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IGMP means Internet Group Management Protocol. This protocol is used to establish and maintain multicast group membership between IP host and its directly adjacent multicast routers, but does not include the dissemination and maintenance of group membership information between multicast routers. This part of the work is completed by each group of broadcast routing protocols. All hosts participating in multicast must implement IGMP.PS: In order to facilitate everyone to see my update in time, I have set up a public number. In the future, the article will be published simultaneously with the public number and the blog park, so that everyone can receive the notice in time. If you don't understand any questions, you can also leave a message on the public number, so that I can see and reply in time. (The public number has just started to be done, and it is relatively rough. There is nothing in it = =, and it will be gradually improved in the later period ~ ~)心系国家的老党员罗秉文响应国家号召将儿子罗家明送往边疆参加支边建设。在支边期间罗家明认识了同为支边青年的科研人员沈湘玥，并帮助沈湘玥所在的科室研究出了新型化肥，大大提高了生产力。同时他在机械工程师宋思逸的影响下，心系祖国机械工业发展，组建了边疆的机械队伍，为边疆的机械化生产奠定了基础。在此过程中，罗家明与沈湘玥两人互相帮助、彼此欣赏，共同克服了种种困难，正当两人几经磨难眼看将要修成正果之际，却因为各自的理想而不能继续共事一处，风雨飘摇中，两人的命运将走向何处……HBO夏季新剧，巨石强森主演的#Ballers##球手#确定制作。该剧讲述了一群橄榄球员的职业生涯与私人生活。巨石强森在剧中出演一名退役的橄榄球员。0 When the CLR is running, the delegate DoSth is actually a class that has a constructor with a parameter type of method and provides an Invoke instance method to trigger the execution of the delegate.