Hello, Tricircle plans to provide L2 network across Neutron to ease supporting application geo-redundancy:
For example, in the following figure, the application is consisted of instance1 and instance2, these two instances will be deployed into two OpenStack. Intance1 will provide service through "ext net1"(i.e, external network in OpenStack1), and Instance2 will provide service through "ext net2". Instance1 and Instance2 will be plugged into same L2 network net3 for data replication( for example database replication ). +-----------------+ +-----------------+ |OpenStack1 | |OpenStack2 | | | | | | ext net1 | | ext net2 | | +-----+-----+ | | +-----+-----+ | | | | | | | | | | | | | | +--+--+ | | +--+--+ | | | | | | | | | | | R1 | | | | R2 | | | | | | | | | | | +--+--+ | | +--+--+ | | | | | | | | | | | | | | +---+-+-+ | | +---+-+-+ | | net1 | | | net2 | | | | | | | | | +--------+--+ | | +--------+--+ | | | Instance1 | | | | Instance2 | | | +-----------+ | | +-----------+ | | | | | | | | | | net3 | | | | +------+-------------------------+----+ | | | | | +-----------------+ +-----------------+ When we deploy the application in such a way, no matter which part of the application stops providing service, the other part can still provide service, and take the workload from the failure one. It'll bring the failure torelance no matter the failure is due to OpenStack crush or upgrade, or part of the application crush or upgrade. This mode can work very well and helpful, and router R1 R2 can run in DVR or legacy mode. Another way is to directly connect the VNF to provider network, while another L2 network(net3) for geo-site application data replication need: +-----------------+ +-----------------+ |OpenStack1 | |OpenStack2 | | | | | | provider net1 | | provider net2 | | +--+---------+ | | +--+---------+ | | | | | | | | | | | | | | +--+--------+ | | +--+--------+ | | | VNF | | | | VNF | | | | Instance1 | | | | Instance2 | | | +------+----+ | | +------+----+ | | | | | | | | | | | | | | | | net3 | | | | +------+-------------------------+---+ | | | | | +-----------------+ +-----------------+ Welcome to review the patch for different networking scenarios, and check to see if these scenarios can meet your application geo-redundancy requirements: Layer-3 networking and combined bridge network spec https://review.openstack.org/#/c/396564/ Best Regards Chaoyi Huang (joehuang)
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