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What does the Ready State tell us in the route table?

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Article ID: KB6404 KB Last Updated: 06 Jan 2009Version: 4.0
Summary:
What does the Ready State tell us in the route table?
Symptoms:
Environment:
  • Tunnel interface with VPN Monitor
  • VPN Monitor
  • Rekey Option
  • get route
  • State of a route
Solution:

This solution describes the state of the tunnel interface when using VPN Monitor with/without Re-key option

Tunnel Interface without VPN Monitor and Rekey Option: Tunnel interface will always be in ready state as there is no mechanism to identify the correct state

Tunnel Interface with only VPN Monitor Turned On: If using NSRP, during initial boot up process, the system will have the tunnel interface in ready state "R" on the master unit, and inactive on the backup unit.  The Ready state indicates that the Tunnel interface is Ready to pass traffic through, but needs something to trigger the VPN so the SA's can be up.  Once the SA becomes up, tunnel interface state goes to the Up state.  If a cable is physically pulled out of the interface that the tunnel interface is bound to, the tunnel interface state will change to a Down state.

Tunnel Interface with VPN Monitor and Rekey Option enabled: If re-key option is used along with VPN Monitor, this will keep the SA's up.  It will not wait for actual traffic to trigger the VPN, and cause the tunnel interface to switch from R to U state.

For more related information, refer to KB6221 - What is the state of a tunnel Interface when the associated VPN tunnel went down.

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