To modify the default RIPv2 behavior of automatic summarization, use the no auto-summary router configuration mode command as shown in Figure 2. This command has no effect when using RIPv1. When automatic summarization has been disabled, RIPv2 no longer summarizes networks to their classful address at boundary routers. RIPv2 now includes all subnets and their appropriate masks in its routing updates. The show ip protocols now states that automatic network summarization is not in effect.