, tenant_name, description=""):
        """🔴 Create ACI Tenant"""
        print(f"🔴 Creating tenant: {tenant_name}")
        
        # Get the top-level policy universe
        polUni = Uni('')
        
        # Create tenant
        tenant = Tenant(polUni, tenant_name, descr=description)
        
        # Commit configuration
        self.md.commit(tenant)
        print(f"✅ Tenant {tenant_name} created successfully")
        return tenant
    
    def create_application_profile(self, tenant, app_profile_name):
        """🟠 Create Application Profile"""
        print(f"🟠 Creating application profile: {app_profile_name}")
        
        app_profile = Ap(tenant, app_profile_name)
        self.md.commit(app_profile)
        print(f"✅ Application Profile {app_profile_name} created")
        return app_profile
    
    def create_endpoint_group(self, app_profile, epg_name, bd_name):
        """🟠 Create Endpoint Group (EPG)"""
        print(f"🟠 Creating EPG: {epg_name}")
        
        epg = AEPg(app_profile, epg_name)
        
        # Associate with Bridge Domain
        from cobra.model.fv import RsBd
        RsBd(epg, tnFvBDName=bd_name)
        
        self.md.commit(epg)
        print(f"✅ EPG {epg_name} created and associated with BD {bd_name}")
        return epg
    
    def create_contract(self, tenant, contract_name, subjects):
        """🟡 Create Contract for communication policies"""
        print(f"🟡 Creating contract: {contract_name}")
        
        contract = BrCP(tenant, contract_name)
        
        for subject_name, filters in subjects.items():
            subject = Subj(contract, subject_name)
            
            for filter_name in filters:
                RsSubjFiltAtt(subject, tnVzFilterName=filter_name)
        
        self.md.commit(contract)
        print(f"✅ Contract {contract_name} created with {len(subjects)} subjects")
        return contract

# Example usage
def main():
    # Initialize ACI Manager
    aci_mgr = CiscoACIManager('10.1.100.100', 'admin', 'SecurePass123!')
    
    if aci_mgr.connect():
        # Create tenant for application
        tenant = aci_mgr.create_tenant('WebApp-Tenant', 'Three-tier web application')
        
        # Create application profile
        app_profile = aci_mgr.create_application_profile(tenant, 'Ecommerce-App')
        
        # Create EPGs for each tier
        web_epg = aci_mgr.create_endpoint_group(app_profile, 'Web-Tier', 'Web-BD')
        app_epg = aci_mgr.create_endpoint_group(app_profile, 'App-Tier', 'App-BD') 
        db_epg = aci_mgr.create_endpoint_group(app_profile, 'DB-Tier', 'DB-BD')
        
        # Define communication contracts
        contracts = {
            'Web-to-App': ['http', 'https'],
            'App-to-DB': ['sql-server']
        }
        aci_mgr.create_contract(tenant, 'App-Communication', contracts)
        
        print("\n🎯 ACI Application-Centric Configuration Complete!")

if __name__ == "__main__":
    main()

VMware NSX-T Data Center Implementation

NSX-T Architecture and Configuration:

# 🟣 NSX-T Configuration Overview
NSX_Manager:
  🔴 Management Plane: NSX Manager
  🟠 Control Plane: Control Cluster
  🟡 Data Plane: Transport Nodes

Networking:
  🟢 Logical Switches: Overlay networks
  🔵 Logical Routers: Distributed routing
  🟣 Transport Zones: VLAN/VXLAN

Security:
  🟤 Distributed Firewall: Micro-segmentation
  🟠 Service Insertion: Advanced services
  🔴 Gateway Firewall: North-South protection

NSX-T Python Automation:

