Reference Guide

• Define a buffer profile for the CSF queues.
CONFIGURATION mode
buffer-profile csf csqueue
• Change the dedicated buffers on a physical 1G interface.
BUFFER PROFILE mode
buffer dedicated
• Change the maximum number of dynamic buffers an interface can request.
BUFFER PROFILE mode
buffer dynamic
• Change the number of packet-pointers per queue.
BUFFER PROFILE mode
buffer packet-pointers
• Apply the buffer profile to a line card.
CONFIGURATION mode
buffer fp-uplink linecard
• Apply the buffer profile to a CSF to FP link.
CONFIGURATION mode
buffer csf linecard
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>
Configuration changes take effect immediately and appear in the running configuration. Because, under normal
conditions, all ports do not require the maximum 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.
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 no buffer-profile [fp | csf] command from
CONFIGURATION mode, the buffer-profile name still appears in the output of the show buffer-profile
[detail | summary] command. 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 the no buffer [fp-uplink |csf] linecard port-set buffer-policy command
from CONFIGURATION mode and the
no buffer-policy command from INTERFACE mode.
Display the allocations for any buffer profile using the show commands, shown in the following examples. Display the
default buffer profile using the
show buffer-profile {summary | detail} command from EXEC Privilege
mode, also shown in the following examples.
Displaying the Default Buffer Profile
FTOS#show buffer-profile detail interface gigabitethernet 0/1
Interface Gi 0/1
Buffer-profile -
775