
Configuration Examples
308621-14.00 Rev 00
B-33
Dial Backup over an ISDN Network
Figure B-6 shows dial backup service over an ISDN network. In this
configuration, the primary circuit is using PPP. If the primary circuit uses Nortel
Networks Standard or frame relay as the WAN protocol, the procedure is the same
as configuring PPP.
Figure B-6. Dial Backup over an ISDN Network
This ISDN example assumes the following:
• All BRI connections use a National ISDN 1 (NI1) switch.
• There is no incoming call filtering.
• Sending complete IEs are not used for call setup.
• The adaption rate is 64 Kb/s.
• CHAP is the PPP authentication protocol.
• IP is the only LAN protocol configured.
• The Ethernet segments shown in the network illustration are not configured.
• Only one phone number and SPID are used. (BRI lines usually have two
phone numbers and SPIDs.)
ISDN
ASN
AN
Router 1 Router 2
S131
.1
S12
.2
140.1.1.0
ISDN 1
ISDN 1
Local phone no: 4364444
Switch type: NI1
CHAP local name: ASN
CHAP secret: ISDN
Local phone no: 4363333
Switch type: NI1
CHAP local name: AN
CHAP secret: ISDN
DS0025A
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