I have created 3 vlans on a layer 3 switch (cisco 3560). The 3 vlans are able to talk by enabling interVlan routing. I have also a DHCP server on one of the vlan, but i don't khow how to enable the DHCP server publish ip addresses to devices sitting into the 2 other vlans.
First make sure that the DHCP server has correct DHCP scopes configured for each subnet. Then on the VLAN interfaces of the switch that are not connected to the DHCP server configure this:
So if you have 3 VLANs that are for example VLAN 2 and 4 and 6. And if the DHCP server is connected on VLAN 4, then end stations in VLAN 4 can communicate directly with the server and be assigned addresses. When you configure ip helper-address on the interfaces VLAN 2 and 6 then the switch will forward DHCP requests from VLAN 2 and 6 to the server in VLAN 4. And the server will be able to assign addresses in all of the subnets/VLANs.
it seems it's working. The devices from different vlans are getting ip addresses, but they are getting a different default-gateway. For example, a device on vlan 6 is getting an ip address within the subnet, but the default gateway is different than the ip address of vlan 6, and obviously i'm losing the connection.
My first guess would be that something is misconfigured in the DHCP server. I do not see anything so far that looks like a switch problem. The fact that the PC is getting assigned an IP address seems to show that the helper-address is working and that the PC is communicating with the DHCP server. Can you verify what is configured on the DHCP server for default gateway in the scope for vlan 6?
This document gives several answers on frequently asked questions for PFRv3 channel state behavior.
Q1: What are all the channel operational states from a BR (border role) perspective and what are the rules/conditions to be in each st...
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