|Intelligent Stack (iStack) allows multiple stacking-capable switches to function as a single logical switch.|
|Before a stack is set up, each switch is an independent entity and has its own IP address and MAC address. You need to manage the switches separately. After a stack is set up, the switches in the stack form a logical entity. You can use a single IP address to manage and maintain all the switches in the stack. A stack can transmit a large amount of data, improve network reliability, and simplify network management.|
|Switches in a stack can form a ring or chain topology, as shown in Figure 1 and Figure 2.|
| Figure 1 Ring topology |
| Figure 2 Chain topology |
|A stacking failure refers to one of the following situations:|
This fault is commonly caused by one of the following:
Saving the results of each troubleshooting step is recommended. If troubleshooting fails to correct the fault, you will have a record of your actions to provide Huawei technical support personnel.
Before replacing a switch, inserting a stack card or stack cable, or replacing a stack card, power off the switch.
|Perform the following steps on each switch where a stacking failure occurs.|
|1.Check that the stacking function is enabled on the switch.|
|Run the display stack command to check the stack status.|
In a stack set up using stack cards, check that the stack cards are properly installed before running the display stack.
|a.Check whether the stack card and stack cables are installed properly. If the stack card or a stack cable is loose, reconnect it. The switches can form a stack in a ring or chain topology. The ring topology is recommended because it is more stable and reliable.|
b.Run the stack enable command in the system view to enable the stacking function, and then restart the switch.
|2.Check the device model. The S5710LI, S5700EI or S5700SI switches cannot be added to the same stack system.|
|Run the display elabel command to view the electronic label. The Description field in the command output indicates the device model.|
|<HUAWEI_TEST> display elabel |
/$[System Integration Version]
/$[Board Integration Version]
Description=Quidway S5700-48TP-PWR-SI,LS5ZC48CM,S5700-48TP-PWR-SI Mainframe
|3.Check that the correct electronic label has been loaded to the switch.|
|Run the display elabel command to view the electronic label.|
|4.Check the electronic label of the stack card.|
Perform this step only on switches that set up a stack using stack cards.
Run the display elabel slot slot-number sub-card-number command to check the electronic label of the stack card.
|In the command, slot slot-number specifies the stack ID, which can be obtained from the display stack command output. The sub-card-number value is always 2 for a stack card. For example, to view the stack card electronic label on a switch with stack ID 0, run the display elabel slot 0 2 command.|
|5.Check that stack cables are correctly connected.|
Perform this step only on switches that set up a stack using service interfaces.
|If the switch uses service interfaces and stack interfaces, check the configuration of the stack interfaces.|
|Run the display stack port [ configuration ] [ slot slot-id ] command to check the configuration of stack interfaces.|
|Compare the displayed interfaces with the actual connected interfaces on the switches.|
<HUAWEI_TEST> display stack port
|6.Check that the stack card and stack cables are functioning properly.|
|If the fault persists, go to the next step.|
|7.Collect the following information and contact Huawei technical support personnel.|