This article describes some of the maximum limits for the Cisco Email Security (ESA) C series and Security Management (SMA) M series appliances.
Warning: The numbers mentioned below are for information and reference only. Configuring devices with the settings even close to these values will cause functionality and/or performance issues and is strongly not recommended!
Cisco IronPort C and M series appliances.
What are some of the maximum limits for Email Security and Secure Management Appliances?
Device and network configuration
Maximum number Listeners
Maximum number of IP Routes
Maximum number of SMTP routes
The final default route of ALL is counted as a route against this limit.
Maximum number of destination hosts per SMTP Route
ESA GUI accepts more than 100 records. Refer to defect CSCvu84839 for more details.
Maximum number of machines supported in Cluster
Having more than 20 appliances in a cluster can cause errors in cluster communication.
Maximum number of Domain Map entries under each listener