Packet forwarding system, control apparatus, packet forwarding method, and program

A control apparatus, which is connected to a group of first relay apparatuses that are connected to each other and a second relay apparatus that comprises a plurality of ports and that is connected to each of the first relay apparatuses and which configures a trunk(s) serving as a virtual logical link(s) by using physical links among the first and second relay apparatuses;

• wherein the control apparatus determines a designated port from ports of the first relay apparatuses included in the trunk;
• and
• wherein the control apparatus controls, when a relay apparatus included in the group of first relay apparatuses receives a predetermined control target packet, the group of first relay apparatuses to transmit the received control target packet via a relay apparatus having the designated port.

A packet forwarding method, comprising:

• by a control apparatus, which is connected to a group of first relay apparatuses that are connected to each other and a second relay apparatus that has a plurality of ports and that is connected to each of the first relay apparatuses and which configures a trunk(s) serving as a virtual logical link(s) by using physical links among the first and second relay apparatuses, determining a designated port from ports of the first relay apparatuses included in the trunk;
• and
• controlling, when a relay apparatus included in the group of first relay apparatuses receives a predetermined control target packet, the group of first relay apparatuses to transmit the received control target packet via a relay apparatus having the designated port.

A non-transitory computer-readable recording medium storing a program, causing a computer constituting a control apparatus, which is connected to a group of first relay apparatuses that are connected to each other and a second relay apparatus that comprises a plurality of ports and that is connected to each of the first relay apparatuses and which configures a trunk(s) serving as a virtual logical link(s) by using physical links among the first and second relay apparatuses, to execute:

• determining a designated port from ports of the first relay apparatuses included in the trunk;
• and
• controlling, when a relay apparatus included in the group of first relay apparatuses receives a predetermined control target packet, the group of first relay apparatuses to transmit the received control target packet via a relay apparatus having the designated port.