Circuit emulation over an IP interworking VLL
A method of circuit emulation over an IP interworking VLL, and related system, the method including one or more of the following: configuring a circuit emulation port with one or more logical interfaces; configuring one or more channels on each of the one or more logical interfaces; configuring the one or more channels with a destination IP address; configuring the one or more channels with a destination UDP port number; specifying an Ipipe VLL for each of the one or more channels; determining TDM traffic to go onto the specified Ipipe; packetizing TDM traffic; encapsulating the TDM traffic with encapsulation; inserting one or more packets of the TDM traffic into an IP interworking VLL; sending the one or more packets through the Ipipe; stripping the encapsulation from the one or more packets of the TDM traffic; and forwarding the one or more packets to a destination.
1. A method of circuit emulation over an Internet Protocol (IP) interworking Virtual Leased Line (VLL) to enable a circuit emulation port having non-Ethernet technology to connect to an Ethernet port, the method comprising:
configuring the circuit emulation port with one or more logical interfaces;
configuring one or more channels on each of the one or more logical interfaces;
configuring the one or more channels with a destination IP address;
configuring the one or more channels with a destination User Datagram Protocol (UDP) port number;
specifying an Ipipe VLL for each of the one or more channels;
determining Time Division Multiplexed (TDM) traffic to go onto the specified Ipipe;
packetizing TDM traffic;
encapsulating the TDM traffic with encapsulation;
inserting one or more packets of the TDM traffic into the IP interworking VLL;
sending the one or more packets through the Ipipe;
stripping the encapsulation from the one or more packets of the TDM traffic;
generating an Address Resolution Protocol (ARP) request, wherein the ARP request specifies a circuit emulation device as a destination and an IP address of the circuit emulation port as a source; and
forwarding the one or more packets from the Ethernet port to an IP destination.
2. The method of circuit emulation over the IP interworking VLL, according to claim 1 , wherein each of the one or more logical interfaces has a unique IP address.
3. The method of circuit emulation over the IP interworking VLL, according to claim 1 , wherein encapsulating the TDM traffic includes encapsulating the TDM traffic with an IP header.
4. The method of circuit emulation over the IP interworking VLL, according to claim 3 , wherein encapsulating the TDM traffic includes encapsulating the TDM traffic with the destination IP address, the destination UDP port number, the source IP address, and a UDP port number corresponding to the one or more channels.
5. The method of circuit emulation over the IP interworking VLL, according to claim 1 , further comprising:
performing a special lookup wherein a combination of the destination IP address and the UDP port number results in a determination of the IP interworking VLL in which to insert the one or more packets.
6. The method of circuit emulation over the IP interworking VLL, according to claim 1 , wherein the TDM traffic is encapsulated with MPLS encapsulation.
7. The method of circuit emulation over the IP interworking VLL, according to claim 1 , wherein the Ipipe carries circuit emulation traffic for only one destination IP address and only one destination UDP port, further comprising:
tracking the destination UDP port associated with each Ipipe for a given destination IP address.
8. The method of circuit emulation over the IP interworking VLL, according to claim 7 , further comprising:
performing the tracking with an ARP cache.
9. A system for circuit emulation (CEM) over an IP interworking VLL to enable CEM ports having non-Ethernet technology to connect to Ethernet ports, the system comprising:
a source that generates one or more packets for transmission;
a first communication path that transmits the one or more packets from the source;
a first CEM port having one or more logical interfaces that receives the one or more packets from the source, each of the one or more logical interfaces having one or more channels, and each of the one or more channels configured with a destination IP address and UDP port number;
an IP/MPLS network cloud having an IP pseudo-wire Ipipe that receives packetized and encapsulated traffic, including the one or more packets, from the source and transmits forward the packetized and encapsulated traffic; and
a second CEM port that receives the packetized and encapsulated traffic, strips the encapsulation from the one or more packets, and forwards the one or more packets from an Ethernet port to a destination, wherein an ARP request specifies a circuit emulation device as a destination and an IP address of the second CEM port as a source.
10. The system for circuit emulation over the IP interworking VLL, according to claim 9 , further comprising:
a second communications path that forwards the one or more packets to the destination: and
a destination that receives the one or more packets.