NETWORK TRANSITION METHOD

摘要

PROBLEM TO BE SOLVED: To perform fault-tolerant transition in a layer-3 only by switching in a protocol for multiplexing a router and a dynamic routing protocol, in a network in which a plurality of distribution devices are connected to a core layer network and which has no loop configurations.

SOLUTION: A network transition method includes: a step of producing a bypass of a layer-2 topology between a transition source network and a transition destination network (S01); a step of changing a server wire connection to a transition destination access switch (S02); a step of changing a sub-system default gateway to a transition destination sub-system distribution device (S03) and exchanging primary-system and sub-system default gateways (S04); a step of making a return communication path accord with an outgoing communication path (S05); a step of changing the sub-system default gateway to a transition destination primary-system distribution device (S06) and exchanging the primary-system and sub-system default gateways (S07); and a step of removing the bypass (S08).

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