how dhcp pool get assigned to which vlan?

[baselzind]

when i create a dhcp pool on a layer 2 switch , how does the switch decide which vlan should get assigned this dhcp pool ? like if there is many vlans on a switch and i create a dhcp pool , how it chooses which vlan to give ip addresses for ?

[marce1000]

 - It's based on the network assigned ip range for the particular vlan  which get's re-defined for the particular pool in the DHCP configuration , below you will find a typical example :

   https://stackoverflow.com/questions/16689051/configuring-a-dhcp-server-with-vlan-on-a-switch

 M.

[balaji.bandi]

here is good reference guide : let us know any further asistance 

https://www.freeccnaworkbook.com/workbooks/ccna/configuring-an-ip-dhcp-helper-address

[Lucas Rene]

Hi!

Previously to the DHCP config, im sure you have one of your switch ports assigned to some VLAN, and there is the thing. When you do this the switch goes by default to that vlan´s gateway, and currently that vlan gateway is configured in the DHCP POOL, so at that point its pretty easy for the switch to understand wich pool of ip addresses should assign their ip´s.

[baselzind]

no im saying let us get a switch out of the box and create vlan 1 to 10 and distribute them on its interfaces and create a dhcp pool on it , which vlan gets the dhcp pool out of these ten vlans?

[baselzind]

please any expert can answer?

[Deepak Kumar]

Hi,

The DHCP client broadcasts a request for an IP address and additional configuration parameters on its local LAN. As part of this DHCP message, the relay agent inserts the IP address of the interface containing the ip helper-address command into the gateway IP address (giaddr) field of the DHCP packet. This IP address enables the DHCP server to determine which subnet should receive the offer and identify the appropriate IP address range to offer. The DHCP relay agent sends the local broadcast, via IP unicast, to the DHCP server address specified by the ip helper-address interface configuration command. 

[Jaderson Pessoa · Accepted solution]

Well.

1. Layer 2: Have possibility to create just one SVI to management. In this case, you can create a DHCP pool for this VLAN. For each dhcp pool you will need appoint a default gateway, if you dont have a L3 device, L2 cannot assign it, because a SVI limitation.

I think that is it.