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334 CHAPTER 20: DCC CONFIGURATION COMMANDS
The physical interfaces in C-DCC and Resource-Shared DCC do not use individual
network addresses. Instead, they use the addresses of the corresponding dialer
interfaces.
In both C-DCC and RS-DCC, physical interfaces use the network addresses of their
associated dialer interface rather than being assigned separate addresses.
Example # Create dialer interface Dialer1.
<Sysname> system-view
[Sysname] interface dialer 1
ppp callback
Syntax ppp callback { client | server }
undo ppp callback { client | server }
View Dial interface (physical or dialer) view
Parameter client: Sends callback requests as the PPP callback client.
server: Accepts callback requests as the PPP callback server.
Description Use the
ppp callback command to specify the interface as the server or client to
send or accept PPP callback requests.
Use the
undo ppp callback command to disable the interface as the PPP
callback server or client.
By default, callback is disabled.
PPP callback adopts the client/server model where the calling party is the callback
client and the called party is the callback server. The client first originates a call,
and the server decides whether to originate a return call. If a return call is needed,
the callback server disconnects and then originates a return call according to the
information such as username or callback number.
This is useful for saving cost in the case that the call rates in two directions are
different.
Example # Configure interface Serial 2/0 as the PPP callback server to accept callback
requests.
<Sysname> system-view
[Sysname] interface serial 2/0
[Sysname-Serial2/0] ppp callback server
ppp callback ntstring
Syntax ppp callback ntstring dial-number