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[ScreenOS] Routing issue when RIP is used in the hub and spoke VPN

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Article ID: KB26647 KB Last Updated: 11 Feb 2013Version: 1.0
Summary:
This article describes the issue of the routes being populated between the hub and spokes, but now between the spokes, when RIP is used for dynamic routing in a hub and spoke VPN scenario with a single tunnel interface.
Symptoms:
Routes are populated between the hub and the spokes, but not between the spokes, when RIP is used for dynamic routing in a hub and spoke VPN scenario with a single tunnel interface.
Cause:
This issue occurs when either of the following options are selected on the tunnel interface that is bound to the VPN:

  • Split horizon with poison reverse.

  • Split horizon without poison reverse.

When Split horizon is enabled, the routes that are received on one interface are not re-advertised via the same interface. This prevents the routes from one spoke to be populated on another spoke.
Solution:
For this to work, you have to disable split horizon on the tunnel interface that is being shared by the VPNs.

The command for this is:
unset interface <tunnel interface name> protocol RIP split-horizon
Alternatively, via the WebUI, go to Network > Interfaces, edit the tunnel interface, go to RIP, and select the Disabled radio button for the Split Horizon section:

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