User Manual UMN:CLI
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As the needs of the case demand, you may also conditionally restrict the routing
information between the two networks using route-map command. For more information,
refer to 11.7 Configuring Route Map.
11.5.6 Metrics for Redistributed Routes
The metrics of one routing protocol do not necessarily translate into the metrics of another.
For example, the RIP metric is a hop count and the OSPF metric is a combination of five
quantities. In such situations, an artificial metric is assigned to the redistributed route.
Because of this unavoidable tampering with dynamic information, carelessly exchanging
routing information between different routing protocols can create routing loops, which
can seriously degrade network operation. To prevent this situation, we configure metrics
for redistributed routes.
To set metrics for redistributed routes, use the following command.
Configures the equal metric of all routes transmitted by
routing protocol, enter the value.
1-16: default metric value
Removes the equal metric of all routes transmitted by
routing protocol.
The metric of all protocol can be configured from 0 to 4294967295. It can be configured
from 1 to 16 for RIPng.
11.5.7 Administrative Distance
Administrative distance is a measure of the trustworthiness of the source of the routing
information.
In large scaled network, Administrative distance is the feature that routers use in order to
select the best path when there are two or more different routes to the same destination
from two different routing protocols. Administrative distance defines the reliability of a
routing protocol. Each routing protocol is prioritized in order of most to least reliable
(believable) with the help of an administrative distance value.
Remember that administrative distance has only local significance, and is not advertised
in routing updates. Most routing protocols have metric structures and algorithms that are
not compatible with other protocols. In a network with multiple routing protocols, the
exchange of route information and the capability to select the best path across the
multiple protocols are critical. Administrator should set the distance value based on whole
routing networks.
To configure the administrative distance value, use the following command.
distance <1-255> [X:X::X:X/M
[WORD]]
Sets the administrative distance value for routes.
1-255: distance value
X:X::X:X/M: IP source prefix
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