--> Virtual Server Precedence in BIG IP F5 is used to select a virtual server when the inbound connection is matching more than one virtual server.
--> In order to select a particular virtual server, BIG IP F5 implements the algorithm in the following order,
i) Checks first Destination Address ( Virtual Server Address)
ii) Checks Source address if the destination address of all the virtual server is same
iii) Checks service port number in case of both destination address and the Source Address is the same.
--> If the destination address is the same on both the virtual servers but the subnet mask is different then in that case longest subnet mask is selected.
Ref: F5.Com (SOL K14800)
--> In order to select a particular virtual server, BIG IP F5 implements the algorithm in the following order,
i) Checks first Destination Address ( Virtual Server Address)
ii) Checks Source address if the destination address of all the virtual server is same
iii) Checks service port number in case of both destination address and the Source Address is the same.
--> If the destination address is the same on both the virtual servers but the subnet mask is different then in that case longest subnet mask is selected.
--> The source address field can be configured starting from F5 BIG IP Version 11.3, If you have an older version than 11.3 then it does not work.
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