Cisco router security bundles support the delivery of security features such as Cisco IOS Software-based intrusion prevention systems (IPS), firewall, URL filtering, VPN, and infrastructure security services over numerous WAN access technologies, offering the highest levels of performance, security, scalability, and availability to meet today's growing business requirements. Cisco Catalyst 6500 Series security bundles are based on the Cisco Catalyst 6500 Series E chassis and the IPSec VPN Shared Port Adapter (SPA) or Firewall Services Module.WS-C6504-E-VPN+-K9 is a Cisco Catalyst 6504E IPSec VPN SPA Security System with Supervisor Engine 720-3B, IPSec VPN SPA, Services SPA Carrier Card, fan tray modules and IOS release 12.2(18)SXF.