| 摘要 |
A u-turn fast rerouting capability is depicted and described herein. A packet that is intended for a destination node is propagated from a first node toward a second node. The first node propagates the packet toward the second node based on selection of a first routing path for routing the packet from the first node toward the destination node. The second node, upon receiving the packet, determines that the packet cannot be delivered to the destination node via the first routing path. The second node inserts a u-turn label into the packet and returns the packet to the first node. The u-turn label indicates to the first node that the packet is being returned to the first node by the second node due to a condition preventing propagation of the packet toward the destination node using the first routing path. The first node, upon receiving the packet including the u-turn label, then selects a second routing path for routing the packet toward the destination node and propagates the packet toward the destination node based on the second routing path. The u-turn fast rerouting capability enables fast rerouting of packets in a manner preventing dropping of packets and preventing formation of forwarding loops. |
