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Configuring PPP callback ············································································································································ 185
Configuring the callback client ·························································································································· 186
Configuring the callback server ························································································································· 187
Configuring ISDN caller number callback ················································································································ 188
Overview ······························································································································································ 188
Configuration restrictions and guidelines ········································································································· 189
Configuring a callback server by using traditional DDR ················································································· 189
Configuring a callback server by using bundle DDR ······················································································ 189
Configuring auto-dial ··················································································································································· 190
Configuring dynamic route backup through DDR ···································································································· 190
Creating a dynamic route backup group ········································································································· 191
Assigning a dialup interface to a dynamic route backup group ··································································· 191
Setting the delay for disconnecting a backup link ··························································································· 192
Setting the warm-up timer for dynamic route backup ······················································································ 192
Disconnecting a dialup link ········································································································································· 192
Displaying and maintaining DDR ······························································································································· 193
DDR configuration examples ······································································································································ 193
PSTN-based traditional DDR configuration example ······················································································· 193
PSTN-based bundle DDR configuration example ····························································································· 195
ISDN-based traditional DDR configuration example ······················································································· 199
ISDN-based bundle DDR configuration example ····························································································· 201
MP for DDR configuration example ··················································································································· 204
ISDN caller number callback configuration example ······················································································ 207
Router-to-router PPP callback configuration example ······················································································· 208
Router-to-PC PPP callback configuration example ···························································································· 211
NT server-to-router PPP callback configuration example ················································································· 213
Configuration example for circular dial string backup and Internet access ················································· 215
Dynamic route backup for traditional DDR configuration example ······························································· 221
Dynamic route backup for bundle DDR configuration example ····································································· 223
Configuration example for dynamic route backup for multiple networks ····················································· 226
Troubleshooting ···························································································································································· 228
Symptom 1: Failure to establish a dialup connection ····················································································· 228
Solution ································································································································································· 228
Symptom 2: Ping failure ····································································································································· 229
Solution ································································································································································· 229
Configuring Frame Relay ········································································································································ 230
Overview ······································································································································································· 230
Frame Relay interface types ······························································································································· 230
Virtual circuit ························································································································································ 231
DLCI ······································································································································································ 231
Frame Relay address mapping ·························································································································· 232
LMI protocol ························································································································································· 232
Application scenarios ········································································································································· 234
Command and hardware compatibility ···················································································································· 235
Frame Relay configuration task list ····························································································································· 235
Configuring basic DTE-side Frame Relay ·················································································································· 236
Configuring basic DCE-side Frame Relay ················································································································· 237
Configuring local Frame Relay virtual circuits ·········································································································· 237
Configuration restrictions and guidelines ········································································································· 237
Configuration procedure ···································································································································· 238
Configuring Frame Relay address mapping ············································································································· 238
Configuring static address-to-DLCI maps ·········································································································· 238
Configuring dynamic address mapping ··········································································································· 239
Configuring Frame Relay subinterfaces ····················································································································· 239
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