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Configuration of RIP and IGRP 375
The network Command
Each network command enables RIP or IGRP on a set of interfaces. However, as a CCNA, you
must understand the subtleties to what that really means (as explained in the next several
paragraphs.) However, what "enables" really means in this case is not obvious from Cisco IOS
documentation. Also, the parameters for the network command are not intuitive to many
people new to Cisco IOS configuration commands; therefore, routing protocol configuration,
including the network command, is a likely topic for tricky questions on the exam.
The network command causes implementation of the following three functions:
·
Routing updates are broadcast or multicast out an interface.
·
Routing updates are processed if they enter that same interface.
·
The subnet directly connected to that interface is advertised.
The network command matches some of the interfaces on a router. The interfaces matched by
the network command have the three functions previously mentioned performed on them.
Examples provide a much easier understanding of the network command, as demonstrated in
Figure 6-9 and Example 6-1.
Figure 6-9
Sample Router with Five Interfaces
ping
Sends and receives ICMP echo messages to verify connectivity
trace
Sends a series of ICMP echoes with increasing TTL values to
verify the current route to a host
Table 6-13
IP RIP and IGRP EXEC (Continued)
Command
Function
172.16.1.1
S1 199.1.2.1
E1
E0
To 0
S0 199.1.1.1
10.1.2.3
10.1.3.3
Token
Ring
ch06.fm Page 375 Monday, March 20, 2000 5:11 PM