Finding What Switch Port An IP Address Is On With Multiple Switches

Finding What Switch Port An IP Address Is On With Multiple Switches

1. Issue  “Show ARP | include a.b.c.d” on the Switch or Router for the subnet of the IP address you are trying to find

2. Issue a “Show Mac Address-table address mac address”

3. Issue a “Show CDP Neighbor” and “Show CDP Neighbor Detail” to find which switch the mac address in located on.

4. Repeat “Show mac address-table address “mac address” on switch until you find the port the IP address in on.

Finding What Switch Port An IP Address Is On

Tracking down an IP address to the physical port on a Cisco switch.

  1. From the switch ping the IP address
  2. Issue a “Show Arp”
  3. Make notice of the MAC address from the ARP table
  4. Issue a “Show Mac address-table | include mac address