Delivering Cisco IOS™-based enterprise routing into one embedded slot, VPX3-621 Cisco Systems® 5921 Embedded Services Router (ESR) Software 3U VPX module supports Cisco IOS running as software router and is suited for SWaP-C constrained environments. Board can be used to connect embedded systems to IP-based WANs, enhance network security with firewall and intrusion detection capabilities, and add mobile IP networking capabilities to vehicles with multiple data links.