Sir, Thanks for previous helps! I still have a question about the durable subscriber in the routing network. If I have such a routing network consisted by four routers (A, B, C and D) like : Publisher X---- A----------------B \ / \ / C----------D-------Durable Subscriber Y (1)The problem is that how the messages published by X will be routed to Y? Because I think the message routing procedure involves "store and forward", what will happen if Y is offline during the message propogation? I mean whether there are several duplicates of the messges stored in the routing network? (2) When the Y reconnects to the routing networking, it is reasobable for it to choose to connect to router B. Under this situation, how will the previous messages be delieved to Y? And where the previous message is stored (router A, B, C or D)? (3)For the above situation, I want to know the failure of which router is fatal? I mean its failure will lead to the failure of message delieving (Don't consider the routes, I assume there are enough routes to the destination). Thanks a lot! yangyuexiang ------------------------------------------------------ SwiftMQ developers mailing list * http://www.swiftmq.com To unsubscribe from this list, send an eMail to [EMAIL PROTECTED] and write in the body of your message: UNSUBSCRIBE developers <your-email-address> Archive: http://www.mail-archive.com/developers@mail.iit.de/