Method and apparatus for fast reroute in a connection-oriented network

A method comprising:

• determining, by a first node, a failure of at least one of a second node or a link,
• the second node and the link being located downstream, along a first route, from the first node;
• determining, by the first node and based on the failure of the at least one of the second node or the link, that the first node does not store information regarding a second route;
• and
• transmitting, by the first node and based on determining that the first node does not store the information regarding the second route, a message to a third node,
• the third node being located upstream, along the first route, from the first node,
• the third node being different than the second node, and
• the message causing the third node to use the second route to forward packets intended for the first route,
• the second route being different than the first route.

A network node comprising:

• a processor to:
• receive information indicating a failure of at least one of a second network node or a link,
• the second network node and the link being located downstream, along a first route, from the network node;
• determine, based on the failure of the at least one of the second network node or the link, that the network node does not store information regarding a second route;
• and
• transmit, based on determining that the network node does not store the information regarding the second route, a message to a third network node,
• the third network node being located upstream, along the first route, from the network node,
• the third network node being different than the second network node, and
• the message causing the third network node to use the second route to forward packets intended for the first route,
• the second route being different than the first route.

A non-transitory computer-readable medium storing instructions, the instructions comprising:

• one or more instructions, which, when executed by a processor of a first node, cause the processor to:
• determine a failure of at least one of a second node or a link,
• the second node and the link being located downstream, along a first route, from the first node, and
• the first node not storing information regarding a second route;
• and
• transmit, based on the first node not storing the information regarding the second route, a message to a third node,
• the third node being located upstream, along the first route, from the first node,
• the third node being different than the second node, and
• the message causing the third node to use the second route to forward packets intended for the first route,
• the second route being different than the first route.