US 10,368,150 B1Granted

Carrying high capacity bit transparent leased line services over internet protocol/multiprotocol label switching networks

AssigneeFujitsu Limited

InventorsBiaodong Cai, Rod Naphan, Richard Dunsmore

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Abstract

Methods and systems of a leased line appliance (LLA) network switching system that includes using LLAs for leased line circuits (LLCs) to Internet Protocol (IP) transceiving, IP to LLCs transceiving, and an IP switch fabric having multiple parallel paths as a switching/routing network are disclosed. Each of the LLAs at the edge of the IP switch fabric may perform LLC to IP packet assembly procedures, may perform IP packet to LLC re-assembly procedures, and may utilize the protocol fields of the IP packet header of the IP packet for IP packet transport, which may enable the transport of very high speed leased line services to be carried over an IP/MPLS network using the IP switch fabric.

Claims20

Dependent claims

A leased line appliance (LLA) network switching system comprising:

an Internet Protocol (IP) switch fabric including M parallel paths;
a first LLA coupled to a first set of leased lines and coupled to the IP switch fabric to:
receive first leased line circuits (LLCs) over a first leased line of the first set of leased lines;
convert the first LLCs to first optical data unit (ODU) cells;
map the first ODU cells into first Internet Protocol (IP) packets using user datagram protocol (UDP), each of the first IP packets having a corresponding header comprising a UDP source port number including a PCS code block ID source, a UDP destination port number including a PCS code block ID destination, a sequence number, and a timestamp;
and
transmit each of the first IP packets over the IP switch fabric via a respective parallel path of the M parallel paths corresponding to each of the first IP packets;
and
a second LLA coupled to a second set of leased lines and coupled to the IP switch fabric to:
receive each of the first IP packets over the IP switch fabric via the parallel path of the M parallel paths corresponding to each of the first IP packets;
de-map the first IP packets into the first ODU cells based on each corresponding header of each of the first IP packets;
convert the first ODU cells to the first LLCs;
and
transmit the first LLCs over a second leased line of the second set of leased lines.

11 more elements

A method comprising:

receiving, by a first leased line appliance (LLA) of a LLA network switching system, first leased line circuits (LLCs) over a first leased line of a first set of leased lines of the LLA network switching system;
converting, by the first LLA, the first LLCs to first optical data unit (ODU) cells;
mapping, by the first LLA, the first ODU cells into first Internet Protocol (IP) packets using user datagram protocol (UDP), each of the first IP packets having a corresponding header comprising a UDP source port number including an ODU identification (ID) source, a UDP destination port number including an ODU ID destination, a sequence number, and a timestamp;
transmitting, by the first LLA, each of the first IP packets over an IP switch fabric of the LLA network switching system via a respective parallel path of M parallel paths of the IP switch fabric corresponding to each of the first IP packets;
receiving, by a second LLA of the LLA network switching system, each of the first IP packets over the IP switch fabric via the parallel path of the M parallel paths corresponding to each of the first IP packets;
de-mapping, by the second LLA, the first IP packets into the first ODU cells based on each corresponding header of each of the first IP packets;
converting, by the second LLA, the first ODU cells to the first LLCs;
and
transmitting, by the second LLA, the first LLCs over a second leased line of a second set of leased lines of the LLA network switching system.

6 more elements

Dependencies are inferred from the claim text.