Communication resilience in a network
Methods and systems for resilient network communication are provided. In one aspect, a network includes multiple edge network elements, core network elements, and off-network network elements. Each network element has multiple ports. Communication paths exist between edge network elements, traversing core network elements. A maintenance domain maintains communication resiliency in the network through maintenance domain entities that detect network communication faults. Maintenance domain entities are associated with ports of edge network elements. VLAN service provision to subscribers occurs over the network by mapping services to VLAN tags such that the service VLAN includes information about the resilient network. VLAN service assignment to maintenance domains is balanced.
1. A method for communication resilience comprising:
assigning a unicast service to a protection group, wherein the protection group comprises an active communication path and a standby communication path between a service provider network element and a subscriber network element;
associating with a unicast service virtual local area network (“VLAN”) packet a tag, wherein the tag identifies the unicast service VLAN packet as a member of the unicast service VLAN;
encoding the tag with information for switching traffic from a service provider to a subscriber, wherein the tag uniquely identifies the subscriber, the service provider, the subscriber network element, the service provider network element, a port of the subscriber network element, and a maintenance domain;
detecting a network failure along a path between the service provider and the subscriber;
in response to detecting the network failure, switching to a protection path of the maintenance domain using the information encoded in the tag.
2. The method of claim 1 , wherein the tag comprises an outer tag and an inner tag.
3. The method of claim 2 , wherein encoding the tag further comprises:
encoding the outer tag with information for switching traffic across a core network element between a subscriber network element and a service provider network element; and
encoding the inner tag with information for switching traffic between the subscriber network element and the subscriber.
4. The method of claim 1 , wherein assigning a unicast service to a protection group includes assigning a class and a weight to the unicast service.
5. The method of claim 1 , wherein assigning a unicast service to a protection group further comprises balancing weight and class of unicast services at ports of the service provider network element.
6. The method of claim 5 , wherein balancing comprises a round robin algorithm.
7. The method of claim 5 , wherein balancing comprises a minimum peak information rate (“PIR”) algorithm.
8. The method of claim 5 , wherein balancing comprises a minimum committed information rate (“CIR”) algorithm.
9. The method of claim 5 , wherein assigning a unicast service to a protection group further comprises balancing the weight and class of services at the ports of the subscriber network.