This can only be completed from the switch with the ARP entries.
To find the MAC address using a known IP address:
show arp | include
To find the IP address using a known MAC address:
show arp | include
Cisco
Finding Switch Port from MAC Address
These commands allow you to search for a MAC address on a switch.
It will then show the port to which the device is connected.
show mac-address-table address 0000.1111.2222
show cdp neighbors
Common Cisco Commands
These are commands that I use on occasions, but always seem forget.
show int phy-id (see stats of port)
show arp (show current switch ip)
show int trunk
show mac-address-table
show mac-address-table address 0000.1111.2222
show vlan
show cdp neighbors detail
show cdp neighbor PORTNAME detail
show switch (list switches in stack)
From TFTP:
copy tftp: running-config
To TFTP:
copy running-config tftp:
Cisco Uplink Port
Enter the following onto the ports that will be designated for the uplink:
switchport trunk encapsulation dot1q
switchport mode trunk
mdix auto
no shut
Cisco Switch Cable Diagnostics
This command is useful to find out if any pairs are open. Just connect a device to the other end, and run the command:
Switch#test cable-diagnostics tdr interface g1/0/2
TDR test started on interface Gi1/0/2
It may take a few seconds to run. Then issue the following command:
Switch#show cable-diagnostics tdr interface gigabitEthernet g1/0/2
TDR test last run on: Oct 12 07:12:12
You should see some results like the following:
Interface Speed Local pair Pair length Remote pair Pair status
--------- ------ ---------- ----------- ----------- -----------
Gi1/0/2 auto Pair A 22 +/- 4 m N/A Open
Pair B 21 +/- 4 m N/A Open
Pair C 5 +/- 4 m N/A Open
Pair D 20 +/- 4 m N/A Open