Method for Adjacency Status Synchronization in Label Distribution Protocol
A method for providing LDP Hello Adjacency status synchronization between peers is disclosed. The method for providing LDP Hello Adjacency status synchronization between peers includes generating, by a first packet-switched network node, a Hello Adjacency Status type-length-value (TLV) comprising adjacency status specific data, wherein the Hello Adjacency Status TLV comprises an unknown (U) bit, a forwarding (F) bit, a type field indicating a Hello Adjacency Status type, a length field, and a status data field comprising the status specific data, wherein the status specific data comprises information about Hello Adjacency status; and transmitting, by the first packet-switched network node, the Hello Adjacency Status TLV to a second packet-switched network node. The method for providing LDP Hello Adjacency status synchronization between peers provides recovery advantages over systems known in the art by providing capability for a peer to receive information on the loss of Hello Adjacency from another peer.
1 . A method for Label Distribution Protocol (LDP) Hello Adjacency status synchronization, the method comprising:
generating, by a first packet-switched network node, a Hello Adjacency Status type-length-value (TLV) comprising adjacency status specific data, wherein the Hello Adjacency Status TLV comprises an unknown (U) bit, a forwarding (F) bit, a type field indicating a Hello Adjacency Status type, a length field, and a status data field comprising the status specific data, wherein the status specific data comprises information about Hello Adjacency status, the U bit indicates how to respond to an unknown received TLV, the F bit indicates whether to forward the unknown received TLV, and the length field indicates a length of the Hello Adjacency Status TLV; and
transmitting, by the first packet-switched network node, the Hello Adjacency Status TLV to a second packet-switched network node.
2 . The method of claim 1 , wherein the Hello Adjacency Status TLV is included within an LDP Hello Status message.
3 . The method of claim 2 , wherein the LDP Hello Status message is sent from an ingress node to a transit node.
4 . The method of claim 2 , wherein the LDP Hello Status message is sent from a first transit node to a second transit node.
5 . The method of claim 2 , wherein the status data field further comprises an Adjacency Status Code field; a Sender Interface ID field; a Sender Sequence Number field; a Receiver Interface ID field; and a Receiver Sequence Number field.
6 . The method of claim 2 , wherein the U bit comprises a value of one; and the F bit comprises a value of zero; in the case when the Hello Adjacency Status TLV is included within an LDP Hello Status message.
7 . The method of claim 2 , wherein the Hello Adjacency Status TLV further comprises a Vendor_OUI field.
8 . An apparatus for Label Distribution Protocol (LDP) Hello Adjacency status synchronization, the apparatus comprising:
a processor; and
a tangible and non-transitory computer readable storage medium storing programming for execution by the processor, the programming including instructions to:
communicate a Hello Adjacency Status type-length-value (TLV) comprising adjacency status specific data, wherein the Hello Adjacency Status TLV comprises an unknown (U) bit, a forwarding (F) bit, a type field indicating a Hello Adjacency Status type, a length field, and a status data field comprising the status specific data, wherein the status specific data comprises information about Hello Adjacency status, the U bit indicates how to respond to an unknown received TLV, the F bit indicates whether to forward the unknown received TLV, and the length field indicates a length of the Hello Adjacency Status TLV.
9 . The apparatus of claim 8 , wherein the Hello Adjacency Status TLV is communicated within an LDP Hello Status message.
10 . The apparatus of claim 9 , wherein the LDP Hello Status message is sent to a transit node.
11 . The apparatus of claim 9 , wherein the status data field further comprises an Adjacency Status Code field; a Sender Interface ID field; a Sender Sequence Number field; a Receiver Interface ID field; and a Receiver Sequence Number field.
12 . The apparatus of claim 9 , wherein the U bit comprises a value of one; and the F bit comprises a value of zero; in the case when the Hello Adjacency Status TLV is included within an LDP Hello Status message.
13 . The apparatus of claim 9 , wherein the Hello Adjacency Status TLV further comprises a Vendor_OUI field.
14 . A method for Label Distribution Protocol (LDP) Hello Adjacency status synchronization, the method comprising:
receiving, a second packet-switched network node from by a first packet-switched network node, a Hello Adjacency Status type-length-value (TLV) comprising adjacency status specific data, wherein the Hello Adjacency Status TLV comprises an unknown (U) bit, a forwarding (F) bit, a type field indicating a Hello Adjacency Status type, a length field, and a status data field comprising the status specific data, wherein the status specific data comprises information about Hello Adjacency status, the U bit indicates how to respond to an unknown received TLV, the F bit indicates whether to forward the unknown received TLV, and the length field indicates a length of the Hello Adjacency Status TLV; and
decoding, by the second packet-switched network node, the Hello Adjacency status.
15 . The method of claim 14 , wherein the Hello Adjacency Status TLV is included within an LDP Hello Status message.
16 . The method of claim 15 , wherein the LDP Hello Status message is received at a transit node from an ingress node.
17 . The method of claim 15 , wherein the LDP Hello Status message is received at a second transit node from a first transit node.
18 . The method of claim 15 , wherein the status data field further comprises an Adjacency Status Code field; a Sender Interface ID field; a Sender Sequence Number field; a Receiver Interface ID field; and a Receiver Sequence Number field.
19 . The method of claim 15 , wherein the U bit comprises a value of one; and the F bit comprises a value of zero; in the case when the Hello Adjacency Status TLV is included within an LDP Hello Status message.
20 . The method of claim 15 , wherein the Hello Adjacency Status TLV further comprises a Vendor_OUI field.