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2.22.2 Management of IP Route Information
IP route information is managed by the route table of routing protocol and routing table.
Explanation regarding 2 tables is given below.
Routing table
Routing table is structured by the priority route (Best path) that is selected from the IP route information.
Moreover, in the IP route information which is managed by the routing table, the information wherein the
interface route is excluded; is managed as number of routing entries.
Maximum number of entries is prescribed in each device for the routing entries and the route information
wherein number of maximum entries exceeds is destroyed. Furthermore, it is managed separately in IPv4 and
IPv6.
Points to be noted
In the routing table, the IP route information received by exceeding the maximum value of routine entries is
destroyed and is not registered. Moreover, the registration is not done even if the number of maximum entries
is not fulfilled according to the IP route information. When route registration is failed, the system log which
shows the failure of registration is recorded. Restart the device after the review of network configuration and
route information.
2.22.3
Route Control Function according to the Error Detection of Interface
The interface route information can be deleted from the routing table due to error detection (such as
abnormal detection by hardware) of interface. The IP route information (Route information of same address)
created by the static routing function can be converted according to the deletion of this interface route.
Moreover, the error detection of interface is notified as abnormality of interface that is used by the static
routing function and routes can be converted in the static routing function.
2.22.4 Static Routing Function
Static route is used and the IP route information is controlled by combining with the following functions.
• Function to control route by fault detection of interface
The static route by which related interface is considered as 'exit' can be deleted from the routing table due to
error detection of interface.
• Priority Route Control Function
The IP route information added in the routing table by the priority (distance) related to the route of same
address can be selected. Smaller the priority, it is handled as the priority route and only the priority route is
reflected in the routing table. Moreover, when that priority route is invalid, conversion to the next priority route
is possible.
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