Alaxala Networks Corporation

Kensuke Ino

Ken Watanabe

Masaya Arai

Manabu Fujita

Shinji Nozaki

Hiroyuki Yoshino

A Provider Edge PEreplicates a received packet and relays these to virtual circuits VC, VCrespectively, and Provider Edges PE, PErespectively receive the packets from the virtual circuits VC, VC, whereupon the Provider Edges PE, PE, on the basis of an agreement between them, decide to handle the received packets such that one of the first edges relays the packet to a Customer Edge CEfor forwarding to a Host A, while the other edge discards the packet without relaying it to the Customer Edge CE

Data communication system and method for preventing packet proliferation in a multi-device link aggregation network

In a ring network including an old master node, a new master nodeis used as a replacement for the old master node. During replacement operation, when detecting that two ring ports of the new master nodeare set in link-up state, the new master nodegives a transit nodean instruction to forward a health check frame Hsent from a ring portof the old master nodeby a forwarding route going through the new master node. The new master nodecan monitor the status of the ring network by receiving the health check frame H. This configuration enables continuous monitoring for a failure occurring in the ring network during replacement of the master node.

Network device and network system

When the provider edge PEdetects the occurrence of a failure at the access line AL, it sends the label withdraw message to the virtual circuit VC, and when the provider edge PEreceives the label withdraw message sent via the virtual circuit VC, the access line ALis put to a link down state, and when the customer edge CEdetects the link down state of the access line AL, it switches from the normal path to the redundant path.

Data communication system, device and method of detecting a failure on an access line in a network

Data communication system and method for preventing packet proliferation in a multi-device link aggregate network

A Provider Edge PEreplicates a received packet and relays these to virtual circuits VC, VCrespectively, and Provider Edges PE, PErespectively receive the packets from the virtual circuits VC, VC, whereupon the Provider Edges PE, PE, on the basis of an agreement between them, decide to handle the received packets such that one of the edges relays the packet to a Customer Edge CEfor forwarding to a Host A, while the other edge discards the packet without relaying it to the Customer Edge CE

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Yokohama, Japan

Kensuke Ino