Router#sh ip route
(skip)
10.0.0.0/8 is variably subnetted, 3 subnets, 3 masks
C 10.1.1.0/24 is directly connected, Ethernet0/0
D EX 10.1.1.0/28[90/123456] via 192.168.1.1, 5w3d, Ethernet0/1
L 10.1.1.1/32 is directly connected, Ethernet0/0
解決策
その ARP 応答が好ましくない場合、該当の interface で Proxy ARP を無効とするか、longest match となる経路を学習させないようにする必要があります。
Router#show ip interface e0/0
Ethernet0/0 is up, line protocol is up
Internet address is 10.1.1.1/24
(skip)
Inbound access list is not set
Proxy ARP is enabled
Local Proxy ARP is disabled
(skip)
Router#conf t
Enter configuration commands, one per line. End with CNTL/Z.
Router(config)#int e0/0
Router(config-if)#no ip proxy-arp
Router(config-if)#end
Router#show ip interface e0/0
Ethernet0/0 is up, line protocol is up
(skip) Inbound access list is not set
Proxy ARP is disabled
Local Proxy ARP is disabled