Administrator Guide

• Reduce the dedicated buer on all queues/interfaces.
• Increase the dynamic buer on all interfaces.
• Increase the cell pointers on a queue that you are expecting will receive the largest number of packets.
To dene, change, and apply buers, use the following commands.
• Dene a buer prole for the FP queues.
CONFIGURATION mode
buffer-profile fp fsqueue
• Dene a buer prole for the CSF queues.
CONFIGURATION mode
buffer-profile csf csqueue
• Change the dedicated buers on a physical 1G interface.
BUFFER PROFILE mode
buffer dedicated
• Change the maximum number of dynamic buers 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 buer prole to a CSF to FP link.
CONFIGURATION mode
buffer csf linecard
Dell Networking OS Behavior: If you attempt to apply a buer prole to a non-existent port-pipe, the system displays the following
message: %DIFFSERV-2-DSA_BUFF_CARVING_INVALID_PORT_SET: Invalid FP port-set 2 for linecard 2.
Valid range of port-set is <0-1>. However, the conguration still appears in the running-cong.
Conguration changes take eect immediately and appear in the running conguration. Because under normal conditions all ports do
not require the maximum allocation, the congured dynamic allocations can exceed the actual amount of available memory; this
allocation is called oversubscription. If you choose to oversubscribe the dynamic allocation, a burst of trac on one interface might
prevent other interfaces from receiving the congured dynamic allocation, which causes packet loss.
You cannot allocate more than the available memory for the dedicated buers. If the system determines that the sum of the
congured dedicated buers allocated to the queues is more than the total available memory, the conguration 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.
Dell Networking OS Behavior: When you remove a buer-prole using the no buffer-profile [fp | csf] command from
CONFIGURATION mode, the buer-prole name still appears in the output of the show buffer-profile [detail |
summary]
command. After a stack unit reset, the buer prole correctly returns to the default values, but the prole name remains.
Remove it from the show buffer-profile [detail | summary] command output by entering no buffer [fp-
uplink |csf] stack-unit port-set buffer-policy
from CONFIGURATION mode and no buffer-policy from
INTERFACE mode.
To display the allocations for any buer prole, use the show commands.
Debugging and Diagnostics
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