DHCP not forwarding DHCP requests

[zgeorgios]

I've created 2 VLAN's (200,400) for data and voice on 2 independent switches

The data switch is connected to the X0 port on the firewall and a Windows DHCP server where all users receive IPs.

The voice switch is connected to the X3 port on the firewall and all phones receive DHCP through the firewall.

When I try to uplink to a switch (LAG from each switch data and voice) I receive DHCP only from data and not from voice

Am I doing something wrong?

[balaji.bandi]

When I try to uplink to a switch (LAG from each switch data and voice) I receive DHCP only from data and not from voice

this part is not clear to us, you already connected each switch to FW, how you connecting another switch as mentioned above.

Do you have any small rough diagram of how you connected?

other checks :

check VLAN allowed in the trunk

[Georg Pauwen]

Hello,

do all Vlans actually exist on the uplinked switch (sh vlan) ? You might have to create them manually...

[zgeorgios]

I created a LAG from each switch on the uplinked switch. When I connect to a V200 port I get DHCP, if I connect at the same time to V400 I don't get any DHCP

If I disconnect V200 LAG I can get DHCP from V400

[zgeorgios]

Hi Balaji, 

Hope the diagram will shed some light

[Reza Sharifi]

If I am reading your diagram correctly, the SG550 in the small office connects to the other 2 SG-550 switches. If that is the case, you need to have vlan 200 and 400 on the LAG connection and as well as the other 2 SG-550 switches connecting to the firewall. So, basically, you need to have trunk ports between all switches with vlan 200 and 400 in them.

HTH 

[Georg Pauwen]

Hello,

the LAG seems to be connected to multiple switches ? Not sure that will work. Remove the LAG altogether and configure the links between the switches as trunks.

[zgeorgios]

I tried that as well. Connected trunk tagged ports instead of LAG and still the same.

[Reza Sharifi]

You also need to make the connections from the 2 SG-550 switches that connect to the firewall trunk ports as well.

HTH

[zgeorgios]

Yes they are trunk ports since the firewall X0-V200 its a virtual interface

[Reza Sharifi]

Also, the 2 SG-550 switches that connect to the firewall are stacked, right? If not you can not LAG a switch to 2 other separate switches.

HTH

[zgeorgios]

No, they are not stacked together, they are independent.

[Georg Pauwen]

Hello,

configure the trunks so that only Vlan 200 is allowed on the trunk on the left, and Vlan 400 on the trunk on the right.

[zgeorgios]

Dear Georg,

The left switch has only V200, same as the right switch that has only V400, and each switch connect to V200 and V400 tagged ports on the uplink switch.