#!/usr/bin/env python3
"""
VMware NSX-T Automation with Python
🔴 Red - NSX Manager operations
🟠 Orange - Logical switching configuration
🟡 Yellow - Security policy automation
🟢 Green - Monitoring and troubleshooting
🔵 Blue - Integration with vSphere
"""

import requests
import json
import urllib3

# Disable SSL warnings for lab environments
urllib3.disable_warnings(urllib3.exceptions.InsecureRequestWarning)

class NSXTManager:
    def __init__(self, nsx_manager, username, password):
        self.nsx_manager = nsx_manager
        self.base_url = f"https://{nsx_manager}/api/v1"
        self.session = requests.Session()
        self.session.auth = (username, password)
        self.session.verify = False  # In production, use proper certificates
        self.headers = {'Content-Type': 'application/json'}
    
    def create_logical_switch(self, switch_name, transport_zone_id, vlan_id=None):
        """🟠 Create logical switch in NSX-T"""
        print(f"🟠 Creating logical switch: {switch_name}")
        
        logical_switch_config = {
            "display_name": switch_name,
            "transport_zone_id": transport_zone_id,
            "admin_state": "UP",
            "replication_mode": "MTEP"
        }
        
        if vlan_id:
            logical_switch_config["vlan"] = vlan_id
        
        url = f"{self.base_url}/logical-switches"
        response = self.session.post(
            url, 
            data=json.dumps(logical_switch_config),
            headers=self.headers
        )
        
        if response.status_code == 201:
            print(f"✅ Logical switch {switch_name} created successfully")
            return response.json()
        else:
            print(f"❌ Failed to create logical switch: {response.text}")
            return None
    
    def create_distributed_firewall_rule(self, rule_name, source_groups, destination_groups, services, action="ALLOW"):
        """🟡 Create distributed firewall rule"""
        print(f"🟡 Creating DFW rule: {rule_name}")
        
        firewall_rule = {
            "display_name": rule_name,
            "source_groups": source_groups,
            "destination_groups": destination_groups,
            "services": services,
            "action": action,
            "logged": False,
            "disabled": False
        }
        
        url = f"{self.base_url}/firewall/rules"
        response = self.session.post(
            url,
            data=json.dumps(firewall_rule),
            headers=self.headers
        )
        
        if response.status_code == 201:
            print(f"✅ DFW rule {rule_name} created successfully")
            return response.json()
        else:
            print(f"❌ Failed to create DFW rule: {response.text}")
            return None
    
    def enable_microsegmentation(self, security_group_name, inclusion_criteria):
        """🟢 Configure micro-segmentation security groups"""
        print(f"🟢 Configuring micro-segmentation: {security_group_name}")
        
        security_group = {
            "display_name": security_group_name,
            "expression": inclusion_criteria
        }
        
        url = f"{self.base_url}/ns-groups"
        response = self.session.post(
            url,
            data=json.dumps(security_group),
            headers=self.headers
        )
        
        if response.status_code == 201:
            print(f"✅ Security group {security_group_name} created")
            return response.json()
        else:
            print(f"❌ Failed to create security group: {response.text}")
            return None

# Example usage
def nsxt_automation_example():
    """🔵 Complete NSX-T automation example"""
    nsxt = NSXTManager('nsxt-manager.company.com', 'admin', 'SecurePass123!')
    
    # Create logical switches for application tiers
    transport_zone_id = "tz-12345678-1234-1234-1234-123456789012"
    
    logical_switches = [
        {"name": "Web-Tier-LS", "vlan": 100},
        {"name": "App-Tier-LS", "vlan": 200},
        {"name": "DB-Tier-LS", "vlan": 300}
    ]
    
    created_switches = {}
    for switch in logical_switches:
        result = nsxt.create_logical_switch(
            switch["name"], 
            transport_zone_id, 
            switch["vlan"]
        )
        if result:
            created_switches[switch["name"]] = result["id"]
    
    # Configure micro-segmentation
    security_groups = {
        "Web-Servers": ["VM.name contains 'web'"],
        "App-Servers": ["VM.name contains 'app'"],
        "Database-Servers": ["VM.name contains 'db'"]
    }
    
    for sg_name, criteria in security_groups.items():
        nsxt.enable_microsegmentation(sg_name, criteria)
    
