Continuously "Sending ARP request for local IP address"...

[d-hierholzer]

Hi, 

one of our devices continuously sends out following:

%ARP-3-REQ_IP:  arp [3777]  Sending ARP request for local IP address 10.x.y.z on Vlan30, request from pid: 3970

If I do a "show process | i 3970" it says it's the monitor process.

I've played around with the monitor process some days ago but disabled all the monitor session with shut afterwards.

cisco Nexus 5672UP

system:    version 7.0(5)N1(1)

'logging level arp 2' would mute the notification but this is not the goal...

Any ideas how to solve this properly? 

Thanks, 

Denis

[d-hierholzer · Accepted solution]

Turns out that the ERSPAN was the problem. We've locally defined a ERSPAN source but also on the same device an ERSPAN destination session with an IP of the local loopback.

Background: we had to merge traffic from 2 ports on different Nexus switches on one destination port.

Solution: Use a ERSPAN source session from the remote Nexus with a ERSPAN destination session on the local Nexus and also reuse the same ERSPAN destination port within a local simple SPAN session.