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Advanced DDR Operations 159
In Example 6-22, there are a number of items to note. For instance, notice that there is no dialer
map statement. The mapping is performed in separate statements. The dialer string statement
defines the remote phone number as well as the map class (named remote) to utilize in dialing
that destination. This is why it is possible to use the outbound interface for the static route
definition. This particular example also makes use of the rate adaptation capabilities. The dialer
pool statements bind each interface (both logical and physical) together as a single operating
entity.
Dialer profiles are a very useful addition to the configuration arsenal offered by Cisco IOS.
However, they also represents a new set of issues and commands for troubleshooting. As with
other implementations of ISDN, it is wise to simply utilize the debug commands discussed to
this point.
To view the status of a dialer interface, the show dialer interface bri 0 command can be of use,
as demonstrated in Example 6-23.
The show dialer interface bri 0 command displays the status of each B channel and its
configured settings. It specifies the reason for the call setup as well as the interface to which the
physical interface is bound.
Rotary Groups
ISDN rotary groups are similar to dialer pools. One primary difference, however, is the lack of
map class capabilities in rotary groups. Configuring rotary groups involves the creation of
logical dialer interfaces (as is done in dialer pool configurations), the interface designation of
which is an important detail.
Example 6-23
show dialer interface bri 0 Command Output
RouterA#show dialer interface bri 0
BRI0 - dialer type = ISDN
Dial String Successes Failures Last called Last status
0 incoming call(s) have been screened.
BRI0: B-Channel 1
Idle timer (120 secs), Fast idle timer (20 secs)
Wait for carrier (30 secs), Re-enable (15 secs)
Dialer state is data link layer up
Dial reason: ip (s=10.12.1.1, d=10.12.1.2)
Interface bound to profile Dialer0
Time until disconnect 102 secs
Current call connected 00:00:19
Connected to 2145552222 (RouterB)
BRI0: B-Channel 2
Idle timer (120 secs), Fast idle timer (20 secs)
Wait for carrier (30 secs), Re-enable (15 secs)
Dialer state is idle