How can i do a report that will show me all my routers that have a secondary ip address on them?
You can use the baseline compliance feature of RME to do this. Go to RME > Config Mgmt > Archive Mgmt > Baseline Templates, and create a new advanced template for your Routers group (or any other groups you may want). The template will simply consist of prerequisite command set, and one simple check for a ubiquitous command (like hostname):
Name : SecondaryCheck
IsPrerq : TRUE
Submode : interface [#.*#]
+ ip address [ADDR] [MASK] secondary
Name : HostnameCheck
IsPrereq : FALSE
Prereq : SecondaryCheck
+ hostname [NAME]
Then run a compliance check against all relevant devices. The resulting compliant devices have a secondary IP, and those excluded do not.