Static Route
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38. Static Route
38.1
Introduction to Static Route
As mentioned earlier, the static route is the manually specified path to a network or a
host. Static route is simple and consistent, and can prevent illegal route modification, and
is convenient for load balance and route backup. However, it also has its own defects.
Static route, as its name indicates, is static, it won‘t modify the route automatically on
network failure, and manual configuration is required on such occasions, therefore it is not
suitable for mid and large-scale networks.
Static route is mainly used in the following two conditions: 1) in stable networks to
reduce load of route selection and routing data streams. For example, static route can be
used in route to STUB network. 2) For route backup, configure static route in the backup
line, with a lower priority than the main line.
Static route and dynamic route can coexist; layer3 switch will choose the route with
the highest priority according to the priority of routing protocols. At the same time, static
route can be introduced (redistribute) in dynamic route, and change the priority of the
static route introduced as required.
38.2
Introduction to Default Route
Default route is a kind of static route, which is used only when no matching route is
found. In the route table, default route in is indicated by a destination address of 0.0.0.0
and a network mask of 0.0.0.0, too. If the route table does not have the destination of a
packet and has no default route configured, the packet will be discarded, and an ICMP
packet will be sent to the source address indicate the destination address or network is
unreachable.
38.3
Static Route Configuration Task List
1. Static route configuration