Белая книга для Cisco Cisco Nexus 5010 Switch

 

 

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The Buffer Utilization Histogram default sampling time is one second. When the administrator is familiar with traffic 

patterns, and without or with minimal numbers of traffic microbursts, this sampling period can provide a 

comprehensive view of usage buffer resources and provide information on how buffer was used in the past. Where 

a network administrator is not familiar with the network or traffic patterns, or where traffic microbursts are common, 

the recommended sampling period is 250 milliseconds, or fast sampling mode. This mode gives results with higher 

granularity, and can offer a better idea of how traffic microbursts or newly connected devices affect buffer. To 

enable fast sampling on the device, execute the following command in global configuration mode: 

switch(config)# hardware profile buffer monitor sampling fast 

The buffer usage histogram will be saved after changing the sampling mode. Once the network is stable and free 

of unexpected traffic behavior, the sampling period can be restored to the default sampling period of one second. 

To return the default sampling period to one second execute the following command: 

switch(config)# no hardware profile buffer monitor sampling fast 

When attaching a new device to the interface, and lower load to buffer is expected, the statistic can be erased. The 

commands below can erase the statistic on a particular interface or on all interfaces in which Buffer Utilization 

Histogram is enabled: 

switch# clear hardware profile buffer monitor interface ethernet 1/21 

switch# clear hardware profile buffer monitor 

On Cisco Nexus 5600 and Nexus 6000 Series Switches the instantaneous mode is enabled by default and cannot 

be disabled. The instantaneous mode shows the buffer utilization at the moment of executing the command. To 

see how much buffer is utilized in a given moment, execute the following command: 

switch# show hardware profile buffer monitor interface ethernet 1/1 

+---------------------------------------------------------------------------+ 

|    Instant Ingress Buffer utilization per class per port. Every line      | 

|   displays the number of cells utilized for a given port for each class   | 

|                  One cell represents 320 bytes                            | 

+---------------------------------------------------------------------------+ 

----------------------------------------------------------------------------- 

                        Interface :        Eth1/1 

----------------------------------------------------------------------------- 

              Total Port Instant Usage             1 (0.000320MB) 

              Remaining Asic Instant Usage     48836 (15.627520MB) 

              Per asic ingress cell count      48840 (15.628800MB) 

+----------+-------+-------+--------+-------+-------+-------+-------+-------+ 

       port| class0| class1|  class2| class3| class4| class5| class6| class7| 

+----------+-------+-------+--------+-------+-------+-------+-------+-------+ 

     Eth1/1|      0|      0|       0|      1|      0|      0|      0|      0| 

+----------+-------+-------+--------+-------+-------+-------+-------+-------+ 

+---------------------------------------------------------------------------+ 

|    Instant Egress Buffer utilization per unicast/multicast pool per port  | 

|              Each line displays the number of cells utilized.             | 

|                        One cell represents 320 bytes                      | 

+---------------------------------------------------------------------------+