Supervisory control plane over wavelength routed networks
View Patent ↗A dedicated IP-based wavelength routing/signaling control plane for optically switched network, is provided. The IP-based control plane is an out-band routing/signaling mechanism and does not require optical-electrical-optical (OEO) conversion. The control plane can accommodate the various network topologies of the data plane and if one of the supervisory, or control channel fails, the IP-based control plane can re-route the traffic to destination. Using non-broadcasting addressable protocols the control plane selects a different path to re-direct the control information without declaring the whole communications trail down and without affecting the client traffic over the data path.
1. A method for out-band routing of control messages to control all-optical networks, comprising the steps of:
establishing communications paths for customer traffic in an all-optical data plane network, said communications paths being associated with control channels for transmitting control messages over an IP-based, dedicated out-band control plane network, said IP-based, dedicated out-band control plane network being separate from said all-optical data plane network such that a topology of said IP-based, dedicated out-band control plane network is different from a topology of said data plane network, said control plane network including wavelength routing and signaling functions;
mapping said control channels from said IP-based, dedicated out-band control plane network to said all-optical data plane network, including creating a logical association between said topology of said IP-based, dedicated out-band control plane network and said topology of said data plane network; and
re-routing said control messages to a destination through an alternative control channel in said IP-based, dedicated out-band control plane network using non-broadcasting addressable protocols.
2. The method of claim 1 , wherein said mapping step includes setting up said topology of said IP-based, dedicated out-band control plane network with IP-based Layer-3 routing and signaling protocols, together with Layer-2 framing protocols in said IP-based, dedicated out-band network, and establishing said logical association between said topology of said IP-based, dedicated out-band control plane network and said topology of said all-optical data plane network.
3. The method of claim 1 , wherein said non-broadcasting addressable protocols comprising a wavelength routing protocol (WRP) for monitoring the status of wavelengths available on each link of said communications paths, and a wavelength distribution protocol (WDP) performing connections management according to combinations of destination addresses and service type information.
4. The method of claim 3 , wherein said wavelength routing protocol (WRP) is activated each time a change occurs in the all-optical network topology and in the bandwidth/wavelength availability.