Method, apparatus, and system for detecting multi-protocol label switching ring network

A method for detecting a multi-protocol label switching ring network, comprising:

• initiating, by a ring ingress node, a fault detection request packet with incremental time to live (TTL);
• determining a ring label switched path (LSP) forwarding equivalence class (FEC) corresponding to the fault detection request packet, and encapsulating the ring LSP FEC into the fault detection request packet;
• respectively sending the fault detection request packet after encapsulation with the incremental TTL to downstream nodes, wherein the downstream nodes comprise all intermediate nodes between the ring ingress node and the ring egress node;
• and
• if no fault detection reply packet returned by a downstream node is received, determining that the downstream node is a faulty node.

An apparatus for detecting a multi-protocol label switching ring network, comprising:

• an initiating module, configured to initiate a detection request packet;
• a encapsulating module, configured to determine a ring label switched path (LSP) forwarding equivalence class (FEC) corresponding to the detection request packet, and encapsulate the ring LSP FEC into the detection request packet;
• a sending module, configured to send the detection request packet after encapsulation to a ring egress node;
• and
• a detecting module, configured to determine whether a detection reply packet sent by the ring egress node is received;
• if the detection reply packet sent by the ring egress node is received, determine that the ring LSP is connected;
• if the detection reply packet sent by the ring egress node is not received, determine that a ring LSP corresponding to the ring LSP FEC is not connected.

An apparatus for detecting a multi-protocol label switching ring network, comprising:

• an initiating module, configured to initiate a fault detection request packet with incremental time to live (TTL);
• an encapsulating module, configured to determine a ring label switched path (LSP) forwarding equivalence class (FEC) corresponding to the fault detection request packet, and encapsulate the ring LSP FEC into the fault detection request packet;
• a sending module, configured to respectively send the fault detection request packet after the encapsulation with the incremental TTL to downstream nodes, wherein the downstream nodes comprise all intermediate nodes between a ring ingress node and a ring egress node;
• and
• a detecting module, configured to:
• if no fault detection reply packet returned by a downstream node is received, determine that the downstream node is a faulty node.

A system for detecting a multi-protocol label switching ring network, comprising:

• a ring ingress node, and a ring egress node that communicates with the ring ingress node;
• wherein, the ring ingress node comprises an apparatus for detecting the multi-protocol label switching ring network,
• the apparatus comprises:
• an initiating module, configured to initiate a detection request packet;
• an encapsulating module, configured to determine a ring label switched path (LSP) forwarding equivalence class (FEC) corresponding to the detection request packet, and encapsulate the ring LSP FEC into the detection request packet;
• a sending module, configured to send the detection request packet after encapsulation to a ring egress node;
• and
• a detecting module, configured to determine whether a detection reply packet sent by the ring egress node is received;
• if the detection reply packet sent by the ring egress node is received, determine that a ring LSP corresponding to the ring LSP FEC is connected;
• if the detection reply packet sent by the ring egress node is not received, determine that the ring LSP is not connected;
• and
• the ring egress node is configured to:
• receive a detection request packet after the encapsulation sent by the ring ingress node, and determine, according to a ring identity comprised in the ring LSP FEC, whether a ring LSP along a ring direction between the ring ingress node and the ring egress node corresponds to the ring identity;
• if the ring LSP along the ring direction between the ring ingress node and the ring egress node corresponds to the ring identity, further determine, according to a ring egress node address comprised in the ring LSP FEC, whether the ring egress node corresponds to the ring egress node address;
• if the ring egress node corresponds to the ring egress node address, encapsulate the ring LSP FEC into a detection reply packet, and send the detection reply packet after the encapsulation to the ring ingress node.

A system for detecting a multi-protocol label switching ring network, comprising:

• a ring ingress node, a ring egress node that communicates with the ring ingress node, and all intermediate nodes along a ring direction between the ring ingress node and the ring egress node;
• wherein, the ring ingress node comprises an apparatus for detecting the multi-protocol label switching ring network,
• the apparatus comprises:
• an initiating module, configured to initiate a fault detection request packet with incremental time to live (TTL);
• an encapsulating module, configured to determine a ring label switched path (LSP) forwarding equivalence class (FEC) corresponding to the fault detection request packet, and encapsulate the ring LSP FEC into the fault detection request packet;
• a sending module, configured to respectively send the fault detection request packet after the encapsulation with the incremental TTL to downstream nodes, wherein the downstream nodes comprise all intermediate nodes between a ring ingress node and a ring egress node;
• and
• a detecting module, configured to:
• if no fault detection reply packet returned by a downstream node is received, determine that the downstream node is a faulty node ;
• the intermediate nodes are configured to:
• receive a fault detection request packet after the encapsulation with the incremental TTL sent by the ring ingress node, and determine, according to a ring identity comprised in the ring LSP FEC, whether a ring LSP along a ring direction between the ring ingress node and the ring egress node corresponds to the ring identity;
• if the ring LSP along the ring direction between the ring ingress node and the ring egress node corresponds to the ring identity, encapsulate the ring LSP FEC and downstream node information of the intermediate nodes into a fault detection reply packet, and send the fault detection reply packet after the encapsulation to the ring ingress node;
• and
• the ring egress node is configured to:
• receive the fault detection request packet after the encapsulation sent by the ring ingress node, and determine, according to the ring identity comprised in the ring LSP FEC, whether the ring LSP along the ring direction between the ring ingress node and the ring egress node corresponds to the ring identity;
• if the ring LSP along the ring direction between the ring ingress node and the ring egress node corresponds to the ring identity, further determine, according to a ring egress node address comprised in the ring LSP FEC, whether the ring egress node corresponds to the ring egress node address;
• if the ring egress node corresponds to the ring egress node address, encapsulate the ring LSP FEC into the fault detection reply packet, and send the fault detection reply packet after the encapsulation to the ring ingress node.