How Do SDN Southbound APIs Work?
Southbound APIs facilitate control over the network and enable the SDN Controller to dynamically make changes according to real-time demands and needs.
OpenFlow, which was developed by the Open Networking Foundation (ONF), is the first and probably most well-known southbound interface. OpenFlow defines the way the SDN Controller should interact with the forwarding plane to make adjustments to the network, so it can better adapt to changing business requirements. With OpenFlow, entries can be added and removed to the internal flow-table of switches and routers to make the network more responsive to real-time traffic demands.
Other SBI protocols you may see in the exam include:
1. OpFlex (from Cisco, used with ACI and DNA Centre with new H/W).
2. CLI (Telnet/SSH) and SNMP (used with Cisco APIC-EM and legacy H/W)
3. CLI (Telnet/SSH) and SNMP, and NETCONF (used with Cisco SDA).
4. NETCONF and RESTCONF (used with Cisco DNA Centre)
5. OpenFlow, NETCONF, BGP-LS, OVSDB, etc. (used with ODL)
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