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Networking / Network Switch / Stack Configuration on FS S3900 Series Switches

Stack Configuration on FS S3900 Series Switches

Posted on By FS.COM

Switch stacking technology is a network solution that enables network switches to be connected together as a single unit with the same IP address. Set up as a single entity, stackable switches have not only optimized scalability and flexibility but also simplified network configuration and administration. FS S3900 series stackable switches, which are designed for the campus network, SMB, and home network, have the ability to stack as well.

Stack Application on FS S3900 Series Switches

Here stacking two S3900-24T4S switches is taken as an example. As shown in the topologic graph below, Switch-A and Switch-B are stacked in one group. Two S3900-24T4S switches are stacked together as one unit, which enables users to expand their network capacity without the hassle of managing multiple devices. What's more, it is feasible to add up to six S3900-24T4S switches as needed without affecting the overall performance of the switch stack.

In this example, S3900-24T4S-A is the stack master and S3900-24T4S-B is the slave. Electing the stack master of S3900 series switches follows the principles:


  • After successful configuration, the switch to reboot first is elected as the master by default.

  • In the case of running simultaneously, the switch with the highest stack member priority value will become the master. The highest priority value can be assigned to the switch using command.

  • If the switches in a stack have the same boot time as well as priority value, the master will be the switch with the lowest MAC address.


Stack Application.jpg

Hardware Connection Guide for Stack of FS S3900 Series Switches

S3900 series stackable switches are all embedded with four 10G SFP+ ports, only the two of which in the far right are assigned for stacking. All of the S3900 series switches are able to connect through a combination of 10G SFP+ transceiver and fiber patch cables or via 10G SFP+ DAC or AOC cables. The detailed connections of different stack members from two to six are shown in the figure below.

Stack Connection.jpg

Notes:


  • S3900 series switches support switch stacking up to six units of the same model.

  • The stacking ports are always the two 10G SFP+ ports with the maximum number of S3900 series switches, port 27 & 28 for S3900-24T4S and S3900-24F4S switches stack configuration and port 51 & 52 for S3900-48T4S switches. The ports will no longer be the service port or be configured after being applied for stacking.

  • If communication between switches is interrupted after a stack is set up, the stack will split into standalone switches, which is called stacking split. In the process of splitting, there will be a failure in data flow, the duration of which is about one second. However, the overall transmission will not be affected.

Stack Configuration Roadmap of FS S3900 Series Switches

The following stack configuration will take two S3900-24T4S switches as an example. Stacking 3/4/5/6 S3900 series switches follows the same configuration steps and commands as stacking two switches.

The configuration roadmap is here:


  • Enable the stacking function of the two S3900 switches.

  • After the stack is set up, observe indicators and save the configuration, then reboot the two switches.

  • Check the status of the master switch.

  • Check the interface information, the master switch will show all the interface and the four ports for stacking will not show in the port list.

FS S3900 Series Switch Stack Configuration via CLI

1. Turn on the stacking function of two S3900-24T4S switches.

S3900-24T4S-A(config)#stacking enable 1
S3900-24T4S-B(config)#stacking enable 1

2. Save configuration and then restart the two switches.

S3900-24T4S-A#copy running-config startup-config

S3900-24T4S-A#restart
S3900-24T4S-B#copy running-config startup-config
S3900-24T4S-B#restart

3. Check the status of the master switch. S3900-24T4S-A is the master switch and S3900-24T4S-B is the slave switch. Users cannot log in to the slave switch when the master switch is in management.

Switch#show stacking status
stack results 1.png

4. Check the interface information, the switch will show all the interface, the four ports for stacking will not show in the port list.

Switch#show interfaces brief
stack results 2.png

6. Configure the eth1/21 port and eth 2/21 port as access on the master switch and allow VLAN 10 pass.

Switch(config)#interface ethernet 1/21
Switch(config-if)#switchport mode access
Switch(config-if)#switchport access vlan 10
Switch(config)#interface ethernet 2/21
Switch(config-if)#switchport mode access
Switch(config-if)#switchport access vlan 10

7. Configure IP address 10.100.10.4 and mask 255.255.255.0 for the PC.

8. Connect PC with the eth1/21 of master, and ping VLAN 10 IP address on PC.

C:Userss>ping 10.10.10.3
Pinging 10.10.10.3 with 32 bytes of data:
Reply from 10.10.10.3: bytes=32 time=4ms TTL=249
Reply from 10.10.10.3: bytes=32 time=56ms TTL=249
Reply from 10.10.10.3: bytes=32 time=6ms TTL=249
Reply from 10.10.10.3: bytes=32 time=14ms TTL=249
Ping statistics for 10.10.10.3:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 4ms, Maximum = 56ms, Average = 20ms

9. Connect PC with eth2/21 of master, ping VLAN 10 IP address on PC.

C:Userss>ping 10.10.10.3
Pinging 10.10.10.3 with 32 bytes of data:
Reply from 10.10.10.3: bytes=32 time=13ms TTL=249
Reply from 10.10.10.3: bytes=32 time=3ms TTL=249
Reply from 10.10.10.3: bytes=32 time=4ms TTL=249
Reply from 10.10.10.3: bytes=32 time=10ms TTL=249
Ping statistics for 10.10.10.3:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 3ms, Maximum = 13ms, Average = 7ms

10. PC can successfully ping master switch and slave switch, suggesting switch stacking is accomplished.

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