Modular scalable switch architecture
View Patent ↗A scalable Ethernet switch includes modules which can be interconnected to provide a single, virtual switch. The modules may be of uniform physical size and shape relative to a standard telecommunications rack. When greater capacity is required, an additional module is mounted in a rack and interconnected with the other modules, e.g., in a bi-directional ring. Enhanced port density is provided by interconnecting the modules with 12 GbE links which operate on standard 10 GbE wiring and connectors. Consequently, throughput between modules in increased relative to standard 10 GbE links without increasing form factor. Further, transmission power control can be implemented such that modules of the virtual switch may be physically adjacent or separated by distances of several meters.
1. A scalable network device comprising:
a plurality of modules, each module having:
at least one internal port arranged to operate at a non-standard line rate, the non-standard line rate internal ports being implemented with connectors rated at a line rate lower than the non-standard line rate such that a connector rating is exceeded during operation; and
at least one external port arranged to operate at a standard line rate, and
the internal ports are employed for communication between modules and the external ports are employed for communication with devices other than modules of the network device.
2. The device of claim 1 , wherein the modules are interconnected in a ring having at least first and second logical links arranged operate in opposing direction.
3. The device of claim 1 , wherein each module is independently capable of processing network traffic.
4. The device of claim 1 , wherein each of the modules has a chassis, and each chassis has the same dimensions.
5. The device of claim 1 , wherein the internal ports are backward compatible with a lesser standard line rate.
6. The device of claim 1 , further comprising cabling between module pairs, the cabling having lengths that differ between different module pairs.
7. The device of claim 6 , wherein each module includes at least one circuit element configured to set transmission power level on at least one internal port.
8. The device of claim 7 , wherein the at least one circuit element is configured in response to an indication of cabling length to select a transmission power level.
9. A method for scaling capacity of a network device, the method, comprising:
adding modules to the network device to scale the capacity of the network device, each module having:
at least one internal port arranged to operate at a non-standard line rate, the non-standard line rate internal ports being implemented with connectors rated at a line rate lower than the non-standard line rate such that a connector rating is exceeded during operation; and
at least one external port arranged to operate at a standard line rate, and
the internal ports are employed for communication between modules and the external ports are employed for communication with devices other than modules of the network device.
10. The method of claim 9 , further comprising interconnecting the modules in a ring having at least first and second logical links operable in opposing direction.
11. The method of claim 9 , wherein each module is independently capable of processing traffic.
12. The method of claim 9 , wherein each of the modules has a chassis, and each chassis has the same dimensions.
13. The method of claim 9 , wherein the internal ports are backward-compatible with a lesser standard line rate.
14. The method of claim 9 , wherein cabling between modules has different lengths between different module pairs.
15. The method of claim 14 , further comprising setting a transmission power level on at least one internal port.
16. The method of claim 15 , comprising selecting a transmission power level in response to an indication of cabling length.