Adaptive routing using inter-switch notifications

A network switch, comprising:

• multiple ports, which are configured to communicate with a communication network;
• and
• switching circuitry, which is configured to receive communication traffic that originates from a source node and arrives over a route through the communication network traversing one or more preceding network switches, for forwarding to a destination node, and, in response to detecting a compromised ability to forward the communication traffic to the destination node, sending to the preceding network switches a notification, which is to be consumed by the preceding network switches and requests the preceding network switches to modify the route so as not to traverse the network switch.

A network switch, comprising:

• multiple ports, which are configured to communicate with a communication network;
• and
• switching circuitry, which is configured to receive communication traffic that originates from a source node and arrives over a route through the communication network, to forward the traffic to a destination node via a downstream network switch, to receive from the downstream network switch a notification that indicates a compromised ability of the downstream network switch to forward the communication traffic to the destination node, and, in response to the notification, to modify the route so as not to traverse the downstream network switch.