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Chapter 4: Configuring the High-Level Network
4-2
Pools
A load balancing pool is the primary object in the high-level network. A
pool is a set of devices grouped together to receive traffic according to a
load balancing method. When you create a pool, the members of the pool
become visible nodes on the high-level network and can acquire the various
properties that attach to nodes. Pools can be accessed through a virtual
server, either directly or through a rule, which chooses among two or more
pools. The Rules section of this chapter describes several ways to select
pools using rules.
You can use the Configuration utility or the bigpipe pool command to
create, delete, modify, or display the pool definitions on the BIG-IP.
When creating a pool, you can configure various pool attributes. Table 4.1
lists the attributes you can configure for a pool.
Pool Attributes Description Required or Optional?
Pool name You can define the name of the pool. Required
Member
specification
You can define each network device, or node, that is a member of
the pool.
Required for
non-forwarding pools
Load balancing
method
You can define a specific load balancing mode for a pool, and you
can configure priority-based member activation. Various pools can
be configured with different load balancing modes.
Required
(Default=Round Robin)
Persistence
method
You can define a specific persistence method for a pool. You can
have various pools configured with different persistence methods.
Optional
HTTP redirection You can redirect HTTP requests to a fallback host, protocol, port, or
URI path.
Optional
HTTP header
insertion
You can configure a pool to insert a header into an HTTP request.
For example, the header could include an original client IP address,
to preserve the address during a SNAT connection.
Optional
Quality of Service
(QoS) level
You can configure a pool to set a specific QoS level within a packet,
based on the targeted pool.
Optional
Type of Service
(ToS) level
You can configure a pool to set a specific ToS level within a packet,
based on the targeted pool.
Optional
Disabling of SNAT
and NAT
connections
You can configure a pool so that SNATs and NATs are
automatically disabled for any connections using that pool.
Optional
Forwarding You can configure a forwarding pool, which causes a connection to
be forwarded, using IP routing, instead of load balanced. Creating a
forwarding pool allows you to use pool-based features for traffic that
should be forwarded.
Optional
Table 4.1 The attributes of a pool
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