F5 Link controller ISP migration considerations

Hi, I assume you are using wideip names for the hosted web apps that currently resolve to Virtuals on both ISP links for inbound load balancing. I also assume you are only looking at inbound traffic. Steps below pertain mainly to modifying the wideip members for a wideip name.

My thoughts:

1. Connect the new ISP link to LC so it runs parallel to the existing two links
2. Create a new Virtual on the new ISP link for a specific hosted web app
3. For its corresponding wideip name, disable/remove the Virtual (i.e. wideip member) on the to-be-removed ISP link for the specific hosted web app
4. For the same wideip name, add the new Virtual created on the new ISP link. So now the wideip name can resolve to one of the existing Virtual AND also the new Virtual on the new ISP link (result would depend on lb method used).
5. Repeat the steps above per wideip name as necessary until all hosted web apps are accounted for on the new ISP link.

Hope this helps.