Cisco 11503 Administration Guide - Page 162

Frequently Queried Log Messages Chapter 4 Using the CSS Logging Features Table 4-8 Cisco 11500 Series CSS Log Messages (continued) Log Message (sys.log: Subsystem Name, Level, and Message) fp-driver FP_DRV-4: PrismImmFastPath::Send: Could not allocate an MCID. Remote message send aborted. Cause and Resolution The CSS MIPS processor attempts to send a group message, but the processor cannot obtain an multicast ID (MCID) from the Multicast ID Module (MID). The MID keeps track of the reference count on a buffer when the CSS sends a packet to multiple locations. The fast path uses an MCID to reference count the buffer with a contained packet that is being flooded to all ports in a VLAN. For MCIDs to be depleted in the CSS, there must be 1024 reference counted packets queued up in some combination of hardware queues and software queues. To fill up hardware queues, the CSS must receive a large number of packets, which it then chooses to flood out all ports. 4-42 Cisco Content Services Switch Administration Guide OL-5647-02