Administrator Guide

● 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
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. 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
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 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.
Dell#show buffer-profile detail interface gigabitethernet 0/1
Interface Gi 0/1
Buffer-profile -
Dynamic buffer 194.88 (Kilobytes)
Queue# Dedicated Buffer Buffer Packets
(Kilobytes)
0 2.50 256
1 2.50 256
2 2.50 256
3 2.50 256
4 9.38 256
5 9.38 256
6 9.38 256
7 9.38 256
Dell#show running-config interface tengigabitethernet 2/0 !
interface TenGigabitEthernet 2/0
no ip address
mtu 9252
Z-Series Debugging and Diagnostics
791