Nortel Secure Router 8000 Series
Configuration -WAN Access
viii
Nortel Networks Inc.
Issue 5.3 (30 March 2009)
7.5 Configuring load balancing.......................................................................................................................7-31
7.5.1 Establishing the configuration task .................................................................................................7-31
7.5.2 Enabling or disabling X.25 switching .............................................................................................7-32
7.5.3 Configuring X.25 hunt group..........................................................................................................7-32
7.5.4 Configuring X.25 switching route...................................................................................................7-33
7.5.5 Checking the configuration.............................................................................................................7-33
7.6 Configuring XOT......................................................................................................................................7-34
7.6.1 Establishing the configuration task .................................................................................................7-34
7.6.2 Starting X.25 switching...................................................................................................................7-34
7.6.3 Configuring local switching (SVC).................................................................................................7-35
7.6.4 Configuring XOT route...................................................................................................................7-35
7.6.5 Configuring optional keepalive and Xot-source attributes..............................................................7-36
7.6.6 Checking the configuration.............................................................................................................7-37
7.7 Maintaining LAPB and X.25.....................................................................................................................7-37
7.7.1 Clearing the serial interface LAPB statistics...................................................................................7-37
7.7.2 Debugging X.25..............................................................................................................................7-38
7.8 Configuration examples.............................................................................................................................7-38
7.8.1 Example for configuring LAPB ......................................................................................................7-39
7.8.2 Example for directly connecting two routers by Using X.25..........................................................7-41
7.8.3 Example for connecting routers to an X.25 public packet network.................................................7-44
7.8.4 Example for configuring the VC range...........................................................................................7-48
7.8.5 Example for transmitting IP datagrams through X.25 PVC............................................................7-50
7.8.6 Example for configuring X.25 sub-interfaces .................................................................................7-52
7.8.7 Example for configuring the SVC function of XOT.......................................................................7-57
7.8.8 Example for configuring the PVC function of XOT.......................................................................7-61
7.8.9 Example for configuring the X.25 load balancing...........................................................................7-65
7.8.10 Example for configuring the X.25 load balancing carrying IP Datagrams....................................7-69
7.8.11 Example for configuring the TCP/IP header compression ............................................................7-73
7.9 Troubleshooting.........................................................................................................................................7-75
7.9.1 LAPB is always disconnected.........................................................................................................7-75
7.9.2 LAPB protocol is up, VC cannot be established .............................................................................7-75
7.9.3 X.25 Protocol cannot enter the up status.........................................................................................7-76
7.9.4 X.25 Protocol is up, VC cannot be established ...............................................................................7-76
7.9.5 Frequently reset or cleared during data transmission ......................................................................7-77
7.9.6 Request to set PVCs is rejected.......................................................................................................7-77
7.9.7 After SVC application of XOT is configured, the ping fails ...........................................................7-78
7.9.8 After PVC application of XOT is configured, the ping fails ...........................................................7-78
8 Frame relay configuration ........................................................................................................8-1
8.1 Introduction.................................................................................................................................................8-3
8.1.1 FR protocol and related concepts......................................................................................................8-3
8.1.2 PVC standby of frame relay switching..............................................................................................8-7