Interface IP address installed as host route in routing table

[duongla]

Hello,

I connect two Cisco 2600 router using aux ports (back-to-back). The IP address of first router async interface is 172.16.4.1/24 and the second is 172.16.4.2/24.

Output from "show ip ro" shows on routers shows both the subnet 172.16.4.0/24 and the host route 172.16.4.1/32 (on first router).

Can anyone explain why the host route is installed in the routing table ?

Thanks

Duong

[Kevin Dorrell · Accepted solution]

Normally I would expect to see a host route in each router to the other router's interface. This is installed by the PPP when they compare IP addresses during the IPCP phase. You can prevent it with the interface command no peer neighbor-route.

Kevin Dorrell

Luxembourg