The S3900 series switches consist of three models: S3900-24T4S, S3900-24F4S, S3900-48T4S, which are fully managed stackable Gigabit switches, equipped with Broadcom chips, supporting 10G SFP+ uplinks, designed for SMB, campus and enterprise networks.
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In networking, the LACP (link aggregation control protocol) technology is used to increase the bandwidth of a single connection and provide redundancy in case one of the links fails. FS S3900 series switches, designed for the campus network, SMB, and home network, also support LACP.
Take LACP application between S3900 series switches and S5800-8TF12S as an example. The combining two links enable a load-balancing mode between S3900-48T4S and S5800-8TF12S switches to provide the network reliability. By applying LACP, the two 10G network links are physically bundled together to form a single 20G data path with its logical bandwidth increased. When one link fails, the LACP will lead the data packet to be transferred in the remaining link.
FS S3900 series switches consist of S3900-24T4S, S3900-24F4S, and S3900-48T4S. Typically, the three switches can support three types of connection to do LACP: copper-to-copper, 1G-1G, and 10G-to-10G. In the following figure, the detailed connections of these three ways are shown.
Note:
Theoretically, any LACP link group can be formed by links with different transmission media and data rate. But when links with different data rates have to be connected as one aggregation group, please remember to manually limit the higher data rate to the lowest one.
FS S3900-series switches allow for the maximum of 26 aggregation link groups between two switches. As for a single LACP connection group, the S3900-48T4S switch type enables a maximum of 52 ports to be bundled together; while the S3900-24T4S and S3900-24F4S can accommodate no more than 28 ports together. Notably, every LACP link group of S3900 series switches can only have 8 active ports to work at the same time, while the remaining ports can only do back-up. Only if the active port fails down, can the back-up port join the active group to work.
If you need to do LACP for S3900-series switches with other devices, please make sure the other devices also support LACP, otherwise the LACP link can not be set up.
The LACP configuration can achieve two types of link aggregation groups (LAGs): dynamic LAGs and static LAGs. The former negotiate settings between the two connected devices, which is suggested to be used between FS S3900 series switches. The static one, also known as manual, is suggested to be applied between S3900 series switches and switches of a different brand or other types of devices like routers.
The following will demonstrate the detailed configuration process of LACP links between S3900-24F4S and S3900-48T4S. The configuration of dynamic and static LACP on S3900 series switches can be achieved via both CLI and web interface methods. And the configuration roadmaps are all the same as the following:
Add member interfaces to the channel-group.
Set the LACP system priority and determine the Actor so that the Partner selects active interfaces based on the Actor interface priority.
Set the upper threshold for the number of active interfaces to improve reliability. (This step is only optionally applied in CLI dynamic configuration commands.)
Set LACP interface priorities and determine active interfaces so that interfaces with higher priorities are selected as active interfaces. (This step is only optionally applied in CLI dynamic configuration commands.)
Create VLANs and add interfaces to the VLANs. (This step is only optionally applied in CLI dynamic configuration commands.)
Verify LACP configuration.
S3900-24F4S#configure terminal
S3900-24F4S (config)#interface ethernet 1/21
S3900-24F4S (config-if)#channel-group 1 mode auto
S3900-24F4S(config-if)#exit
S3900-24F4S (config)#interface ethernet 1/22
S3900-24F4S (config-if)#channel-group 1 mode auto
S3900-24F4S (config-if)#exit
S3900-24F4S (config)#interface ethernet 1/23
S3900-24F4S (config-if)#channel-group 1 mode auto
S3900-24F4S (config-if)#exit
S3900-24F4S (config)#interface port-channel 1
S3900-24F4S (config-if)#lacp system-priority 100
S3900-24F4S (config)#interface port-channel 1
S3900-24F4S (config-if)#lacp max-member-count 8
S3900-24F4S (config)#interface ethernet 1/21
S3900-24F4S (config-if)#lacp port-priority 100
S3900-24F4S(config-if)#exit
S3900-24F4S(config)#interface ethernet 1/22
S3900-24F4S (config-if)#lacp port-priority 100
S3900-24F4S (config)#vlan database
S3900-24F4S (config-vlan)#vlan 10
S3900-24F4S (config-vlan)#exit
S3900-24F4S (config)#interface port-channel 1
S3900-24F4S (config-if)#switchport mode trunk
S3900-24F4S (config-if)#switchport trunk allowed vlan add 10
S3900-24F4S#show interfaces status port-channel 1
Group Type: LACP
Port Type: 1000BASE SFP
Link Status: Up
Speed-duplex Status: 1000full
Max Frame Size: 1518 bytes (1522 bytes for tagged frames)
MAC Learning Status: Enabled
