Cisco Cisco Email Security Appliance C160 Mode D'Emploi

Q. I would like to reconfigure the IP address and hostname on one of my clustered appliances. If I do 
this, will I lose my GUI/CLI session before being able to run the reboot command?

Follow these steps:

Add the new IP address

Move the listener onto the new address 

Leave the cluster 

Change the hostname

Make sure that oldmachinename does not appear in the 

clusterconfig

 connections list when 

viewed from any machine

Make sure that all GUI sessions are logged out

Make sure that CCS is not enabled on any interface (check via 

interfaceconfig

 or Network > 

Listeners)

Add the machine back into the cluster

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.

Remember that if you permanently remove a machine from a cluster, it will retain all of the settings 
it had as part of that cluster. However, if you change your mind and re-join the cluster, the machine 
will lose all standalone settings.