Cisco PSA Microcode MIB - Overview The PSA is the Packet Switching ASIC used in module like engine 2(E2) line cards in GSR for IP and MPLS packets forwarding. The PSA performs IP and MPLS packet forwarding at 4 Mpps. The list of features supported by the PSA includes (but is not limited to): - Input and Output ACLs - Frame Relay Switching - PIRC - MPLS VPN - BGP policy accounting - IP packet coloring - Sampled Net flow - ATM over MPLS. - Source MAC Accounting. - Unicast RPF Note that all the features are not supported simultaneously on a module. Each microcode bundle/set can support one or a limited number of the features listed above. Each feature has a priority. When a feature (ACL, Sampled NetFlow) is enabled through the CLI, the higher priority feature will take precedence over the lower priority feature. The microcode for the lower priority is removed and cleaned up. The higher priority microcode will be loaded. Later, if the higher priority feature is removed, the lower priority microcode will be loaded again. This MIB contains information about the microcode bundles on modules like E2 Line Cards(LC) in GSR. Since microcode reload is a service interrupting event, this MIB also defines a notification to inform management stations that such an event has taken place.