Interoperating with DMS100 switches
Network requirements
As shown in Figure 22, Router D is connected to a DMS100 switch of the carrier, using the access number of 8810148. The ISDN lines on interface BRI 1/0 are assigned the following two SPIDs and LDNs:
SPID1 = 31427583620101, LDN1 = 1234567
SPID2 = 31427583870101, LDN2 = 7654321
In addition, the username and password for dialing are user and hello, respectively.
Router D needs to place an MP call on interface BRI 2/0 to obtain an address from the carrier for accessing the Internet.
Figure 22: Network diagram
Configuration procedure
# Enable IP packet-triggered dial.
<Router> system-view [Router] dialer-rule 1 ip permit
# Encapsulate interface BRI 2/0 with MP.
[Router] interface bri 2/0 [Router-Bri2/0] link-protocol ppp [Router-Bri2/0] ppp mp
# Enable C-DCC.
[Router-Bri2/0] dialer enable-circular [Router-Bri2/0] dialer-group 1 [Router-Bri2/0] dialer circular-group 1
# Configure ISDN parameters.
[Router-Bri2/0] isdn protocol-type ni [Router-Bri2/0] isdn two-tei [Router-Bri2/0] isdn number-property 0 [Router-Bri2/0] isdn spid1 31427583620101 1234567 [Router-Bri2/0] isdn spid2 31427583870101 7654321 [Router-Bri2/0] isdn spid service data [Router-Bri2/0] isdn spid service speech [Router-Bri2/0] quit
# Configure a dialer interface.
[Router] interface dialer 1 [Router-Dialer1] link-protocol ppp [Router-Dialer1] ppp pap local-user user password simple hello [Router-Dialer1] dialer threshold 0 in-out [Router-Dialer1] ppp mp [Router-Dialer1] ip address ppp-negotiate [Router-Dialer1] dialer enable-circular [Router-Dialer1] dialer-group 1 [Router-Dialer1] dialer number 8810148 [Router-Dialer1] quit
# Configure the static route to segment 65.0.0.0 where the network access server is located.
[Router] ip route-static 65.0.0.0 255.0.0.0 Dialer 1 preference 60
To interoperate with the DMS 100, configure two commands: isdn two-tei and isdn number-property 0. The isdn two-tei command allows each call on the BRI interface to use a unique TEI. The isdn number-property 0 command sets the numbering plan and numbering type in the called-party information element in ISDN Q.931 SETUP messages to unknown.
In addition, if the carrier allocates an LDN, you must configure it.
The dialer threshold 0 in-out command configured on interface dialer 1 allows the system to bring up another B channel automatically after bringing up a BRI link. This can be done without a flow control mechanism and the links that have been brought up will not be disconnected automatically.