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Find the port from which the IP address comes from on the aggregation switch

You can locate the port for a specific IP by first finding its MAC address via ARP, then tracing that MAC through the switch's MAC address table to identify the connected port.Step-by-Step Process

1. Identify the MAC Address of the IP

  • Ping the target IP from a device on the same subnet to populate the ARP table.
  • On a Cisco switch or router, run show ip arp to find the MAC address associated with the IP . 2. Check the MAC Address Table
  • On the aggregation switch, use the command show mac address-table address .
  • This will display the VLAN and the interface (port) where the MAC is learned . 3. Trace Through Uplink Ports if Necessary
  • If the MAC appears on a trunk or uplink port, the device is connected downstream.
  • Use show cdp neighbor or show lldp neighbors to identify the next switch in the path.
  • Log into the downstream switch and repeat the MAC lookup until you find the access port where the device is directly connected . 4. Verify the Port
  • Once the MAC is found on an access port, you can confirm by checking the ARP table on that switch or by monitoring traffic on the port.
  • Optionally, configure port descriptions to document the device for future reference .
Additional Tips
  • Enable IP Device Tracking on Cisco switches to simplify future lookups: ip device tracking and ip device tracking probe delay 30 .
  • For Layer 2 switches, you may need to consult the router performing Layer 3 routing to locate the MAC if the IP is on a different VLAN .
  • Documenting the network topology helps reduce the number of switches you need to check when tracing devices . By following these steps, you can reliably determine the physical port on the aggregation switch where a device with a given IP address is connected.
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Technical note

This reference is intended for preliminary optical-network research. Compatibility, link budgets, installation methods, test limits and applicable standards must be verified for the specific project.

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