Network Functionality and Deployability

Intranet Route Eligibility Determined by Path State

A new feature has been added in Oracle SD-WAN Edge Release 2.4 to determine Intranet route eligibility by path state as opposed to WAN link state. In the past, a route was ineligible if the WAN link was down, but there were cases where the WAN link was only down at one site. This caused the Intranet data to not flow between sites. To resolve this issue the Oracle appliance now can make a path eligible/ineligible decision based on path state and not just WAN link state. The “Route Eligible Path” is a path whose status is used to determine whether a route is eligible to be used when making routing decisions.

As shown in Figure 1 above, there are four sites in a sample prior release network. There is a conduit from A to B and a conduit from B to C. WAN links a2 and b2 are also configured with intranet service. When a2 fails, all paths using a2 are dead, so a2 is in WAN link DEAD state. Intranet traffic going from site A to site B will then skip the intranet route and use the available conduit route. At site B, since b2 is used for a path for the B-C conduit, it remains in a GOOD state. Intranet traffic from site B to site A will continue to use the intranet route that enters the network on the b2 link and exits the network on the a2 link. This traffic will fail to reach the destination since a2 is down.

To solve this problem, this new feature allows a user to add an eligible path to the intranet route. When doing a route lookup, the intranet route is now skipped if the eligible path is DEAD.

One Route Eligible Path can be configured for each dynamic and/or user-configured static intranet route but there is no limit on the number of intranet routes that can be configured to use a Route Eligible Path. The configuration editor allows a path to be configured as a Route Eligible Path for user's static intranet routes. Adding, deleting, or changing the Route Eligible Path on an intranet route does not require a reset of the

Oracle SD-WAN Edge (please see Figure 2). For more information on the Oracle SD-WAN Edge Configuration Editor, please see the Oracle SD-WAN Edge Configuration Editor User's Guide.

Route Eligible Path can also be set by editing the configuration file itself. The command line options would include the following:

add route

net=10.0.0.0/8 intranet_service_name=Intranet-1 route_eligibility_based_on_path=true

route_eligibility_from_wan_link=a2

route_eligibility_to_wan_link=b2 service=INTRANET;

route_eligibility_based_on_path =Boolean

This feature allows a user to add an eligible path to the Intranet route. For Intranet Services, enable the Intranet route failover feature. Route eligibility will be based on the state of an associated path.

route_eligibility_from_wan_link_name = Text The “from” WAN link name for the path that determines whether to mark this route as ineligible, based on the state of the specified path.

route_eligibility_to_wan_link_name =Text

The “to” WAN link name for the path that determines whether to mark this route as ineligible, based on the state of the specified path.

As defined above, the configuration requires the user to specify the WAN links and to enable the feature. For more information on the Oracle SD-WAN Edge configuration file, please see the APN Configuration Reference.