IPv6 IS-IS administrative distance

For example, if the device has a path from iBGP, from OSPFv3, and IPv6 IS-IS to the same destination, and all the paths are using their protocols‘ default administrative distances, the device selects the OSPFv3 path, because that path has a lower administrative distance than the iBGP and IPv6 IS-IS paths.

The default IPv6 administrative distances on the device are:

• Directly connected - 0 (this value is not configurable)
• Static - 1 (applies to all static routes, including default routes)
• eBGP - 20
• OSPFv3 - 110
• IPv6 IS-IS - 115
• iBGP - 200
• Local BGP - 200
• Unknown - 255 (the device will not use this route)

Lower administrative distances are preferred over higher distances. For example, if the device receives routes for the same network from IPv6 IS-IS and from iBGP, it will prefer the IPv6 IS-IS route by default.