Information Technology Reference
In-Depth Information
Dial Backup Configuration
ISDN can back up a primary circuit if it fails or has exceeded a use threshold. If the primary
fails, the ISDN circuit is enabled. While the connection is up, IP traffic is passed through the
backup interface. Also, the backup BRI can be enabled if the primary circuit reaches a certain
load. In Example 5-11, the BRI is enabled if serial 0 reaches 60 percent load or if serial 0 is
down for 25 seconds. The BRI is disabled if serial 0 is back up for 60 seconds or if the
bandwidth in the primary is below 10 percent.
Example 5-11
Dial Backup Configuration
interface serial 09
ip address 10.100.1.101 255.255.255.252
backup delay 25 60
backup load 60 10
backup interface bri 0
!
interface bri 0
ip address 10.1.1.101 255.255.255.252
dialer string 2817001111
dialer-group 1
!
dialer-list 1 protocol ip permit
ISDN has many uses and configurations. For more configuration examples, go to the following
site:
www.cisco.com/univercd/cc/td/doc/product/software/ios120/12cgcr/dial_c/
dcbri.htm#xtocid610022
ATM Architecture
This section uses the ATM reference model to describe the general architecture of ATM.
ATM was developed to meet the need to transport voice, data, and video across enterprise and
service provider networks. ATM is a connection-oriented, cell switching, transport technology.
ATM supports the ability to adapt to different bandwidths and QoS requirements.
Figure 5-14 ATM Reference Model shows the various functions within the ATM architecture.
The ATM reference model is divided into three areas: user, management, and control. The
physical transport functions are part of the control plane.
The user plane is responsible for the transfer of video, voice, and data applications. The user
plane is associated with flow control and error recovery.
The management plane is responsible for the interaction between the user plane, control plane,
and transport facilities.
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