Research Article
A Table Overflow LDoS Attack Defending Mechanism in Software-Defined Networks
Table 3
Message type description.
| Message type | Message | Function | Analyzed data |
| Controller-to-Switch | flow-mod | Install the flow entries to the switch | — | flow-stats-request | Request the switch for flow entry statistics field information | — | table-stats-request | Request the switch for flow table space usage | — |
| Asynchronous | state-change | Send switch connection and disconnect events to the controller | Update the number of SDN switches | packet-in | Forward packets to the controller | The arrival rate of new flow | flow-stats-reply | Reply to flow entry statistics field information to the controller | Flow entries matched packet, bytes, and duration | table-stats-reply | Reply to flow table usage to the controller | Number of active flow entries | flow-removed | Reports to the controller that the switch deletes the flow entry | Delete the corresponding flow entry data in the record |
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Note: OpenFlow specification v.1.3 was referenced for SAIA design.
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