I have several mikrotik switches.

Apparently i am seeing a large number of rapid DHCP offers to my other switches on the network.

Non of these have a configured DHCP client. Their addresses are configured manually.

what i get in the log is this...

dhcp_primary offering lease 192.168.0.5 for C4:AD:34:F4:36:4F without success

I get two of these for every other switch on the network. Everything is vlan 1 and untagged except the bridge interfaces

This list of offers seems to repeat every 5 seconds. No other device is having an issue receiving a DHCP lease.

All devices are running 7.12.1.

dhcp_primary offering lease 192.168.0.5 for C4:AD:34:F4:36:4F without success

Have you identified the device? Is it yours? Silly question but valid.
If not, according to the mac it is also a Mikrotik and maybe that is running a DHCP client.

Regards.

Yes.

• CRS309-1G-8S+
  7.11.2 (stable) Aug/31/2023 13:55:47

But that is only one of 5 devices that are all apparently being offered DHCP leases when no client appears to be configured.
In this case, MAC is that of the eth1 port on the switch.

But that is only one of 5 devices that are all apparently being offered DHCP leases when no client appears to be configured.

Show the config