Connectivity fault management in a communication network
Methods and apparatus are disclosed for monitoring a Maintenance Association (MA) for Connectivity Fault Management (CFM) in a network supporting Equal Cost Multiple Paths (ECMP). A set of ECMP paths is generated for sending data between endpoints in the network. Furthermore, a set of ECMP MAs is created that are used for monitoring the generated ECMP paths between the endpoints. The created set of ECMP MAs is subsequently used for sending monitoring packets. ECMP path MAs therefore conform to existing CFM operation and are compatible with both ECMP point to point path MAs and ECMP multipoint path MAs.
1. A method of monitoring a Maintenance Association for Connectivity Fault Management in a network supporting Equal Cost Multiple Paths, ECMP, the method comprising:
generating a set of ECMP multipoint paths for sending data between endpoints in the network, the ECMP multipoint paths comprising a set of connectivity multipoint paths along the same endpoints, each ECMP multipoint path of the set of ECMP multipoint paths having N endpoints and being identified using a Group address;
creating a set of ECMP Maintenance Associations for monitoring the generated ECMP multipoint paths between the endpoints; and
using the created set of ECMP Maintenance Associations for sending monitoring packets.
2. The method according to claim 1 , wherein each monitoring packet comprises a Connectivity Fault Management Protocol Data Unit.
3. The method according to claim 1 , wherein the Group address is a Group MAC address.
4. The method according to claim 3 , further comprising constructing the Group MAC address by applying an operation on Backbone Service Identifier values associated with the ECMP multipoint paths.
5. The method according to claim 4 , further comprising monitoring one or more of the ECMP multipoint paths by sending the monitored packet using the Backbone Service Identifier value associated with the one or more monitored ECMP multipoint paths.
6. The method according to claim 5 , wherein the identifier is selected from any of a Flow Hash and a Group MAC address identifying the path.
7. The method according to claim 1 , further comprising monitoring a plurality of ECMP multipoint paths by sending monitored packets in groups cyclically on each monitored ECMP multipoint path, using the identifier associated with each monitored ECMP path.
8. A non-transitory computer readable medium which, when run on a node, causes the node to perform the method of claim 1 .
9. A node for use in a communications network supporting Equal Cost Multiple Paths, ECMP, the node comprising:
a processor for generating a set of ECMP multipoint path for sending data between end points, the ECMP multipoint paths comprising a set of connectivity multipoint paths along the same endpoints, each ECMP multipoint path of the set of ECMP multipoint paths having N endpoints and being identified using a Group address;
the processor being further arranged to create a set of ECMP Maintenance Associations for monitoring the generated ECMP multipoint paths between the endpoints; and
a transmitter for sending monitoring packets using the set of generated ECMP multipoint paths.
10. The node according to claim 9 , wherein the processor is arranged to identify an ECMP multipoint path monitoring packet using a Group MAC address for each multipoint ECMP path.
11. The node according to claim 10 , wherein the processor is arranged to construct each Group MAC address by applying an operation on Backbone Service Identifier values associated with the ECMP multipoint paths.
12. A vessel or vehicle comprising the node as claimed in claim 9 .
13. A node for use in a communications network supporting Equal Cost Multiple Paths, ECMP, the node comprising:
a processor for generating a set of ECMP multipoint path for sending data between end points, the ECMP multipoint paths comprising a set of connectivity multipoint paths along the same endpoints, each ECMP multipoint path of the set of ECMP multipoint paths comprising an ECMP multipoint path having N endpoints and being identified using a Group address;
the processor being further arranged to create a set of ECMP Maintenance Associations for monitoring the generated ECMP multipoint paths between the endpoints;
a transmitter for sending monitoring packets using the set of generated ECMP multipoint paths; and
a computer readable medium in the form of a memory for storing information mapping at least one Service Identifier to each generated ECMP multipoint path.