Ipv6 route preference

Question

Hello all, I have DA server in my network. isatap NIC is advertising ipv6 routes (include default route) for all my computers. Also I have ipv6 router, which provide access to Internet. If I look to route table on client computer, I see two IPv6 default
route with same metric. Because my DA server do not provide access to internet, I'm losing half outbound IPv6 packet to Internet (if you have two routes with same metric, your computer will use round robin for outbound packets).
Can I set preferences parameter for default route advertise on DA server?
PS If I disable advertise default route on isatap, I'll get to error in remote access management console.

Answer 1

It's tricky given that BGP's AD is always going to beat out EIGRP's all other things being equal. Most of the things you can do with BGP route-maps involve making one BGP route preferred over another.
You could inject the preferred path as a static route (AD = 1) to the firewall using an ip sla operation and having the static route track that. Once the ip sla operation fails, the static route is withdrawn and then the BGP-learned route (AD = 20) will take precedence.