    # Create firewall rules
    firewall_rules = [
        {
            "name": "Allow-Web-to-App",
            "sources": ["Web-Servers"],
            "destinations": ["App-Servers"],
            "services": ["/infra/services/HTTP", "/infra/services/HTTPS"]
        },
        {
            "name": "Allow-App-to-DB", 
            "sources": ["App-Servers"],
            "destinations": ["Database-Servers"],
            "services": ["/infra/services/MS-SQL"]
        }
    ]
    
    for rule in firewall_rules:
        nsxt.create_distributed_firewall_rule(
            rule["name"],
            rule["sources"],
            rule["destinations"], 
            rule["services"]
        )
    
    print("\n🎯 NSX-T Micro-segmentation Configuration Complete!")

if __name__ == "__main__":
    nsxt_automation_example()

Open Source SDN with OpenDaylight and Open vSwitch

OpenDaylight Controller Configuration:

#!/usr/bin/env python3
"""
OpenDaylight SDN Controller Automation
🔴 Red - OpenDaylight REST API operations
🟠 Orange - Flow programming with OpenFlow
🟡 Yellow - Network topology discovery
🟢 Green - Switch configuration
🔵 Blue - Monitoring and statistics
"""

import requests
import json
from datetime import datetime

class OpenDaylightManager:
    def __init__(self, controller_ip, username, password):
        self.controller_ip = controller_ip
        self.base_url = f"http://{controller_ip}:8181/restconf"
        self.auth = (username, password)
        self.headers = {
            'Content-Type': 'application/json',
            'Accept': 'application/json'
        }
    
    def get_network_topology(self):
        """🟡 Get current network topology"""
        print("🟡 Retrieving network topology...")
        
        url = f"{self.base_url}/operational/network-topology:network-topology"
        response = requests.get(url, auth=self.auth, headers=self.headers)
        
        if response.status_code == 200:
            topology = response.json()
            print("✅ Network topology retrieved successfully")
            return topology
        else:
            print(f"❌ Failed to get topology: {response.text}")
            return None
    
    def get_switches(self):
        """🟢 Get list of connected switches"""
        print("🟢 Retrieving connected switches...")
        
        url = f"{self.base_url}/operational/opendaylight-inventory:nodes"
        response = requests.get(url, auth=self.auth, headers=self.headers)
        
        if response.status_code == 200:
            nodes = response.json()
            switches = []
            
            for node in nodes.get('nodes', {}).get('node', []):
                if 'openflow' in node['id']:
                    switches.append({
                        'id': node['id'],
                        'description': node.get('flow-node-inventory:description', 'N/A')
                    })
            
            print(f"✅ Found {len(switches)} OpenFlow switches")
            return switches
        else:
            print(f"❌ Failed to get switches: {response.text}")
            return None
    
    def install_flow(self, switch_id, flow_config):
        """🟠 Install flow on OpenFlow switch"""
        print(f"🟠 Installing flow on switch {switch_id}...")
        
        url = f"{self.base_url}/config/opendaylight-inventory:nodes/node/{switch_id}/flow-node-inventory:table/0"
        response = requests.post(
            url,
            data=json.dumps(flow_config),
            auth=self.auth,
            headers=self.headers
        )
        
        if response.status_code in [200, 201, 204]:
            print("✅ Flow installed successfully")
            return True
        else:
            print(f"❌ Failed to install flow: {response.text}")
            return False
    
    def create_qos_flow(self, switch_id, priority, match, actions, queue_id):
        """🔵 Create QoS flow for traffic prioritization"""
        print(f"🔵 Creating QoS flow on switch {switch_id}...")
        
        flow_config = {
            "flow-node-inventory:flow": [
                {
                    "id": f"qos-flow-{priority}",
                    "priority": priority,
                    "match": match,
                    "instructions": {
                        "instruction": [
                            {
                                "order": 0,
                                "apply-actions": {
                                    "action": actions
                                }
                            },
                            {
                                "order": 1,
                                "go-to-table": {
                                    "table_id": 1
                                }
                            }
                        ]
                    }
                }
            ]
        }
        
        return self.install_flow(switch_id, flow_config)

# Example usage
def openflow_automation():
    """🔴 Complete OpenFlow automation example"""
    odl = OpenDaylightManager('10.1.100.50', 'admin', 'admin')
    
