Siemens S223 User Manual

User Manual                                                                               UMN:CLI 
SURPASS hiD 6615 S223/S323 R1.5 

A50010-Y3-C150-2-7619                                                                         367 

Administrative distance is a measure of the trustworthiness of the source of the routing in-
formation. 

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 (be-
lievable) 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 ex-
change 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. 

 <1-255> [A.B.C.D/M 

[ACCESS-LIST]] 

Sets the administrative distance value for routes. 
1-255: distance value 
A.B.C.D/M: IP source prefix 
ACCESS-LIST: access list name 

 [<1-255>] [A.B.C.D/M 

[ACCESS-LIST]] 

Router 

Deletes the administrative distance value. 

 

You can set an autonomous system boundary router to generate and transmit a default 
route into an RIP routing domain. If you specifically set to generate a default routes into 
an RIP network, this router becomes an autonomous system (AS) boundary router. How-
ever, an AS boundary router does not generate a default route automatically into the RIP 
network. 

To generate a default route into RIP by the AS boundary router, use the following com-
mand on Router Configuration mode. 

Generates a default route into RIP by the AS boundary 
router. 

Router 

Disables a default route feature. 

 

You can limit the routing protocol information by performing the following tasks. 

•

  Block the transmission of routing information to a particular interface. This is to 

 

prevent other systems on an interface from learning about routes dynamically. 

•

 

Provides a local mechanism for increasing the value of routing metrics.