Dell S4048T, Configuration Manual

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• 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
Examples of Viewing Buffer Information
Dell Networking OS Behavior
: If you attempt to apply a buffer profile to a non-existent port-pipe, Dell
Networking OS 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
configuration still appears in the running-config.
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 allocation 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 1, port pipe 0, egress port 25 due to unavailability of cells
.
Dell Networking OS 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
no buffer [fp-uplink |csf] linecard port-
set buffer-policy
from CONFIGURATION mode and
no buffer-policy
from INTERFACE mode.
To display the allocations for any buffer profile, use the
show
commands.
Debugging and Diagnostics 1249