Node, a monitoring management method used for a node, and a transfer system, an input circuit and an output circuit

A node which transmits and receives an OAM (Operation Administration and Maintenance) frame including TTL (Time To Live), comprising:

• an input unit which receives an OAM frame from outside of a device;
• and
• an output unit which transmits an OAM frame to another device connected outside of a said device, wherein
• said input unit sets TTL of an OAM frame received from outside to a specific value which shows that a termination destination is said output unit and transmits said received OAM frame to said output unit;
• and
• said output unit detects a value of TTL of an OAM frame received from said input unit and terminates an OAM frame including TTL of said specific value.

A transfer system including a plurality of nodes in an MPLS (Multi Protocol Label Switching) network, an output unit of one of said plurality of nodes and an input unit of another of said plurality of nodes being connected, each of said plurality of nodes comprising:

• said input unit which receives an OAM (Operation Administration and Maintenance) frame including TTL (Time To Live) from outside of the node;
• and
• said output unit which transmits an OAM frame to another node from among the plurality of nodes connected outside of the node, wherein
• said input unit, in case where said node is destination of the received OAM frame, sets said TTL to a specific value and transmits said received OAM frame to said output unit;
• and
• said output unit terminates an OAM frame transmitted from said input unit.

A node in an MPLS (Multi Protocol Label Switching) network, comprising:

• input means for receiving an OAM (Operation Administration and Maintenance) frame including TTL (Time To Live) from outside of the node;
• and
• output means for transmitting an OAM frame to outside of the node, wherein:
• said input means sets said TTL to a specific value and transmits said received OAM frame to said output means in case where said node is destination of said received OAM frame;
• and
• said output means terminates an OAM frame transmitted from said input means.

A node which transmits and receives an OAM (Operation Administration and Maintenance) frame including TTL (Time To Live), comprising:

• input means for receiving an OAM frame from outside of a device;
• and
• output means for transmitting an OAM frame to outside of a device, wherein
• said input means sets TTL of an OAM frame received from outside to a specific value which shows that a termination destination is said output means and transmits said received OAM frame to said output means;
• and
• said output means detects a value of TTL of an OAM frame received from said input means and terminates an OAM frame including TTL of said specific value.

A transfer system including a plurality of nodes in an MPLS (Multi Protocol Label Switching) network, an output unit of one of said plurality of nodes and an input unit another of said plurality of nodes being connected, each of said plurality of nodes comprising:

• said input means for receiving an OAM (Operation Administration and Maintenance) frame including TTL (Time To Live) from outside of the node;
• and
• said output means for transmitting an OAM frame to another node from among the plurality of nodes connected outside of the node, wherein
• said input means, in case where said node is destination of said received OAM frame, sets said TTL to a specific value and transmits said received OAM frame to said output means;
• and
• said output means terminates an OAM frame transmitted from said input means.