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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A VLAN(virtual LAN) is any broadcast domain that is partitioned and isolated in a computer network at the data link layer which groups devices from different physical LANs into a single logical network, improving simplicity, security, traffic management, or economy.
There are four types of VLAN configuration, which consists of interface-based VLAN, MAC address-based VLAN, IP subnet-based VLAN, protocol-based VLAN, and policy-based VLAN. Among these configurations, assigning VLAN based on IP subnets applies to scenarios where there is a high requirement for mobility and simplified management but a low requirement for security. This article will guide you to learn about the IP subnet-based VLAN feature of FS S3900 series L2+ switches.
A data center has multiple services, which use varying IP subnets. Different services need to be allocated to different VLANs and distributed to different remote networks based on VLAN IDs. For example, the diagram below shows a FS S3900-24T4S switch with three ports configured to handle the traffic for three VLANs. Through IP subnet-based VLAN Configuration, the three different IP addresses are separately assigned to VLAN 10, VLAN 20 and VLAN 30 so that interface ethernet 1/0/5-1/0/7 of the switch can transmit packets with different VLAN IDs to devices which are received from the router.
In this example, IP subnet-based VLAN assignment reduces traffic and thereby speeds up the network. What’s more, generally, each subnet corresponds with a VLAN. The port configured with IP subnet-based VLAN will assign the packet to a VLAN based on its source address of the packet even if the port changes, which shows the flexibility of IP subnet-based VLAN feature.
In the following example, FS S3900-24T4S switch is configured for an IP subnet-based VLAN. PC-1, PC-2, and PC-3 respectively belongs to different IP subnets. The interface ethernet 1/1-3 on the switch are configured as hybrid ports. Untagged packets for VLAN 10, VLAN 20, and VLAN 30 are transmitted and received on these ports.
Note:
The IP subnet-based VLAN Configurations are only applicable on hybrid ports.
The IP subnet-based VLAN Configurations are only applied to untagged packets.
To configure IP subnet-based VLAN on FS S3900 series switches, these guidelines should be followed:
Create VLANs on the switch and configure IP address.
Configure hybrid interfaces and assign them to corresponding VLANs in an untagged mode.
Configure pinging gateway test on the three PCs respectively.
Check the VLAN interface on the switch to see if the PC can ping the gateway IP address.
S3900-24T4S#configure terminal
S3900-24T4S(config)#subnet-vlan subnet 10.1.1.0 255.255.255.0 vlan 10
S3900-24T4S(config)#subnet-vlan subnet 10.1.2.0 255.255.255.0 vlan 20
S3900-24T4S(config)#subnet-vlan subnet 10.1.3.0 255.255.255.0 vlan 30
S3900-24T4S(config)#exit
S3900-24T4S#show subnet-vlan
S3900-24T4S#configure terminal
S3900-24T4S(config)#vlan database
S3900-24T4S(config-vlan)#vlan 10
S3900-24T4S(config-vlan)#vlan 20
S3900-24T4S(config-vlan)#vlan 30
S3900-24T4S(config-if)#exit
