Configuring C-Dcc - 3Com 3C13636 Configuration Manual

3Com Router 3000 Ethernet Family
Configuration Guide

1.2.2 Configuring C-DCC

If C-DCC is used, each physical interface can either be directly configured with the
DCC parameters, or bound to a dialer interface to inherit the DCC parameters through
a dialer circular group. Between these two options, configuring the DCC parameters
directly on a physical interface is only applicable for a single interface to originate calls
to one or more remote ends. However, dialer circular group is also applicable for
multiple interfaces to originate calls to one or more remote ends in addition to that.
Dialer circular group associates a dialer interface with a group of physical interfaces.
The DCC configurations of this dialer interface are automatically inherited by all the
physical interfaces in the dialer circular group. After configuring the parameters for the
dialer circular group, any physical interface in the group can call any predefined
destination if the dialer interface is associated with multiple destinations.
Depending on the network topology and DCC dialing demands, such as one interface
or multiple interfaces can both originate and receive calls, the user can flexibly use one
configuration or the combination of several configurations in the C-DCC configurations
introduced below.
Note:
In the C-DCC implementation of DCC, the two dial parties can configure password
authentication protocol (PAP) or challenge-handshake authentication protocol (CHAP)
authentication. However, the other party must configure authentication if one party has
done that. For security of dialing ID, the user is recommended to configure
authentication in actual networking applications. For configuration methods, refer to the
section in Operation Manual - Link Layer Protocol and note the following items
accordingly:
At the sending side, if DCC is directly enabled on the physical interface, directly
configure PAP or CHAP authentication on the physical interface. If DCC is enabled
through a dialer circular group, configure PAP or CHAP authentication on the dialer
interface.
When configuring PAP or CHAP authentication at the receiving end, the user is
recommended to make the configuration on both physical and dialer interfaces.
That is because the physical interface will first implement PPP negotiation and
authenticate the validity of the dialing user when receiving a DCC call request, and
then deliver the call to the upper layer DCC module for processing.
I. Configuring an interface to originate calls to a remote end
Perform the following configuration steps after the basic DCC configuration is
completed. As shown in the following figure, a local interface originates a call to a single
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Chapter 1 DCC Configuration