Due to a ransomware attack, the wiki was reverted to a July 2022 version. . We apologize for the lack of a more recent valid backup.
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Software Modules
The following figure illustrates the SDN-IP application components, and the relationship among those components.
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Configuration - this service is used for accessing ONOS configuration.
ArpService - this service is used to resolve the MAC addresses of the best next-hop IP addresses for the routes (i.e., the IP addresses of the directly attached eBGP routers).
IntentService - this service is used to submit Intent requests. The translation between Intent requests and OpenFlow entries, and the installation of the OpenFlow entries into the switches is handled by ONOS itself. This process is totally transparent to the SDN-IP application.
LeadershipService - this service is used to elect the SDN-IP Application Leader. The Leader is responsible for submitting the Intent requests. The remaining SDN-IP instances are in stand-by mode in case of a Leader failure.
The BgpSessionManager
The BgpSessionManager is responsible for interfacing with the BGP speakers. It listens for incoming iBGP connections, and creates a BgpSession instance per-session. The BgpSession instance is responsible for the following:
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The BgpSessionManager collects all the BGP routing updates from the iBGP peers, and uses the BGP rules to select the best next-hop router for each IP routing prefix. Then it generates the corresponding routing entries and submits them to the RouteListener. The following figure summarizes this function:
Interaction with the ARP Service
The ARP Service is used to resolve the MAC address of each IP address that is used as the best next-hop router. The number of such IP addresses is limited by the number of the external eBGP routers. SDN-IP subscribes for receiving the ARP updates for each potential next-hop IP address. If a BGP routing update is received before the MAC address is resolved, the routing update is placed into a queue until the address is resolved.
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