DHCP relay on T2600G-28TS v2

DHCP relay on T2600G-28TS v2
DHCP relay on T2600G-28TS v2
2020-02-05 02:04:25 - last edited 2020-02-05 11:06:42
Hardware Version: V2
Firmware Version:

Hi.

 

I managed to set up dhcp relay using a t2600g-28ts switch as the relay agent and another one as the server, following the instructions in the manual. I then realized that I have another switch on the network, a tl-sg2424, which doesn't support dhcp relay. And I came up with the following setup:

 

Switch S1 - T2600G-28TS

- dhcp server - enabled

- ports 1 to 8 in vlan2, ports 9 to 16 in vlan3, and ports 17 to 24 in vlan 1

- added port 24 both in vlan2 and vlan3 and changed it to be a trunk port

- added L3 interfaces for each vlan

- added a dhcp pool for each vlan

 

Switch S2 - T2600G-28TS

- ports 1 to 8 in vlan2, ports 9 to 16 in vlan3, and ports 17 to 24 in vlan 1

- added port 24 both in vlan2 and vlan3 and changed it to be a trunk port

- added L3 interfaces for each vlan

 

Using this setup the dchp server is reachable from each vlan on both switches and gives the corresponding ip to each host, without dhcp relay.

 

I would like to ask if I'm missing something. Is dhcp relay a must if one has L3 switches with inter-vlan routing capabilities?

 

Now, I also have the old switch, tl-sg2424, without L3 features. Do you think it will work if Switch 2 in the above scenario is a tl-sg2424?

 

Thanks.

 

Alex M.

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Re:DHCP relay on T2600G-28TS v2
2020-02-05 14:44:29

 

AlexMatei wrote

I would like to ask if I'm missing something. Is dhcp relay a must if one has L3 switches with inter-vlan routing capabilities?

 

You will need DHCP relay only if the DHCP server is inside a VLAN / another network and you want to have it serve clients in other VLANs / networks, too.

 

Now, I also have the old switch, tl-sg2424, without L3 features. Do you think it will work if Switch 2 in the above scenario is a tl-sg2424?

 

 

Why not? DHCP requires just a common broadcast domain, no routing involved.

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