Node apparatus and communication method

摘要

A node apparatus includes a TTL memory configured to store a TTL value for a first node apparatus in the cluster; a receiving unit configured to receive a first Hello packet including a first sequence number and a second Hello packet including a second sequence number that is incremented when the node apparatus transmits a Hello packet; a sequence number judging unit configured to judge whether a first sequence number and a second sequence number match each other; a TTL decrementing unit configured to perform a process to decrement the TTL value stored in the TTL memory, when the first sequence number and the second sequence number are identical according to a judgment; and a cluster information updating unit configured to separate the first node apparatus from the cluster, when the TTL value for the first node apparatus becomes equal to or smaller than a prescribed value.

主权项

1. A node apparatus in a network including a plurality of node apparatuses, comprising:
a cluster information memory configured to store information related to node apparatuses included in a cluster which is a group of node apparatuses for which the node apparatus stores route information related to a route for information communication in the network, the information being also related to an origin node that is an origin of the cluster, among the plurality of node apparatuses in the network; a TTL memory configured to store a TTL value defined as an integer value for a first node apparatus that is included in the cluster and that is different from the node apparatus, the TTL value having a prescribed default value; and a processor configured to perform a process including
receiving a first Hello packet and a second Hello packet including a sequence number that is defined for the first node apparatus and that is incremented every time when the first node apparatus transmits a Hello packet used to report the route information, the first Hello packet and the second Hello packet being transmitted by the first node apparatus at different timings;judging whether a first sequence number for the first node apparatus included in the first Hello packet and a second sequence number for the first node apparatus included in the second Hello packet match each other;decrementing the TTL value stored in the TTL memory, when the first sequence number and the second sequence number are determined to be identical by the judging; andseparating the first node apparatus from the cluster by deleting an identifier of the first node apparatus from the cluster information memory, when the TTL value for the first node apparatus becomes equal to or smaller than a prescribed value.