S-Series Debugging and Diagnostics | 1229Buffer tuning commandsConfiguration changes take effect immediately and appear in the running configuration. Since undernormal conditions all ports do not require the maximum possible allocation, the configured dynamicallocations can exceed the actual amount of available memory; this is called oversubscription. If youchoose to oversubscribe the dynamic allocation, a burst of traffic on one interface might prevent otherinterfaces from receiving the configured dynamic allocation, which causes packet loss.You cannot allocate more than the available memory for the dedicated buffers. If the system determinesthat the sum of the configured dedicated buffers allocated to the queues is more than the total availablememory, the configuration is rejected, returning a syslog message similar to the following.Display the allocations for any buffer profile using the show commands in Figure 62-8. Display the defaultbuffer profile using the command show buffer-profile {summary | detail} from EXEC Privilege mode, asshown in Figure 62-7.Task Command Command ModeDefine a buffer profile for the FP queues. buffer-profile fp fsqueue CONFIGURATIONDefine a buffer profile for the CSF queues. buffer-profile csf csqueue CONFIGURATIONChange the dedicated buffers on a physical 1Ginterface.buffer dedicated BUFFER PROFILEChange the maximum amount of dynamic buffersan interface can request.buffer dynamic BUFFER PROFILEChange the number of packet-pointers per queue. buffer packet-pointers BUFFER PROFILEApply the buffer profile to a line card. buffer fp-uplink linecard CONFIGURATIONApply the buffer profile to a CSF to FP link. buffer csf linecard CONFIGURATIONFTOS Behavior: If you attempt to apply a buffer profile to a non-existent port-pipe, FTOS displays thefollowing message. However, the configuration still appears in the running-config.%DIFFSERV-2-DSA_BUFF_CARVING_INVALID_PORT_SET: Invalid FP port-set 2 for linecard 2. Validrange of port-set is <0-1>Table 62-2. Buffer Allocation Error00:04:20: %S50N:0 %DIFFSERV-2-DSA_DEVICE_BUFFER_UNAVAILABLE: Unable to allocate dedicated buffers forstack-unit 0, port pipe 0, egress port 25 due to unavailability of cellsFTOS Behavior: When you remove a buffer-profile using the command no buffer-profile [fp | csf] fromCONFIGURATION mode, the buffer-profile name still appears in the output of show buffer-profile[detail | summary]. After a line card reset, the buffer profile correctly returns to the default values, butthe profile name remains. Remove it from the show buffer-profile [detail | summary] command outputby entering no buffer [fp-uplink |csf] linecard port-set buffer-policy from CONFIGURATION modeand no buffer-policy from INTERFACE mode.
