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.
A gateway in SONA is a special compute node, which plays role as a connection point to external networks. It performs NAT and PAT for outbound traffics and also exchanges routes with external routers with BGP or OSPF. Scalable gateway provides load balancing and high availability by allowing multiple redundant gateways to the system.
Features
- Provides hash based load balancing load balance of outbound traffics among multiple gateways
- Provides failover fail-over for a gateway failure
- Provides dynamic add or remove of gateway nodes
High Level Architecture
SONA is composed of multiple ONOS applications, and Scalable Gateway and vRouter are takes in charge of the North-South connectivity.
- Scalable Gateway selects and provides a gateway per flowgroup to OpenstackRouting
- SONA OpenstackRouting takes care of forwarding traffic between VM and GNODEoutbound traffic to the gateway group
- SONA OpenstackRouting takes care of NAT/PAT at the gateways
- vRouter takes care of connectivity between GNODEs and external routers
...
- GNODE is composed of two software switches controlled by SONA and vRouter
- br-int which is controlled by SONA, OpenstackRouting module specifically, performs NAT and PAT of for N-S packets
- br-router which is controlled by vRouter makes the GNODE as a legacy router and it performs forwarding packets to right port
Detailed Architecture
- Scalable GW manages the information of GNODEs
- OpenstackRouting requests the information of GNODEs
- Scalable GW provides the load-balancing policy to OpenstackRouting
Scalable GW handles GNODE fail-over and scale-out