S3900-24T4S(config)#interface vlan 10
S3900-24T4S(config-if)#ip add 10.1.1.1/24
S3900-24T4S(config-if)#exit
S3900-24T4S(config)#int vlan 20
S3900-24T4S(config-if)#ip add 10.1.2.1/24
S3900-24T4S(config-if)#exit
S3900-24T4S(config)#interface vlan 30
S3900-24T4S(config-if)#ip add 10.1.3.1/24
S3900-24T4S(config-if)#exit
S3900-48T4S(config)#interface ethernet 1/1
S3900-48T4S(config-if)#switchport mode hybrid
S3900-48T4S(config-if)#switchport hybrid allowed vlan add 10 untagged
S3900-48T4S(config-if)#switchport hybrid allowed vlan add 20 untagged
S3900-48T4S(config-if)#switchport hybrid allowed vlan add 30 untagged
S3900-24T4S(config-if)#exit
S3900-48T4S(config)#int ethernet 1/2
S3900-48T4S(config-if)#switchport mode hybrid
S3900-48T4S(config-if)#switchport hybrid allowed vlan add 30 untagged
S3900-48T4S(config-if)#switchport hybrid allowed vlan add 20 untagged
S3900-48T4S(config-if)#switchport hybrid allowed vlan add 10 untagged
S3900-24T4S(config-if)#exit
S3900-48T4S(config)#int ethernet 1/3
S3900-48T4S(config-if)#switchport mode hybrid
S3900-48T4S(config-if)#switchport hybrid allowed vlan add 10 untagged
S3900-48T4S(config-if)#switchport hybrid allowed vlan add 20 untagged
S3900-48T4S(config-if)#switchport hybrid allowed vlan add 30 untagged
S3900-24T4S(config-if)#exit
C:UsersDell>ping 10.1.1.1
Pinging 10.1.1.1 with 32 bytes of data:
Reply from 10.1.1.1: bytes=32 timeReply from 10.1.1.1: bytes=32 timeReply from 10.1.1.1: bytes=32 timeReply from 10.1.1.1: bytes=32 timePing statistics for 10.1.1.1:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 0ms, Average = 0ms
C:UsersDell>ping 10.1.2.1
Pinging 10.1.2.1 with 32 bytes of data:
Reply from 10.1.2.1: bytes=32 timeReply from 10.1.2.1: bytes=32 timeReply from 10.1.2.1: bytes=32 timeReply from 10.1.2.1: bytes=32 timePing statistics for 10.1.2.1:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 0ms, Average = 0ms
C:UsersDell>ping 10.1.3.1
Pinging 10.1.3.1 with 32 bytes of data:
Reply from 10.1.3.1: bytes=32 timeReply from 10.1.3.1: bytes=32 timeReply from 10.1.3.1: bytes=32 timeReply from 10.1.3.1: bytes=32 timePing statistics for 10.1.3.1:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 0ms, Average = 0ms
S3900-24T4S#show vlan all
VLAN ID : 1
Name : DefaultVlan
Type : Static
Members :
Eth1/ 1(S) Eth1/ 2(S)Eth1/ 3(S) Eth1/ 4(S) Eth1/ 5(S)
Eth1/ 6(S) Eth1/ 7(S) Eth1/ 8(S) Eth1/ 9(S) Eth1/10(S)
Eth1/11(S)Eth1/12(S)Eth1/13(S) Eth1/14(S) Eth1/15(S)
Eth1/16(S) Eth1/17(S) Eth1/18(S) Eth1/19(S) Eth1/20(S)
Eth1/21(S) Eth1/22(S) Eth1/23(S) Eth1/24(S) Eth1/25(S)
Eth1/26(S) Eth1/27(S) Eth1/28(S) Eth1/29(S) Eth1/30(S)
Eth1/31(S) Eth1/32(S) Eth1/33(S) Eth1/34(S) Eth1/35(S)
Eth1/36(S) Eth1/37(S) Eth1/38(S) Eth1/39(S) Eth1/40(S)
Eth1/41(S) Eth1/42(S) Eth1/43(S) Eth1/44(S) Eth1/45(S)
Eth1/46(S) Eth1/47(S) Eth1/48(S) Eth1/49(S) Eth1/50(S)
Eth1/51(S) Eth1/52(S)
VLAN ID : 10
Name :
Type : Static
Members : Eth1/ 1(S) Eth1/ 2(S) Eth1/ 3(S)
VLAN ID : 20
Name :
Type : Static
Members : Eth1/ 1(S) Eth1/ 2(S) Eth1/ 3(S)
VLAN ID : 30
Name :
Type : Static
Members : Eth1/ 1(S) Eth1/ 2(S) Eth1/ 3(S)
Interface-based VLAN Configuration on FS S3900 Series Switches
Voice VLAN 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