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26.3 Static Route
26.3.1 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.
26.3.2 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.
26.3.3 Static Route Configuration Task List
1. Static route configuration
1. Static route configuration
Command
Explanation
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