In the context of Cisco Secure Network Analytics (formerly known as Stealthwatch) and ISE (Identity Services Engine), pxGrid (Platform Exchange Grid) is used for sharing context-aware information across different security tools toenable rapid threat containment. When a malware-infected endpoint is detected, Cisco Secure Network Analytics can communicate with ISE using pxGrid to signal the need for quarantine.
This allows ISE to place the infected endpoint into a designated quarantine VLAN using an Adaptive Network Control policy, effectively isolating the threat and preventing it from spreading through the network.
References:
* Cisco's guide on pxGrid
* Cisco's solution overview on Rapid Threat Containment