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Chapter 4: Configuring the High-Level Network

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Nodes

Nodes are the network devices to which the BIG-IP passes traffic. A

network device becomes a node when it is added as a member to a load

balancing pool. You can display information about nodes and set properties

for nodes.

The attributes you can configure for a node are listed in Table 4.21.

To enable and disable nodes and node addresses

A node must be enabled in order to accept traffic. When a node is disabled,

it allows existing connections to time out or end normally and accept new

connections only if they belong to an existing persistence session. (In this

way a disabled node differs from a node that is set down. The down node

allows existing connections to time out, but accepts no new connections.)

To enable a node or node address, use the node command with the enable

option:

b node 192.168.21.1 enable

To disable a node or node address, use the node command with the disable

option:

b node 192.168.21.1 disable

To mark nodes and node ports up or down

A node must be marked up in order to accept traffic. When a node is marked

down it allows existing connections to time out but accepts no new

connections.

To mark a node down, specify the node command with a node address and

the down option. (Note that marking a node down prevents the node from

accepting new connections. Existing connections are allowed to complete.)

b node 192.168.21.1 down

Node Attributes Description

Enable/Disable

nodes

You can enable or disable nodes independent of a load balancing pool.

Set node up/down You can set a node to up or down.

Connection limit You can place a connection limit on a node.

Associate a node

with a monitor

You can associate a health monitor with a node, creating an instance of that monitor.

Add a node as a

member of a pool

You can add a node to a pool as a member. This allows you to use the load balancing and

persistence methods defined in the pool to control connections handled by the node.

Table 4.21 The attributes you can configure for a node.

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