FS S3900 SERIES SWITCHES

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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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LACP Configuration on FS S3900 Series Switches

Posted on By FS.COM

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.

LACP Application on FS S3900 Series Switches

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 Switch LACP Application.png

Hardware Connection Guide for LACP of S3900 Series Switches

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.


FS S3900 Switch Hardware Connection Guide.png

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.

LACP Configuration Roadmap of S3900 Series Switches

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 Series Switch LACP Configuration Via CLI

Dynamic Configuration Commands

1.Add member interfaces to the channel-group. The configuration of S3900-48T4S is similar to that of S3900-24F4S and is not mentioned here.

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

2. Set the LACP system priority and determine the Actor so that the Partner selects active interfaces based on the Actor interface priority. ( Optional configuration)

S3900-24F4S (config)#interface port-channel 1
S3900-24F4S (config-if)#lacp system-priority 100

3. Set the upper threshold for the number of active interfaces to improve reliability. (Optional configuration)

S3900-24F4S (config)#interface port-channel 1
S3900-24F4S (config-if)#lacp max-member-count 8

4. Set LACP interface priorities and determine active interfaces so that interfaces with higher priorities are selected as active interfaces. (Optional configuration)

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

5. Create VLANs and add interfaces to the VLANs. (Optional configuration)

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

6. Verify the configuration. Check information about the channel-group on each switch and check whether link negotiation is successful.

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

Static Configuration Commands

1. Create a port-channel and configure it to work in LACP mode to implement link aggregation. The configuration of S3900-24F4S is similar to that of S3900-48T4S and is not mentioned here.

S3900-48T4S(config)#interface port-channel 1

2. Add member interfaces to the channel-group. The configuration of S3900-48T4S is similar to that of S3900-24F4S and is not mentioned here.

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

3. Create VLANs and add interfaces to the VLANs.

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

4. Verify the configuration. Check information about the channel-group on each switch and check whether link negotiation is successful.

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

S3900 Series Switch LACP Configuration Via Web Interface

Dynamic Configuration Commands (LACP)

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:

1. Switch Management > LACP > Group Member page is used to Apply the LACP group for designated ports.

LACP-1.png

2. Switch Management > LACP > Group LACP Configuration page is used to set system priority value to indicate a specific LAG during LACP negotiations with other systems. (Range: 0-65535; Default: 32768) (Note: This step is optional.)

Static Configuration Commands (Static Link Aggregation)

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:

1. Switch Management > Static Link Aggregation > Static Group page is used to create and delete static group.

2. Switch Management > Static Link Aggregation > Static Group Member page is used to add and delete static group member.

static link aggregation-2.png

Related Articles:

Traffic Segmentation Configuration on FS S3900 Series Switches
Stack Configuration on FS S3900 Series Switches

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