DCHP IP Changed

[hs08]

Hello,

My laptop ip address is 10.100.50.31 under vlan 250, then i try to change my vlan to other vlan for testing purpose. When i back to vlan 250 i feel strange that my ip is changed and not use 10.100.50.31.

Checked there is no mac address change in my NIC. Anyone know why?

Here my dhcp server config

!
network 10.100.50.0 255.255.255.0
default-router 10.100.50.1
dns-server 10.200.1.1
lease 7

[MHM Cisco World]

dont worry this will not change anything 
same MAC different VLAN 
dhcp pool is per vlan

MHM

MHM

[hs08]

correct, and i still curious why my laptop keep get different ip.

[hs08]

I can see for my laptop previous entry in the dhcp biding is removed when vlan changed. So with this condition the client will always have a new different ip. Different scenario for my gadget where the previous entry is retained when vlan changed.

[MHM Cisco World]

I think I get answer for this case 

If client send dhcp request then it get new IP

If client send dhcp inform then it get same IP and dhcp server not assign new IP' 

But dhcp inform is not send by cisco device as I check (I will do more check and update you)

MHM

[hs08]

Hi @MHM Cisco World 

Noted, parallel i also just create ticket to TAC and will share the result here.

[MHM Cisco World]

Updated us when you get reply 

Thanks alot 

MHM