Queue Statistics on ESW2-350G Switches

Objective

Queue management is a discipline used in Quality of Service (QoS) internetwork architecture. A queue is a collection of packets, which are ready to be transmitted across the network. Queuing is used in network devices like routers and switches to handle congestion. Queue statistics provide the information about the number of packets forwarded and number of packets dropped on a particular interface.

This article explains how to add queue statistics for an interface on the ESW2-350G switches.

Applicable Devices

• ESW2-350G
• ESW2-350G-DC

Software Version

• 1.3.0.62

Add Queues Statistics

Step 1. Log in to the web configuration utility and choose Quality of Service > QoS Statistics > Queues Statistics. The Queues Statistics page opens:

The Queue Statistics page displays the following statistics aboutt the queue:

• Counter Set — Queue statistics for a particular counter set. Counter set contains all interfaces and queues with either high drop precedence or low drop precedence.

• Interface — Queue statistics for a particular interface. It is the name of the port with which the statistics in this entry are concerned.

• Queue — Packets are either forwarded or dropped from this queue.

• Drop Precedence — Queue statistics for a particular drop precedence value. Drop precedence helps decide which packets have to be discarded during congestion. Packets with higher drop precedence are dropped earlier than the packets with low drop precedence value.

• Total Packets — The total number of packets forwarded or dropped.

• Tail Drop Packets — The percentage of packets that are dropped.

Step 2. If you want to refresh the queue statistics periodically, click the appropriate refresh time radio button. Click the No Refresh radio button if you do not want to refresh the queue statistics.

Step 3. Click Add. A new window appears.

 Step 4. Click the particular counter set radio button from the Counter Set area.

• Set 1 — This set contains all the interfaces and queues with high drop precedence.

• Set 2 —This set contains all the interfaces and queues with low drop precedence.

Step 5. Click one of the following radio buttons in the Interface field to denote the interface for which you want to add queue statistics. 

• Port — Only one of the available ports can be added to the queue statistics table.  Choose the desired port from the Port drop-down list for which you want to add queue statistics.

• All Ports — Queue statistics on all the ports can be added.

Step 6. Click the desired radio button for which you want to add the statistics in the Queue field. The queue value ranges from 1 to 4. Click the All radio button if you want add statistics on all the queues. 

Step 7. Choose a particular drop precedence value from the Drop Precedence field and click the corresponding radio button. Drop precedence helps decide which packets have to be discarded during congestion. Packets with higher drop precedence are dropped earlier than the packets with low drop precedence value.

Step 8. Click Apply. The desired queue statistics are added. Click Close to return to the Queue Statistics page.

Step 9. (Optional) To delete an entry in the statistics table, check the appropriate entry check box and click Delete.

Step 10. (Optional) To clear queue statistics counters, click Clear Counters.