4. Load
Balancing Terminology
Ø
Nodes
- The devices represented by the IP address of Pool Member are called Nodes. Hence Node has only IP address & may represent in many pool members. ( IP Address )
Ø Pool
Members
- A pool member is an IP address and service port combination that is hosted by physical server.
- A single server can host any number of pool member because the different service ports may run various services. ( IP Address:Port )
Ø Pools
- A pool is a group of pool member and is identified by name. In addition to pools member, pools also have their own load balancing method, monitors and other feature.
Ø Virtual
Servers
- A virtual Server is a combination of Virtual IP address & service Port
- Virtual Server is mapped with multiple actual server or pools.
- Virtual Server will perform multiple functions like: Server availability Load Balancing, translation of virtual IP address to actual IP address, Translate virtual server service ports to actual server service ports.
- By default translation of address & ports are enabled in virtual server.
Ø
Packet Flow through BIG IP :
ü
Client initiate request to BIG IP Virtual Server
IP address & Service Port
ü
BIP IP translate VIP to actual IP address
ü
Server will see Client IP address as a source
& own IP address in destination
ü
Server will reply to that session & BIG IP
will translate back server actual IP to VIP address
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