The auto route
feature is an IP routing method that forces OSPF to use MPLS TE tunnels to
build paths for IP traffic routes. The auto route feature enables all routes to
use TE Tunnels, even if there is an alternate non-TE path available for that
The OSPFv3 Autoroute Exclude feature allows specific IPv6 destinations
or prefixes to avoid TE tunnels, while other prefixes can still be configured
to use TE tunnels. Prefixes that are excluded do not use a TE tunnel path. Only
native non-TE paths are downloaded to RIB for such routes. IPv6 routes over TE
tunnels are supported by OSPFv3 using auto route announce (AA) or forwarding
The auto route exclude option is configured under the router OSPF
configuration mode by using a prefix list. IP addresses and prefixes that are
members of this prefix list are excluded from TE tunnels, even when the auto
route is enabled on them. If the IP addresses or prefixes are added to the
prefix list, they are dynamically routed without passing through the TE tunnel.
If the IP addresses or prefixes are removed from the prefix list, they are
dynamically rerouted back on the TE tunnel path.
Autoroute Announce and Forwarding Adjacencies
For OSPFv3 module in
IP Routing: OSPF Configuration Guide for details on configuring
auto route announce and forwarding adjacencies For OSPFv3.