Member Ports: Eth1/21, Eth1/22, Eth1/23
Active Member Ports: Eth1/21, Eth1/22,Eth1/23
S3900-48T4S#show interfaces status port-channel 1
Group Type: LACP
Port Type: 1000BASE SFP
Link Status: Up
Speed-duplex Status: 1000full
Max Frame Size: 1518 bytes (1522 bytes for tagged frames)
MAC Learning Status: Enabled
Member Ports: Eth1/21, Eth1/22, Eth1/23
Active Member Ports: Eth1/21, Eth1/22, Eth1/23
S3900-24F4S#show lacp
Port Channel: 1
Max Member Count: 8
Timeout: Long
State: Active
------------------------------------------------------------
Member Port: Eth 1/21
System Priority: 100
Port Priority: 100
------------------------------------------------------------
Member Port: Eth 1/22
System Priority: 100
Port Priority: 100
------------------------------------------------------------
Member Port: Eth 1/23
System Priority: 100
Port Priority: 32768
S3900-48T4S#show lacp
Port Channel: 1
Max Member Count: 8
Timeout: Long
State: Active
------------------------------------------------------------
Member Port: Eth 1/21
System Priority: 32768
Port Priority: 32768
------------------------------------------------------------
Member Port: Eth 1/22
System Priority: 32768
Port Priority: 32768
------------------------------------------------------------
Member Port: Eth 1/23
System Priority: 32768
Port Priority: 32768
S3900-48T4S(config)#interface port-channel 1
S3900-48T4S #configure terminal
S3900-48T4S (config)#interface ethernet 1/21
S3900-48T4S (config-if)#channel-group 1 mode on
S3900-48T4S (config-if)#exit
S3900-48T4S (config)#interface ethernet 1/22
S3900-48T4S (config-if)#channel-group 1 mode on
S3900-48T4S (config-if)#exit
S3900-48T4S (config)#vlan database
S3900-48T4S (config-vlan)#vlan 10
S3900-48T4S (config-vlan)#exit
S3900-48T4S (config)#interface port-channel 1
S3900-48T4S (config-if)#switchport mode trunk
S3900-48T4S (config-if)#switchport trunk allowed vlan add 10
S3900-48T4S #show interfaces status port-channel 1
Group Type: Static
Port Type: 1000BASE-T
Link Status: Up
Speed-duplex Status: 1000full
Max Frame Size: 1518 bytes (1522 bytes for tagged frames)
MAC Learning Status: Enabled
Member Ports: Eth1/21, Eth1/22
Active Member Ports: Eth1/21, Eth1/22
Log into FS switch web management interface to configure LACP. The configuration of S3900-24F4S is similar to that of S3900-48T4S, and is not mentioned here. The detailed steps are listed as below:
Log into FS switch S3900 web management interface to configure static link aggregation. The configuration of S3900-24F4S is similar to that of S3900-48T4S, and is not mentioned here. The detailed steps are listed as below:
Traffic Segmentation Configuration on FS S3900 Series Switches
Stack Configuration on FS S3900 Series Switches
Can a port group be a downlink port if the group is a trunk? By Chavers on May 1, 2022
Yes, if the port group is trunk type, it can also be used as a downlink port. By FS on May 2, 2022
How loud is it? I plan to use it in a homelab office and need to know if I will be able to sit next to it all day. Thanks By Harlan on March 14, 2022
It is fanless, so it's suitable for deployment in work areas or home scenes. By FS on March 15, 2022
Does this switch requires liscensing like the cisco types? By Aaron Laymon on March 14, 2022
It does not require a license, all the features listed are available directly on the switch. By FS on March 14, 2022
What are the dimensions? By Kilby on March 10, 2022
Physical dimensions 44 x 440 x 280mm(1.73'' x 17.32'' x 11.02''), this fits a standard19"rack slot with a minimum of 1U height. By FS on March 11, 2022
Does this switch come with rack mount ears and screws? By Herbert on March 9, 2022
Mine come with the ears and screws for the ears. By FS on March 11, 2022
Does the 10G Uplink port of this switch support the electrical interface module of FS? What happens to the rate? By Colby on January 1, 2022
The 10G port of S3900-24T4S switch can use FS electrical interface module, which has no impact on the rate. It only says that the electrical interface module is used with network cables, and the optical module is used with fiber optic cables. By FS on January 1, 2022
Does the switch support other operating systems besides FSOS? By Keith Carter on December 30, 2021
S3900-24T4S is a hardware and software integrated switch. It cannot be installed and adapted to other operating systems. By FS on December 30, 2021
Could you provide inter-VLAN routing and relevant documents? By Bruck on December 25, 2021
Hello, S3900-24T4S supports inter VLAN routing, You can refer to section 3.1 of this document: S3900 Series Switches Configuration Guide . By FS on December 25, 2021
Can the S3900-24T4S switch connect two routers and then segment the network? By Jacob on December 21, 2021
S3900-24T4S supports VLAN, L3 Static Routing, and QoS, which can meet your requirements for network segmentation. By FS on December 21, 2021
DHCP Server can be configured on S3900-24T4S switches, correct? By Goulet on December 17, 2021
I'm sorry you can't, it doesn't support DHCP Server. By FS on December 17, 2021