    # Discover network topology
    topology = odl.get_network_topology()
    
    # Get connected switches
    switches = odl.get_switches()
    
    if switches:
        for switch in switches[:2]:  # Configure first two switches
            switch_id = switch['id']
            
            # Create voice traffic QoS flow
            voice_flow_match = {
                "ethernet-match": {
                    "ethernet-type": {"type": 2048}
                },
                "ip-match": {"ip-protocol": 17},
                "udp-destination-port": 16384
            }
            
            voice_flow_actions = [
                {
                    "order": 0,
                    "set-queue-action": {"queue-id": 4}
                }
            ]
            
            odl.create_qos_flow(
                switch_id,
                priority=1000,
                match=voice_flow_match,
                actions=voice_flow_actions,
                queue_id=4
            )
            
            # Create video traffic QoS flow
            video_flow_match = {
                "ethernet-match": {
                    "ethernet-type": {"type": 2048}
                },
                "ip-match": {"ip-protocol": 17},
                "udp-destination-port": 16385
            }
            
            video_flow_actions = [
                {
                    "order": 0,
                    "set-queue-action": {"queue-id": 3}
                }
            ]
            
            odl.create_qos_flow(
                switch_id, 
                priority=900,
                match=video_flow_match,
                actions=video_flow_actions,
                queue_id=3
            )
    
    print("\n🎯 OpenFlow QoS Configuration Complete!")

if __name__ == "__main__":
    openflow_automation()

SD-WAN: Software-Defined Wide Area Networking

SD-WAN Architecture and Benefits:

#!/usr/bin/env python3
"""
SD-WAN Configuration and Monitoring
🔴 Red - Cisco SD-WAN (Viptela) configuration
🟠 Orange - VMware SD-WAN (Velocloud) setup
🟡 Yellow - Path selection and quality monitoring
🟢 Green - Security policy application
🔵 Blue - Application-aware routing
"""

import requests
import json
import time
from dataclasses import dataclass
from typing import Dict, List

@dataclass
class SDWANConnection:
    interface: str
    type: str  # MPLS, Internet, LTE, etc.
    cost: int
    quality: float
    status: str

class SDWANManager:
    def __init__(self, vmanage_ip, username, password):
        self.vmanage_ip = vmanage_ip
        self.base_url = f"https://{vmanage_ip}/dataservice"
        self.session = requests.Session()
        self.session.verify = False
        self.login(username, password)
    
    def login(self, username, password):
        """🔴 Authenticate with vManage"""
        print("🔴 Authenticating with SD-WAN controller...")
        
        login_data = {
            "j_username": username,
            "j_password": password
        }
        
        response = self.session.post(
            f"https://{self.vmanage_ip}/j_security_check",
            data=login_data
        )
        
        if response.status_code == 200:
            print("✅ Successfully authenticated with vManage")
        else:
            print(f"❌ Authentication failed: {response.status_code}")
    
    def get_device_list(self):
        """🟢 Get list of SD-WAN devices"""
        print("🟢 Retrieving SD-WAN devices...")
        
        url = f"{self.base_url}/device"
        response = self.session.get(url)
        
        if response.status_code == 200:
            devices = response.json()['data']
            print(f"✅ Found {len(devices)} SD-WAN devices")
            return devices
        else:
            print(f"❌ Failed to get devices: {response.text}")
            return []
    
    def get_connection_quality(self, device_id):
        """🟡 Get connection quality metrics"""
        print(f"🟡 Checking connection quality for device {device_id}...")
        
        url = f"{self.base_url}/device/bfd/sites?deviceId={device_id}"
        response = self.session.get(url)
        
        if response.status_code == 200:
            quality_data = response.json()['data']
            
            connections = []
            for connection in quality_data:
                connections.append(SDWANConnection(
                    interface=connection.get('local-color', 'Unknown'),
                    type=connection.get('color', 'Unknown'),
                    cost=connection.get('cost', 0),
                    quality=connection.get('latency', 999),
                    status=connection.get('state', 'down')
                ))
            
            return connections
        else:
            print(f"❌ Failed to get connection quality: {response.text}")
            return []
    
