Cisco Cisco Email Security Appliance C160 Mode D'Emploi

Q. Can the Destination Controls function be applied at the cluster level, or is it 
local machine level only?

It may be set at a cluster level; however, the limits are on a per-machine basis. 
So if you limit to 50 connections, that is the limit set for each machine in the 
cluster.

Q. What can I do to maximize efficiency and minimize problems when setting up 
a cluster? 

Initial Planning

Try to configure as many things as possible at the cluster level.

Manage by machines only for the exceptions.

If you have multiple data centers, for example, use groups to share traits 
that are neither cluster-wide nor necessarily machine-specific.

Use the same name for Interfaces and Listeners on each of the appliances.

Be aware of restricted commands.

Pay attention to interdependencies among settings.

For example, the 

listenerconfig

 command (even at the cluster level) 

depends on interfaces that only exist at a machine level. If the interface does 
not exist at the machine level on all machines in the cluster, that listener will 
be disabled. 

Note that deleting an interface would also affect 

listenerconfig

.

 Pay attention to your settings!

Remember that previously-configured machines will lose their independent 
settings upon joining a cluster. If you want to re-apply some of these 
previously configured settings at the machine level, be sure to take note of all 
settings before joining the cluster.

Remember that a “disconnected” machine is still part of the cluster. When it 
is reconnected, any changes you made while it was offline will be 
synchronized with the rest of the cluster.