Cisco Cisco Email Security Appliance C170 Guia Do Utilizador

Machines in a cluster must have resolvable hostnames in DNS. Alternatively, you can use IP 
addresses instead, but you may not mix the two.

. Cluster communication is normally initiated using 

the DNS hostnames of the machines.

A cluster must consist entirely of machines in the same series (X-Series and C-Series are 
compatible). 

For example, Cisco X1000, C60, C600, C30, C300, and C10 appliances can be in the same cluster; 
however, C60 and A60 appliances cannot be in the same cluster. If you attempt to add an 
incompatible appliance to an existing cluster, an error message explaining why that appliance cannot 
be added to the cluster will be displayed. 

A cluster must consist entirely of machines running the same version of AsyncOS. 

See 

 for how to upgrade members of a cluster.

Machines can either join the cluster via SSH (typically on port 22) or via the Cluster Communication 
Service (CCS). 

See 

Once machines have joined the cluster, they can communicate via SSH or via Cluster 
Communication Service. The port used in configurable. SSH is typically enabled on port 22, and by 
default CCS is on port 2222, but you can configure either of these services on a different port. 

In addition to the normal firewall ports that must be opened for the appliance, clustered machines 
communicating via CCS must be able to connect with each other via the CCS port. See 

. 

You must use the Command Line Interface (CLI) command 

clusterconfig

 to create, join, or 

configure clusters of machines. 

Once you have created a cluster, you can manage non-cluster configuration settings from either the 
GUI or the CLI.

See 

 and 

Within a cluster, configuration information is divided into 3 groupings or levels. The top level describes 
cluster settings; the middle level describes group settings; and the lowest level describes 
machine-specific settings.