    def create_app_route_policy(self, policy_name, applications, preferred_path):
        """🔵 Create application-aware routing policy"""
        print(f"🔵 Creating app-route policy: {policy_name}")
        
        policy_config = {
            "name": policy_name,
            "sequences": [
                {
                    "sequenceName": "Priority-Apps",
                    "sequenceType": "appRoute",
                    "match": {
                        "applicationList": applications
                    },
                    "actions": [
                        {
                            "type": "backupSlaPreferredColor",
                            "preferredColor": preferred_path
                        }
                    ]
                }
            ]
        }
        
        url = f"{self.base_url}/template/policy/approute"
        response = self.session.post(url, json=policy_config)
        
        if response.status_code == 200:
            print(f"✅ App-route policy {policy_name} created")
            return response.json()
        else:
            print(f"❌ Failed to create policy: {response.text}")
            return None
    
    def monitor_application_performance(self, application_name, duration_minutes=5):
        """🟠 Monitor application performance across paths"""
        print(f"🟠 Monitoring {application_name} performance...")
        
        end_time = int(time.time() * 1000)
        start_time = end_time - (duration_minutes * 60 * 1000)
        
        url = f"{self.base_url}/statistics/approute"
        params = {
            "app": application_name,
            "startTime": start_time,
            "endTime": end_time
        }
        
        response = self.session.get(url, params=params)
        
        if response.status_code == 200:
            stats = response.json()['data']
            
            print(f"📊 Application Performance for {application_name}:")
            for stat in stats:
                path = stat.get('local-color', 'Unknown')
                latency = stat.get('avg-latency', 'N/A')
                jitter = stat.get('avg-jitter', 'N/A')
                loss = stat.get('loss-percentage', 'N/A')
                
                print(f"   {path}: Latency={latency}ms, Jitter={jitter}ms, Loss={loss}%")
            
            return stats
        else:
            print(f"❌ Failed to get performance stats: {response.text}")
            return []

# Example usage
def sdwan_automation():
    """🔴 Complete SD-WAN automation example"""
    sdwan = SDWANManager('vmanage.company.com', 'admin', 'SecurePass123!')
    
    # Get device inventory
    devices = sdwan.get_device_list()
    
    # Monitor connection quality for each device
    for device in devices[:3]:  # First 3 devices
        device_id = device['deviceId']
        device_name = device['host-name']
        
        print(f"\n📡 Checking {device_name}...")
        connections = sdwan.get_connection_quality(device_id)
        
        for conn in connections:
            status_icon = "🟢" if conn.status == "up" else "🔴"
            print(f"   {status_icon} {conn.interface} ({conn.type}): "
                  f"Cost={conn.cost}, Quality={conn.quality}ms")
    
    # Create application-aware routing policy
    critical_apps = ["webex-teams", "office365", "salesforce"]
    sdwan.create_app_route_policy(
        "Business-Critical-Apps",
        critical_apps,
        "biz-internet"
    )
    
    # Monitor application performance
    sdwan.monitor_application_performance("webex-teams")
    
    print("\n🎯 SD-WAN Automation Complete!")

if __name__ == "__main__":
    sdwan_automation()

SDN Security and Micro-Segmentation

Zero Trust Security Implementation:

#!/usr/bin/env python3
"""
SDN Security and Zero Trust Implementation
🔴 Red - Security policy enforcement
🟠 Orange - Threat detection and response
🟡 Yellow - Micro-segmentation configuration
🟢 Green - Compliance monitoring
🔵 Blue - API security
"""

class SDNSecurityManager:
    def __init__(self):
        self.security_policies = {}
        self.threat_feeds = []
        self.compliance_rules = {}
    
    def create_microsegmentation_policy(self, policy_name, source_group, dest_group, allowed_services):
        """🟡 Create micro-segmentation security policy"""
        print(f"🟡 Creating micro-segmentation policy: {policy_name}")
        
        policy = {
            'name': policy_name,
            'source_group': source_group,
            'destination_group': dest_group,
            'allowed_services': allowed_services,
            'action': 'ALLOW',
            'logging': True,
            'enabled': True
        }
        
        self.security_policies[policy_name] = policy
        print(f"✅ Micro-segmentation policy '{policy_name}' created")
        return policy
    
    def enable_threat_intelligence(self, threat_feed_urls):
        """🟠 Enable threat intelligence feeds"""
        print("🟠 Configuring threat intelligence feeds...")
        
