Network system including lower and upper switches and link group interconnecting lower switches to upper switches, and method of operating the same

摘要

A network system includes a plurality of lower switches, a plurality of upper switches, and a link group for interconnecting the plurality of lower switches to the plurality of upper switches in a multipoint-to-multipoint relationship. The link group includes a sub-link for interconnecting the plurality of lower switches to the plurality of upper switches in a point-to-point relationship as one logical link and a main link for interconnecting the plurality of lower switches to the plurality of upper switches in a point-to-multipoint relationship as one logical link. The plurality of lower switches are each set such that a broadcast frame with a broadcast address set as a destination is transmitted to the plurality of upper switches through the sub-link. The plurality of upper switches each receive the broadcast frame and resister a source address contained in the broadcast frame into an FDB of the plurality of upper switches.

主权项

1. A network system, comprising:
a plurality of lower switches; a plurality of upper switches; and a link group for interconnecting the plurality of lower switches to the plurality of upper switches in a multipoint-to-multipoint relationship, wherein the link group comprises a sub-link for interconnecting the plurality of lower switches to the plurality of upper switches in a point-to-point relationship as one logical link and a main link for interconnecting the plurality of lower switches to the plurality of upper switches in a point-to-multipoint relationship as one logical link, wherein the plurality of lower switches are each set to conduct a broadcast transmission such that a broadcast frame with a broadcast address set as a destination is transmitted to the plurality of upper switches through the sub-link that is available for communication and connected to the plurality of lower switches, wherein the plurality of upper switches each receive the broadcast frame and register a source address contained in the broadcast frame into a forwarding database (FDB) of the plurality of upper switches, wherein said each of lower switches comprises:
a plurality of first ports, each of the first ports being connected to one of the plurality of upper switches; anda second port different from the first ports, wherein, when said each of the lower switches receives the broadcast frame at the second port, the broadcast frame is transmitted to the plurality of upper switches, wherein the broadcast frame is transmitted to all of the plurality of upper switches through all sub-links that are available for communication and are connected to said each of the plurality of lower switches, wherein a first port of the plurality of first ports belongs to a link aggregation group (LAG), and wherein, for transferring a unicast frame that a destination address is set to be a specific MAC address, a frame transfer unit transfers the unicast frame by reference to the FDB and an LAG table.