CROSS-DOMAIN PARALLEL RECOVERING METHOD AND SYSTEM IN MULTI-LAYER AND MULTI-DOMAIN DISTRIBUTED OPTICAL NETWORK
First Claim
1. A method to restore parallel cross-domain faults in multi-layer and multi-domain distributed optical network (MMDON), the method compromising:
- A. Establishing loose inter-domain recovery paths (RPs) between adjacent domains among working paths (WPs) on routing devices when establishing WPs for links that span multiple recovery domains and call for a service recovery.The inter-domain loose recovery paths (LRPs) claimed are the recovery paths that connect local domain and downstream domain. They are calculated in due manners;
according to the link-state information provided by inter-domain flow database, and in the premises that downstream domains which are adjacent to local domains along the working paths are abstracted into target nodes, open shortest path first (OSPF) algorithm and topology method are utilized for the calculation.B. Realizing parallel cross-domain path recovery based on MMDON in due process;
When a fault is detected on the inter-domain links, an inter-domain LRP establishing operation is called by the original domain of failing links to inform domains that pass through the inter-domain LRP. In the mean while, a parallel mechanism to build up LRPs is called.
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Abstract
Provided is a cross-domain parallel recovering method and system in multi-layer and multi-domain distributed optical network (MMDON). Based on inter-domain LRA (Link Recovery Algorithm), the routing devices establish inter-domain WP (Work Path) and then build inter-domain RP (Recovery Path) based on WP. Inter-domain RPs will be established by using PSM (Parallel Signaling Mechanism) when link failure occurs on inter-domain WPs. That realizes the establishments and of inter-domain RP, and improves the survivability of inter-domain services. Inter-domain RPs are established or engaged before the establishing of WPs, while the intra-domain paths are established after the failure testing. This mechanism ensures the availability of inter-domain resources during recovery and avoids resource waste caused by pre-establishing intra-domain RPs. Moreover, parallel signaling mechanism can decrease the recovery time, and can handle inter-domain link failures simultaneously to avoid queue-waiting.
23 Citations
10 Claims
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1. A method to restore parallel cross-domain faults in multi-layer and multi-domain distributed optical network (MMDON), the method compromising:
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A. Establishing loose inter-domain recovery paths (RPs) between adjacent domains among working paths (WPs) on routing devices when establishing WPs for links that span multiple recovery domains and call for a service recovery. The inter-domain loose recovery paths (LRPs) claimed are the recovery paths that connect local domain and downstream domain. They are calculated in due manners;
according to the link-state information provided by inter-domain flow database, and in the premises that downstream domains which are adjacent to local domains along the working paths are abstracted into target nodes, open shortest path first (OSPF) algorithm and topology method are utilized for the calculation.B. Realizing parallel cross-domain path recovery based on MMDON in due process;
When a fault is detected on the inter-domain links, an inter-domain LRP establishing operation is called by the original domain of failing links to inform domains that pass through the inter-domain LRP. In the mean while, a parallel mechanism to build up LRPs is called. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification