Sunday, December 5, 2010

PPP Host Routes

The output of the show ip route command might differ between PPP and HDLC encapsulations when IP unnumbered configuration is used on serial interfaces. PPP installs a host route to the IP address that is used on the serial interface at the other end as a directly connected network. If the same prefix is also learned through OSPF as in this configuration, it displays only as a connected route. This is because connected routes have a lower administrative distance than OSPF and are more preferred. You can change this behavior when you issue the "no peer neighbor-route" command under the serial interfaces which prevents a host route from being installed and treats it as an OSPF route.

This is not the case with HDLC because it does not install a host route. HDLC installs an OSPF route for the address on the other end when IP unnumbered is used.

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