set of vertices representing the network nodes set of arcs representing network directed links set of anycast connections(requests) in the network.(只要客戶的請(qǐng)求能通過某個(gè)路徑到達(dá)網(wǎng)絡(luò)中的任何一個(gè)servers就說這個(gè)anycast connection能被建立) set of candidate paths of anycast request the index set of candidate routes(paths) for anycast connection , 包含了該anycast connection 的client到網(wǎng)絡(luò)中所有servers的全部可能路徑的索引烁设。 A route selection set. 指示出了當(dāng)前為所有anycast requests所選的routes蚯撩，犬金，只包含binary variable中取值為1的那些。
Constants
=1乡翅，if arc belongs to route realizing connection ; 0 otherwise. estimated bandwidth requirement of connection . 用向量表示所有anycast requests的bandwidth requirements。 capacity of arc a. total message arrival rate (message/s)
Variables
=1, if route having index is selected for connection ; 0 otherwise. flow of arc a.
