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OSPFv3 Autoroute Exclude feature allows you to use specific destinations and prefix-list to specify a list of prefixes that are routed using native paths instead of TE tunnels for packet transport. The rest of the prefixes can still be set to use TE tunnels. Prefixes that are excluded do not use a TE tunnel path. IPv6 routes over TE tunnels are supported by OSPFv3 using Autoroute Announce (AA) or Forwarding Adjacencies (FA).
This module describes how to configure the OSPFv3 Autoroute Exclude feature.
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 route.
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 adjacencies (FA).
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.
See the 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.
| Command or Action | Purpose | |
|---|---|---|
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Step 1 |
enable Example: |
Enables privileged EXEC mode.
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Step 2 |
configure terminal Example: |
Enters global configuration mode. |
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Step 3 |
router ospfv3 process-ID Example: |
Configures OSPFv3 routing process and enters OSPF router configuration mode. |
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Step 4 |
address-family ipv6 unicast Example: |
Enters IPv6 address family configuration mode for OSPFv3. |
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Step 5 |
mpls traffic-engineering autoroute-exclude prefix-list prefix-list-name Example: |
Allows specific destinations and prefixes to avoid routing through TE tunnels.
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Step 6 |
end Example: |
Exits address family configuration mode and returns to privileged EXEC mode. |
!
router ospfv3 18
address-family ipv6 unicast
mpls traffic-engineering autoroute-exclude prefix-list kmd
!
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Related Topic |
Document Title |
|---|---|
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Cisco IOS commands |
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Configuring OSPF |
IP Routing: OSPF Configuration Guide |
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Autoroute Announce and Forwarding Adjacencies For OSPFv3 |
IP Routing: OSPF Configuration Guide |
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Configuring Basic Cisco Express Forwarding |
IP Switching: Cisco Express Forwarding Configuration Guide |
|
MPLS Traffic Engineering Tunnel Source |
MPLS Traffic Engineering Path Calculation and Setup Configuration Guide |
|
Description |
Link |
|---|---|
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The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.
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