Security data flow: 3100/IPv4 //Security ACLĪdvanced ACL 3100, 1 rule ( Reference counter 1 ) Run the display ipsec policy command to check the security ACL number and then run the display acl acl-number command to check whether the security ACL configuration matches the IPSec-protected data flow. Check whether the security ACL configuration matches the IPSec-protected data flow.If not, apply an IPSec policy to this interface. Run the display ipsec interface brief command to check whether the tunnel interface has IPSec policy information. Check whether an IPSec policy is correctly applied to a tunnel interface.If not, ensure that the links are normal, interfaces are Up, and network configurations such as the routing configuration are correct. Run the ping command to check whether private and public network routes are reachable. Check whether private and public network routes are reachable.This configuration ensures that IKE negotiation can be triggered when no service traffic exists. Run the sa trigger-mode auto command in the ISAKMP IPSec policy view to set the IPSec SA triggering mode to automatic triggering. You can trigger IKE negotiation through a ping. The default IPSec SA triggering mode is traffic-based triggering, and the prerequisite for triggering IKE negotiation is that service traffic exists. SA trigger mode: Traffic-based //IPSec SA triggering mode IPSec SA local duration(traffic based): 1843200 kilobytes IPSec SA local duration(time based): 3600 seconds Run the display ipsec policy command to check the IPSec SA triggering mode.The following lists two IPSec fault trees: IPSec tunnel setup failure and abnormal IPSec services. Understanding the overall troubleshooting roadmap helps network administrators quickly locate and process faults. For complex faults, the network administrator can analyze triggering causes layer by layer based on the fault symptom and IPSec working principles to find the root cause. Such faults need to be processed based on the specific scenario.ĭuring routine maintenance or after receiving a fault report, a network administrator can find the troubleshooting guidance by referring to this figure. ![]() Usually, other IPSec faults are caused by incorrect feature configurations, such as interfaces, Access Control Lists (ACLs), routes, and network address translation (NAT). You can carry out in-depth analysis on the IKE negotiation process. IKE SA or IPSec SA negotiation failure is the core issue in IPSec faults. Data transmission stage: Services are abnormal (interrupted or of poor quality) after successful IPSec tunnel setup.Tunnel setup stage: An IKE SA or IPSec SA negotiation failure leads to an IPSec tunnel setup failure. ![]()
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