Troubleshoot layer 2 (data link) issues - Amazon Direct Connect
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Troubleshoot layer 2 (data link) issues

If your Amazon Direct Connect physical connection is up but your virtual interface is down, use the following steps to troubleshoot the issue.

  1. If you cannot ping the Amazon peer IP address, verify that your peer IP address is configured correctly and in the correct VLAN. Ensure that the IP address is configured in the VLAN subinterface and not the physical interface (for example, GigabitEthernet0/0.123 instead of GigabitEthernet0/0).

  2. Verify if the router has a MAC address entry from the Amazon endpoint in your address resolution protocol (ARP) table.

  3. Ensure that any intermediate devices between endpoints have VLAN trunking enabled for your 802.1Q VLAN tag. ARP cannot be established on the Amazon side until Amazon receives tagged traffic.

  4. Clear your or your provider's ARP table cache.

  5. If the above steps do not establish ARP or you still cannot ping the Amazon peer IP, contact Amazon Support.

The following flow chart contains the steps to diagnose issues with the data link.

Troubleshoot Amazon Direct Connect

If the BGP session is still not established after verifying these steps, see Troubleshoot layer 3/4 (Network/Transport) issues. If the BGP session is established but you are experiencing routing issues, see Troubleshoot routing issues.