Firstly. the proactive policy to ALM tree which is based on Chord DHT was extended and a back-path scheme with which each node pre-calculates a backup path for itself was proposed. When the non-leaf node leaves. all its child nodes can switch to the respective backup path immediately. https://www.bekindtopets.com/hot-offer-Solo-Jec-9-9-way-dog-vaccine-save-big/