        for feed_url in threat_feed_urls:
            self.threat_feeds.append({
                'url': feed_url,
                'last_update': None,
                'enabled': True
            })
            print(f"✅ Added threat feed: {feed_url}")
    
    def implement_zero_trust_rules(self):
        """🔴 Implement Zero Trust security rules"""
        print("🔴 Implementing Zero Trust security rules...")
        
        zero_trust_rules = [
            {
                'name': 'ZT-Deny-By-Default',
                'description': 'Default deny all traffic',
                'action': 'DENY',
                'priority': 65535
            },
            {
                'name': 'ZT-Require-Authentication', 
                'description': 'Require authentication for all east-west traffic',
                'action': 'AUTHENTICATE',
                'priority': 1
            },
            {
                'name': 'ZT-Log-All-Flows',
                'description': 'Log all network flows for audit',
                'action': 'ALLOW_LOG',
                'priority': 1000
            }
        ]
        
        for rule in zero_trust_rules:
            self.security_policies[rule['name']] = rule
            print(f"✅ Zero Trust rule '{rule['name']}' implemented")
    
    def monitor_compliance(self, compliance_standard):
        """🟢 Monitor security compliance"""
        print(f"🟢 Monitoring compliance with {compliance_standard}...")
        
        compliance_checks = {
            'NIST': [
                'Check for default credentials',
                'Verify encryption in transit',
                'Validate access controls',
                'Audit logging enabled'
            ],
            'PCI-DSS': [
                'Network segmentation verified',
                'Cardholder data encrypted',
                'Access logs maintained', 
                'Security monitoring active'
            ],
            'HIPAA': [
                'PHI data protected',
                'Access controls enforced',
                'Audit trails maintained',
                'Security incidents monitored'
            ]
        }
        
        checks = compliance_checks.get(compliance_standard, [])
        results = {}
        
        for check in checks:
            # Simulate compliance check
            results[check] = 'PASS'  # In real implementation, actually perform checks
        
        print(f"✅ Compliance monitoring for {compliance_standard} completed")
        return results

# Example usage
def sdn_security_demo():
    """🔵 SDN Security Implementation Demo"""
    security_mgr = SDNSecurityManager()
    
    print("🛡️  SDN Security Implementation")
    print("=" * 50)
    
    # Implement Zero Trust
    security_mgr.implement_zero_trust_rules()
    
    # Create micro-segmentation policies
    app_segments = [
        {'source': 'Web-Servers', 'dest': 'App-Servers', 'services': ['HTTP', 'HTTPS']},
        {'source': 'App-Servers', 'dest': 'Database-Servers', 'services': ['SQL']},
        {'source': 'Admin-Stations', 'dest': 'All-Servers', 'services': ['SSH', 'RDP']}
    ]
    
    for segment in app_segments:
        policy_name = f"Allow-{segment['source']}-to-{segment['dest']}"
        security_mgr.create_microsegmentation_policy(
            policy_name,
            segment['source'],
            segment['dest'], 
            segment['services']
        )
    
    # Enable threat intelligence
    threat_feeds = [
        'https://feeds.company.com/malware-ips',
        'https://feeds.company.com/suspicious-domains',
        'https://feeds.company.com/known-attackers'
    ]
    security_mgr.enable_threat_intelligence(threat_feeds)
    
    # Monitor compliance
    compliance_results = security_mgr.monitor_compliance('NIST')
    
    print(f"\n📊 Security Summary:")
    print(f"   Policies: {len(security_mgr.security_policies)}")
    print(f"   Threat Feeds: {len(security_mgr.threat_feeds)}")
    print(f"   Compliance Checks: {len(compliance_results)}")
    
    print("\n🎯 SDN Security Implementation Complete!")

if __name__ == "__main__":
    sdn_security_demo()

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