SNS switch troubleshooting

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Refer to Revelations of Troublesolving cases on the right.

Other related questions:
How to view the serial number of an S series switch
Serial numbers of S series switches fall into two categories: - Equipment serial number (ESN): indicates the serial number of a switch. The ESN of a modular switch is also called the chassis serial number. - Serial number (SN) of each component: indicates the serial number of a card, subcard, optical module, power supply, or fan module. Select one of the following methods to obtain the ESN or SN of a switch or component: Method 1: View SN labels. Equipment or chassis SN: View the SN label attached to the device panel. (There is a slight difference between label locations on different models. For example, the label can locate on the front, rear, or top of the chassis.) Card serial number: View the SN label on the panel (upper-right or upper-left corner) or PCB (remove and check the card). Method 2: Run a command. Run the display elabel command to view the electronic label of each component. The BarCode field indicates the serial number. Method 3: Through the web system. When the web system is enabled on a device, view the chassis serial number through the web system. EasyOperation web system (supported only in V200R005 and later versions) Log in to a device through the web system and click Monitor on the toolbar to enter the Monitor page. You can view device information, including the chassis serial number. Web system classical version Log in to a device through the web system and click Device Summary on the toolbar to view device information, including the chassis serial number. Click the following links for details about how to query the ESN or SN of a switch or component: - For the S12700, see "Information Collection > Obtaining the Equipment Serial Number" in S12700 Troubleshooting - Preliminary . - For the S7700 and S9700, see "Information Collection > Obtaining the Equipment Serial Number" in S7700&S9700 Troubleshooting - Preliminary . - For the S1720, S2700, S3700, S5700, and S6700, see "Information Collection > Obtaining the Equipment Serial Number" in S1720&S2700&S3700&S5700&S6700 Troubleshooting - Preliminary . - For the S9300, see "Information Collection > Obtaining the Equipment Serial Number" in S9300 Troubleshooting - Preliminary . - For the S600-E, see "Information Collection > Obtaining the Equipment Serial Number" in S600-E Troubleshooting - Preliminary .

How can I check whether a loop exists on an S series switch
The simplest way to check the existence of a loop on an S series switch (except the S1700) is to check whether a MAC address flapping alarm exists on the switch. If the alarm exists, you can quickly locate the loop based on the information in the alarm. Run the display mac-address flapping record command to check whether MAC address flapping exists, or run the display trapbuffer command to check whether the alarm contains The mac-address has flap value or MAC move detected. For more information, visit Layer 2 Loop Troubleshooting.

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