How To Refresh MAC Table?
I've got a stack of 3750s running 12.1.14.
I've got CAT5 ethernet cables plugged into ports Gi3/0/12 and Gi3/0/18. The LEDs are green. Show counters indicates that traffic is going through these ports. But for some reason I can't get the MAC address of the devices plugged into this port (which means I'm going to have to trace a LONG cable run through a very tight wiring cabinet).
CoreSwitch#sh mac-add int gi3/0/18 Mac Address Table
-------------------------------------------
Vlan Mac Address Type Ports
---- ----------- -------- ----- CoreSwitch#
I've run IP scans on all our subnets, I've done clear arp -- nothing seems to work. I'm fairly certain there's an ethernet NIC on the other end and that it's got a MAC address -- it has to, right?
Is there any way to force a refresh of the MAC table? Is there any way to trigger a broadcast? (Would pinging 255.255.255.255 work?)
Thanks
read more and respond »Posted 5 years ago by JohnD in Cisco Systems
