How to advertise default route to OSPF when there are 2 ISPS on egress interface.

Created Jun 30, 2018 10:14:02 366 0 0 0
ssue Description

Customer feedback that there are 2 ISP and when one is down, users will not go to another ISP.

               

All of the devices run OSPF and default route are advertised to OSPF.

 

USG version: V500R001C30SPC100

NE version: NE05E V300R002C10SPC200 

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transparent.gif Handling Process

Remote to check the configuration.

Both NE advertise the default route as below:

                OSPF 1

                Default-route-advertise type 1

                OSPF 1

                Default-route-advertise type 1 cost 200

Check route on NE1, there is no any default route from OSPF from NE2.

transparent.gif Root Cause

If neither always nor permit-calculate-other is configured,

·         when there are active default routes of other processes in the routing table of the host, the device does not calculate the default routes from other devices.

·         when there are not active default routes of other processes in the routing table of the host, the device still calculates the default routes from other devices.


transparent.gif Solution

Modify the configuration on NE1 as below:

            OSPF 1

           Default-route-advertise permit-calculate-other type 1

  • x
  • convention:

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