Multiple irules using same local variable name

It is somewhat inconvenient. You could try something like setting a single local variable (not in RULE_INIT) in each rule to something unique and then build the variable names in that particular rule based on the first variable. Maybe an example would be easier to demonstrate:

rule rule1 {
   when CLIENT_ACCEPTED {
      set var_prefix "rule1"
      set ${var_prefix}var1 "this is rule1's var1 value"
      log local0. "$var_prefix variable name ${var_prefix}var1, variable value: [set [subst ${var_prefix}var1]]"
   }
}

rule rule2 {
   when CLIENT_ACCEPTED {
      set var_prefix "rule2"
      set ${var_prefix}var1 "this is rule2's var1 value"
      log local0. "$var_prefix variable name ${var_prefix}var1, variable value: [set [subst ${var_prefix}var1]]"
   }
}

Here is the sample output from a request to a vip with both rule1 and rule2 added:

Rule test_rule1 : rule1 variable name rule1var1, variable value: this is rule1's var1 value
Rule test_rule2 : rule2 variable name rule2var1, variable value: this is rule2's var1 value

I guess you could put in a feature request with F5 support asking for the scope of local variables to be limited to the rule they're set in, but I'm guessing there is a good reason for the way it is now.

Aaron