Example 77 Configurations for RTR A and RTR B in Figure

RTR A

Figure 7-9. Network Experiencing an EIGRP Neighbor Problem Because

Mismatched AS Numbers

RTR B#show running-config interface serial 0

IP address 10.1.1.1 255.255.255.0

router eigrp 11 network 10.0.0.0

RTR A#show running-config

Interface serial 0

IP address 10.1.1.2 255.255.255.0

router eigrp 1

network 10.0.0.0

You should notice the misconfiguration immediately. RTR B's Serial 0 interface is con-figured to be in EIGRP AS number 11, while RTR A's Serial 0 is configured to be in EIGRP AS number 1. Because the AS numbers don't match across the link, no EIGRP neighbor relationship will be formed. To resolve this problem, simply configure both routers with the same EIGRP AS number, as shown in Example 78. In this example, both routers will be configured to be in EIGRP AS 1.

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