how to adjust interface metric in ospf to define desired route ?

[venkat_g]

I have to two virtual routers 

VR_1 - e1/1 - is connected to wan 1, e1/3 - is connected to internal network, e1/4 is connected to a switch so, VR_1 has e1/1,1/3,1/4 and I want the primary ospf route to be from e1/4. what changes should I make to do set all routes pass through e1/4.

VR_2 - e1/2 - is connected to wan 2.

currently all interfaces are in ospf network.

[ArminGradscevic]

You can do this under the VR. VR > OSPF 

[OtakarKlier]

Hello,

To supplement what @ArminGradscevic stated:

Networking Tab -> Virtual Routers-> the virtual router you are using->OSPF->Area->Interface tab

Then select the interface you want to make a heavier weight and set the metric. I usually keep my default one as the default of 10. Then I use intervals of 5000 for metrics since that usually is enough to override what OSPF selects. The higher the number, the less desirable OSPF will make that route.

https://docs.paloaltonetworks.com/pan-os/10-0/pan-os-admin/networking/ospf.html

Hope that helps.