?How to check whether an IKE session exists ?

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Run the display firewall session table verbose destination-port500. If the IKE session exists, the IKE security policy allows the VPN traffic to pass through. Otherwise, separately configure the IKE security policy.

Other related questions:
How can I check whether a loop exists on an S series switch
The simplest way to check the existence of a loop on an S series switch (except the S1700) is to check whether a MAC address flapping alarm exists on the switch. If the alarm exists, you can quickly locate the loop based on the information in the alarm. Run the display mac-address flapping record command to check whether MAC address flapping exists, or run the display trapbuffer command to check whether the alarm contains The mac-address has flap value or MAC move detected. For more information, visit Layer 2 Loop Troubleshooting.

How to to check whether a valid management exists the AP
Log in to the AP and run the display system-information command. If a management VLAN is incorrectly configured for the AP, run the undo management-vlan command on the AC to delete the management VLAN, and restart the AP.

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