ASA ECMP static routing

On a Cisco ASA, it is possible to configure up to eight equal cost static routes to a particular destination per interface. Equal-cost Multi-path routing (ECMP) is only supported for static routes on the same interface. ECMP is not supported across multiple interfaces.

Here is an example:

ASA1(config)# route outside 10.10.10.0 255.255.255.0 192.168.1.1
ASA1(config)# route outside 10.10.10.0 255.255.255.0 192.168.1.2
ASA1(config)# route outside 10.10.10.0 255.255.255.0 192.168.1.3
ASA1(config)# route outside 10.10.10.0 255.255.255.0 192.168.1.4
ASA1(config)# route outside 10.10.10.0 255.255.255.0 192.168.1.5
ASA1(config)# route outside 10.10.10.0 255.255.255.0 192.168.1.6
ASA1(config)# route outside 10.10.10.0 255.255.255.0 192.168.1.7
ASA1(config)# route outside 10.10.10.0 255.255.255.0 192.168.1.8
ASA1(config)# route outside 10.10.10.0 255.255.255.0 192.168.1.9
ERROR: The maximum number of equal cost routes allowed is 8

Of course, the number of maximum ECMP routes can be different between platforms and/or software versions.