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, DHCP Snooping is a security feature of the network switch to prevent unauthorized DHCP servers sending IP addresses to DHCP clients, or prohibit unrecognized devices sending port-related information to a DHCP server. S3900 series Layer 2+ Gigabit managed switches can give full play to this function especially when it serves in the access layer.
DHCP Snooping, the layer 2 security technology, is often deployed at the access layer. Here takes S3900-24F4S switch, servers and the PC as an example to illustrate the DHCP Snooping application. When PC asks for the IP address, assuming that both authorized and rogue DHCP servers will react, the message from which one would be accepted by the PC? Theoretically, the one that runs faster wins. Well, with the DHCP Snooping enabled on the switch, only the message from the authorized DHCP server will be sent to the destination through the trusted ports. However, if the PC connects to the switch through any port other than the one that has been recorded in the binding table of the DHCP Snooping, or if the PC is replaced by another end-device, resulting in the variation of the MAC address, the message from the DHCP server will fail to be sent to the client, as only the packets matched to the IP-MAC-Port Binding rules can be processed.
Note:
The switch executing the DHCP Snooping will generally link upwards to the DHCP server and downwards to clients. As most end devices are only equipped with RJ45 ports, the downward pathway may need to be carried by the Ethernet copper cable.
The configuration of DHCP Snooping on S3900 series switches can be achieved via CLI. The configuration roadmaps are as follows:
Create a VLAN and enable DHCP Snooping on the VLAN;
Add the ports connected to the DHCP server and the legal clients into the VLAN;
Configure the ports connected to the DHCP server as the trusted interfaces to allow for the pass-through of the port-related information;
Verify the configuration.
Taking FS S3900-24F4S switch as an example, the specific commands are shown and explained as follows:
S3900-24F4S#configure terminal
S3900-24F4S(config)#vlan database
S3900-24F4S(config-vlan)#vlan 10
S3900-24F4S(config-vlan)#exit
S3900-24F4S(config)#interface ethernet 1/23
S3900-24F4S(config-if)#switchport mode access
S3900-24F4S(config-if)#switchport access vlan 10
S3900-24F4S(config-if)#exit
S3900-24F4S(config)#interface ethernet 1/24
S3900-24F4S(config-if)#switchport mode access
S3900-24F4S(config-if)#switchport access vlan 10
S3900-24F4S(config-if)#exit
S3900-24F4S(config)#ip dhcp snooping
S3900-24F4S(config)#ip dhcp snooping vlan 10
S3900-24F4S(config)#interface ethernet 1/24
S3900-24F4S(config-if)#ip dhcp snooping trust
S3900-24F4S(config-if)#end
S3900-24F4S#show ip dhcp snooping binding
Voice VLAN Configuration on FS S3900 Series Switches
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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