VLAN routing between m4300 and GS752 switches Not routing Meraki FW DHCP

[PsiTech]

Hello.

I am trying to setup Vlan routing between a M4300(v12.0.17.6) stack and a GS752(v5.2.0.26) stack.

This is to eliminate the 1gbe Bottleneck between the 2 switch stacks as they were connected through the Meraki FW.

I have 2 VLANs in this setup.

VLAN 1 is the default Corp network (10.0.1.x)

VLAN 10 is the Devlab network (10.0.10.x)

The M4300 defaults to vlan 1 for ports with DHCP coming from Windows Server

the Gs752 Should default to Vlan 10 for ports with DHCP coming from the Firewall/Router

The two stacks are connected with LACP LAG

M4300 has the LAG setup in VLAN Trunk mode

M4300 has The ports connected to the Meraki in Trunk mode

GS752 Has the LAG Vlan 1 tagged, Vlan 10 as Untagged.

All other ports except a test port are set as only VLAN 10 untagged.

Test port on the GS752 (Untagged VLAN 1) Successfully passes DHCP from the windows server

Any other port (Untagged VLAN 10) does not pass DHCP

IS there any additional configuration I'm missing that is preventing DHCP from getting routed?

Thank you.

[schumaku]

DHCP isn't routable, it's a pure L2 protocol.

The most easy way is to bring an adapter of the system handling DHCP into each VLAN. Certain advanced switch levels in the L2+ or L3 classes sometimes offer DHCP relay functionality. From what I understand from your config, the VLAN 10 is configured to the firewall system e.g. for dealing with routing - so there is no reason why the FW based DHCP can't deal with.

[PsiTech]

Adding a network overview for better clarity.

[schumaku]

Very clear to me. With the two VLANs configured, you have two L2 networks on you simple set-up:

VLAN1 does get DHCP from the Windows server, while Internet access as well as intranet access is done by L3 routing on the FW.

VLAN10 does get DHCP from the FW, which does also deal with Internet access as well as intranet access is done by L3 routing on the FW.