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S-Series Debugging and Diagnostics | 1229
Buffer tuning commands
Configuration changes take effect immediately and appear in the running configuration. Since under
normal conditions all ports do not require the maximum possible allocation, the configured dynamic
allocations can exceed the actual amount of available memory; this is called oversubscription. If you
choose to oversubscribe the dynamic allocation, a burst of traffic on one interface might prevent other
interfaces 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 determines
that the sum of the configured dedicated buffers allocated to the queues is more than the total available
memory, 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 default
buffer profile using the command
show buffer-profile {summary | detail} from EXEC Privilege mode, as
shown in Figure 62-7.
Task Command Command Mode
Define a buffer profile for the FP queues.
buffer-profile fp fsqueue
CONFIGURATION
Define a buffer profile for the CSF queues.
buffer-profile csf csqueue
CONFIGURATION
Change the dedicated buffers on a physical 1G
interface.
buffer dedicated
BUFFER PROFILE
Change the maximum amount of dynamic buffers
an interface can request.
buffer dynamic
BUFFER PROFILE
Change the number of packet-pointers per queue.
buffer packet-pointers
BUFFER PROFILE
Apply the buffer profile to a line card.
buffer fp-uplink linecard
CONFIGURATION
Apply the buffer profile to a CSF to FP link.
buffer csf linecard
CONFIGURATION
FTOS Behavior: If you attempt to apply a buffer profile to a non-existent port-pipe, FTOS displays the
following 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. Valid
range of port-set is <0-1>
Table 62-2. Buffer Allocation Error
00:04:20: %S50N:0 %DIFFSERV-2-DSA_DEVICE_BUFFER_UNAVAILABLE: Unable to allocate dedicated buffers for
stack-unit 0, port pipe 0, egress port 25 due to unavailability of cells
FTOS Behavior: When you remove a buffer-profile using the command no buffer-profile [fp | csf] from
CONFIGURATION 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, but
the profile name remains. Remove it from the show buffer-profile [detail | summary] command output
by entering no buffer [fp-uplink |csf] linecard port-set buffer-policy from CONFIGURATION mode
and no buffer-policy from INTERFACE mode.