Medianet Reference Guide - Cisco

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Cisco Network Analysis Module Chapter 6 Medianet Management and Visibility Design Considerations Example 6-22 Output from Cisco Catalyst 3750G/3750E show platform port-asic stats drop Command me-eastny-3#show platform port-asic stats drop fast 1/0/1 Interface Fa1/0/1 TxQueue Drop Statistics Queue 0 Weight 0 Frames 0 Weight 1 Frames 0 Weight 2 Frames 0 Queue 1 Weight 0 Frames 0 Weight 1 Frames 0 Weight 2 Frames 0 Queue 2 Weight 0 Frames 0 Weight 1 Frames 0 Weight 2 Frames 0 Queue 3 Weight 0 Frames 0 Weight 1 Frames 0 Weight 2 Frames 0 To make use of information regarding transmit queues drops shown in Example 6-22, you must understand which traffic classes are assigned to which transmit queues and which drop thresholds within those queues. For Cisco Catalyst 3750G or 3750E Series switches, the show mls qos maps dscp-output-q command can be used to display which DSCP values are mapped to which transmit queues and drop thresholds on the switch, as shown in Example 6-23. Example 6-23 Output from Cisco Catalyst 3750G or 3750E Series show mls qos maps dscp-output-q Command me-eastny-3#show mls qos maps dscp-output-q Dscp-outputq-threshold map: d1 :d2 0 1 2 3 4 5 6 7 8 9 ------------------------------------------------------------------------------------------ 0 : 03-03 02-01 02-01 02-01 02-01 02-01 02-01 02-01 04-01 02-01 1 : 04-02 02-01 04-02 02-01 04-02 02-01 02-01 03-01 02-01 03-01 2 : 02-01 03-01 02-01 03-01 02-03 03-01 02-02 03-01 02-02 03-01 3 : 02-02 03-01 01-03 04-01 02-02 04-01 02-02 04-01 02-02 04-01 4 : 01-01 01-01 01-01 01-01 01-01 01-01 01-03 01-01 02-03 04-01 5 : 04-01 04-01 04-01 04-01 04-01 04-01 02-03 04-01 04-01 04-01 6 : 04-01 04-01 04-01 04-01 The vertical column, marked d1, represents the first decimal number of the DSCP value, while the horizontal column, marked d2, represents the second decimal number of the DSCP value. For example, a d1 value of 3 and a d2 value of 2 yields a DSCP decimal value of 32, which corresponds to the CS4 service class. This is mapped to queue 1, drop threshold 3 in Example 6-23 (highlighted in bold). Again, you still need to separately understand the mapping of specific video applications to service classes that are then marked with a particular DSCP value. However, combined with the knowledge of which traffic classes and are mapped to which transmit queue and drop threshold, you can use this information to troubleshoot video application performance issues across the Cisco Catalyst 3750G/3750E Series platforms. To see the particular values of the buffer allocation and drop thresholds, you can issue the show mls qos queue-set command. An example of the output is shown in Example 6-24. 6-58 Medianet Reference Guide OL-22201-01
Chapter 6 Medianet Management and Visibility Design Considerations Cisco Network Analysis Module Example 6-24 Example Output From Cisco Catalyst 3750G or 3750E Switch Stack show mls qoe queue-set Command me-eastny-3#show mls qos queue-set Queueset: 1 Queue : 1 2 3 4 ----------------------------------------------------------- buffers : 30 30 35 5 threshold1 : 100 70 100 40 threshold2 : 100 80 100 100 reserved : 50 100 50 100 maximum : 400 100 400 100 Queueset: 2 Queue : 1 2 3 4 ----------------------------------------------------------- buffers : 25 25 25 25 threshold1 : 100 200 100 100 threshold2 : 100 200 100 100 reserved : 50 50 50 50 maximum : 400 400 400 400 In Example 6-24, buffers are allocated according to weight ratios across the four egress queues. Threshold1 and threshold2 correspond to the two configurable thresholds per queue, with the third non-configurable threshold being at 100 percent queue depth. The Cisco Catalyst 3750G and 3750E Series switches dynamically share buffer space across an ASIC that may support more than one physical interface. The reserved and maximum settings are used to control the minimum reserved buffer percentage size guaranteed per queue per port, and the maximum buffer percentage size a particular port and queue can dynamically allocate when it needs additional capacity. The combination of drop statistics per queue, mapping of DSCP value to output queue, and the buffer allocations per queue-set, can be used to determine whether sufficient bandwidth has been allocated per service class (and per application if individual video applications are mapped to separate service classes corresponding to different DSCP values) on the Cisco Catalyst 3750G/3750E Series platforms. When configured in a switch stack, statistics such as those found within the show platform port-asic stats drop command are not directly accessible on member switches from the master switch. To determine which switch is the master switch, and which switch you are currently logged into within the switch stack, you can run the show switch command. An example of this output is shown in Example 6-25. Example 6-25 Sample Output From Cisco Catalyst 3750G or 3750E Switch Stack show switch Command me-eastny-3#show switch Switch/Stack Mac Address : 0015.2b6c.1680 H/W Current Switch# Role Mac Address Priority Version State -------------------------------------------------------------------------------- *1 Master 0015.2b6c.1680 15 0 Ready 2 Member 001c.b0ae.bf00 1 0 Ready The output from Example 6-25 shows that Switch 1 is the Master switch, and the asterisk next to Switch 1 indicates that the output was taken from a session off this switch. To access the statistics from the show platform port-asic stats drop command on member switches of the stack, you must first establish a session to the member switch via the session command. This is shown in Example 6-26. Example 6-26 Example Output From Member Cisco Catalyst 3750G or 3750E Switch me-eastny-3#session 2 OL-22201-01 Medianet Reference Guide 6-59
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About the Authors Solution Authors
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Contents Application Intelligence a
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Contents The Globalization of the W
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Contents NetFlow Collector Consider
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