EIGRP STUB区域设置了之后，路由器在丢失路由条目的时候不会向 STUB区域发查询消息，在上述top中我们可以把Rc做成 STUB区域，假如Rb的loop0 口down掉了之后，Rb不会向Rc发送查询消息。我们先在这3太路由器上全部启用EIGRP 10 ，所有的接口都参与到EIGRP 10 在没有设置stub的时候，得到路由表如下：
- RA：
- 1.0.0.0/24 is subnetted, 1 subnets
- C 1.1.1.0 is directly connected, Loopback0
- 2.0.0.0/24 is subnetted, 1 subnets
- D 2.2.2.0 [90/2297000] via 12.1.1.2, 00:01:26, Serial2/1
- 3.0.0.0/24 is subnetted, 1 subnets
- D 3.3.3.0 [90/2297000] via 12.1.1.2, 00:00:37, Serial2/1
- 23.0.0.0/30 is subnetted, 1 subnets
- D 23.1.1.0 [90/2297000] via 12.1.1.2, 00:01:26, Serial2/1
- 12.0.0.0/30 is subnetted, 1 subnets
- C 12.1.1.0 is directly connected, Serial2/1
- Rb：
- 1.0.0.0/24 is subnetted, 1 subnets
- D 1.1.1.0 [90/2297000] via 12.1.1.1, 00:02:30, Serial2/1
- 2.0.0.0/24 is subnetted, 1 subnets
- C 2.2.2.0 is directly connected, Loopback0
- 3.0.0.0/24 is subnetted, 1 subnets
- D 3.3.3.0 [90/2297000] via 23.1.1.1, 00:01:41, Serial2/2
- 23.0.0.0/30 is subnetted, 1 subnets
- C 23.1.1.0 is directly connected, Serial2/2
- 12.0.0.0/30 is subnetted, 1 subnets
- C 12.1.1.0 is directly connected, Serial2/1
- Rc:
- 1.0.0.0/24 is subnetted, 1 subnets
- D 1.1.1.0 [90/2297000] via 23.1.1.2, 00:02:06, Serial2/2
- 2.0.0.0/24 is subnetted, 1 subnets
- D 2.2.2.0 [90/2297000] via 23.1.1.2, 00:02:06, Serial2/2
- 3.0.0.0/24 is subnetted, 1 subnets
- C 3.3.3.0 is directly connected, Loopback0
- 23.0.0.0/30 is subnetted, 1 subnets
- C 23.1.1.0 is directly connected, Serial2/2
- 12.0.0.0/30 is subnetted, 1 subnets
- D 12.1.1.0 [90/2297000] via 23.1
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