is). The dilemma is what to do when it doesn't know what to do. As it stands now, in the absence
of a suitable routing table entry to a given destination, a router has no choice but to return an
ICMP "Destination Unreachable" message to the sender.
the traffic on to another router that may have a suitable entry in a routing table to keep the traffic
flow alive. This is known as the gateway of last resort.
protocol and its configuration, the default route can even be injected into the routing table
automatically.
network command. There is a catch here, however: The router must have a valid route (either
static or dynamic) to the default network. If the routing table does not have an entry for the
default network, one must be entered. Example 6-12 illustrates this concept.
the routing protocol supports it, a static default route to the network 0.0.0.0 0.0.0.0 is used. The
entry is that of a static route. Example 6-13 illustrates the static default route.
specific next hop is not redistributed automatically. If the overall desire is to have this route
automatically redistribute, an outbound interface can be specified. This is true with all static
routes, not just the static default route. Example 6-14 illustrates the same configuration, but with
one that does have to be manually redistributed.
out interface serial 0 to the device on the other side of the link.
RouterB(config)#ip default-network 10.11.1.0