Relay system and switching device

摘要

A first L2SW acquires a correspondence relation between a multicast group and a representative IP address retained in a snooping table of a second L2SW through a control plane, and registers the correspondence relation to a snooping table of the first L2SW. When the first L2SW receives a multicast packet whose destination is a multicast group, the first L2SW extracts a corresponding representative IP address of the other L2SW based on the snooping table of the first L2SW, and converts the multicast packet into a unicast packet whose destination is the extracted representative IP address. When the destination representative IP address contained in the unicast packet is its own representative IP address, the second L2SW converts the unicast packet into multicast packets.

主权项

1. A relay system comprising:
a plurality of switching devices to which different representative IP addresses are set; a layer 3 network connecting the plurality of switching devices; and a control plane connected to the plurality of switching device, wherein each of the plurality of switching devices includes: a snooping unit which, when a request packet representing a join request to a multicast group or a leave request from a multicast group is relayed to a predetermined router, acquires a correspondence relation between a port which has received the request packet and a multicast group contained in the request packet; a snooping table which retains or deletes the correspondence relation between the port and the multicast group acquired by the snooping unit in accordance with the join request or the leave request; a snooping table synchronization unit which acquires a correspondence relation between a multicast group and the representative IP addresses set to other switching devices other than its own switching device retained in the snooping tables of the other switching devices through the control plane and registers the acquired correspondence relation to its own snooping table; a transmission packet conversion unit which, when a multicast packet whose destination is a multicast group is received at a predetermined port, extracts the one or plural representative IP addresses corresponding to the multicast group based on the snooping table and converts the multicast packet into a unicast packet whose destination is the extracted representative IP address; and a reception packet conversion unit which, when a unicast packet whose destination is the representative IP address set to its own switching device is received at a predetermined port, converts the unicast packet into a multicast packet.