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Essential Configuration Tasks
3-DNS
®
Administrator Guide 5 - 13
Viewing host performance metrics
The Configuration utility displays the host metrics in the Host Statistics
screen. The 3-DNS Controller bases the advanced load balancing decisions
on packet rate, kilobytes per second, and current connections metrics, but
the Host Statistics screen displays the other metrics as well, for information
purposes.
Reviewing SNMP configuration issues
The SNMP probing feature requires that each host run an SNMP agent, and
that the hosts and the big3d agents in the data centers have open network
communication. Certain firewall configurations block SNMP
communications, and you may need to verify that the firewalls in your
network allow SNMP traffic to pass through.
In addition to properly configuring the SNMP agents on the hosts
themselves, you need to specify SNMP host probing settings in two places
in the 3-DNS configuration. First, when you define a 3-DNS Controller or
BIG-IP system, you set the big3d agent to run at least one SNMP factory.
Second, when you define the host servers, you configure specific SNMP
agent settings for each host. For example, you need to specify the type of
agent running on the host as well as the community string that allows access
to the SNMP agent. Last, you configure the SNMP agent on the host itself.
We recommend that you use the documentation originally provided with
host to configure the SNMP agent.
Note
For more information about working with the big3d agent and SNMP, refer
to Chapter 5, Probing and Metrics Collection, in the 3-DNS Reference
Guide.
Working with sync groups
A sync group defines a group of 3-DNS Controllers that synchronize their
configuration settings, metrics data, and zone files (optional). A sync group
contains a principal system and one or more receiver systems. The principal
system is the 3-DNS Controller from which the receiver systems obtain their
metrics and server statistics information. You configure a sync group from
the principal 3-DNS Controller. First list the IP address of the principal
itself. Then list the receiver 3-DNS Controllers in the order that they should
become principals if previously listed 3-DNS Controllers fail.
Configuring sync groups
The following procedures describe how to configure sync groups.