I have 3 hosts A, B and C. A connects to B and B connects to C. A and C have no direct connection. A and C have a default route for BGP and ISIS (done with default originate command fo ISIS). A and C have local firewalls with A being primary. They are all IBGP neighbors. I need to raise default route metric of ISIS so C will use its BGP route instead.
v4 IGP is OSPF which i just mark up with a route map, I don't see similar options for ISIS.