3Com Router User Manual

Typical X.25 Configuration Example237
[Router-fr-dlci-100]x25-template profile1
[Router-fr-dlci-100]quit
iMap the Frame Relay address to the destination IP address.
[Router-Serial1]fr map ip 202.38.163.252 100
2Configure RouterB:
aCreate an X.25 template.
[Router]x25 template profile1
bConfigure the local X.25 address.
[Router-x25-profile1]x25 x121-address 20094
cMap the destination X.25 address to the destination IP address.
[Router-x25-profile1]x25 map ip 202.38.163.251 x121-address 10094...

238CHAPTER 16: CONFIGURING LAPB AND X.25
II. Networking Diagram
Figure 78   Networking for the SVC application of X.25 over Frame Relay
III. Configuration Procedure
1Configure the router Router A:
aConfigure the basic X.25 parameters.
[Router]interface serial 0
[Router-Serial0]link-protocol x25 dte ietf
[Router-Serial0]x25 x121-address 1
[Router-Serial0]x25 map ip 1.1.1.2 x121-address 2
[Router-Serial0]ip address 1.1.1.1 255.0.0.0
2Configure the router Router D:
aConfigure the basic X.25 parameters:...

Typical X.25 Configuration Example239
[Router]x25 switch svc 1 interface serial 0
gConfigure X.25 over Frame Relay switching.
[Router]x25 switch svc 2 interface serial 1 dlci 100
4Configure the router Router C:
aEnable X.25 switching.
[Router]x25 switching
bConfigure Serial 0 as the X.25 interface.
[Router]interface serial 0
[Router-Serial0]link-protocol x25 dce ietf
cConfigure Serial 1 as the Frame Relay interface.
[Router]interface serial 1
[Router-Serial1]link-protocol fr
dConfigure the Frame Relay...

240CHAPTER 16: CONFIGURING LAPB AND X.25
[Router-Serial0]x25 x121-address 1
[Router-Serial0]x25 vc-range in-channel 10 20 bi-channel 30 1024
[Router-Serial0]x25 pvc 1 ip 1.1.1.2 x121-address 2
[Router-Serial0]ip address 1.1.1.1 255.0.0.0
2Configure Router D:
aConfigure the basic X.25 parameters.
[Router]interface serial 0
[Router-Serial0]link-protocol x25 dte ietf
[Router-Serial0]x25 x121-address 2
[Router-Serial0]x25 vc-range in-channel 10 20 bi-channel 30 1024
[Router-Serial0]x25 pvc 1 ip 1.1.1.1...

Fault Diagnosis and Troubleshooting of LAPB241
[Router-x25-profile1]x25 vc-range in-channel 10 20 bi-channel 30 
1024
[Router-x25-profile1]x25 pvc 1 interface serial 0 pvc 1
5Configure Serial 1.
aConfigure S1 as the Frame Relay interface.
[Router]interface serial 1
[Router-Serial1]link-protocol frame-relay
bConfigure a Frame Relay Annex G DLCI.
[Router-Serial1]fr dlci 100
[Router-fr-dlci-100]annexg dte
cApply the X.25 template to Annex G DLCI 100 (which is equivalent to 
configure X.25 attributes for the...

242CHAPTER 16: CONFIGURING LAPB AND X.25
■Facility options inhibited by network have been carried.
Troubleshooting: if the address is configured incorrectly, change the configuration. 
For the last two causes, please consult the network management department for 
correct channel range and permissible facility options.
Fault 3: The virtual circuit can be established, but is frequently reset or 
cleared during data transmission.
Troubleshooting: It is very likely that the flow control parameters are set...

Fault Diagnosis and Troubleshooting of X.25243
■If receiving the ping packet forwarded from the router at one end, check 
whether the returning route has been configured in the routing table. In 
addition, if the destination IP address for returning the packets is different from 
that configured in the Frame Relay address map and X.25 address map, you 
need to reconfigure the maps. 
■If multiple X.25 address maps for reaching the same destination X.121 address 
have been configured in an X.25 template,...

244CHAPTER 16: CONFIGURING LAPB AND X.25 

17
CONFIGURING FRAME RELAY
This chapter contains information on the following topics:
■Frame Relay Protocol Overview
■Configure Frame Relay
■Configure Frame Relay QoS
■Configure Frame Relay over Other Protocols
■Display and debug Frame Relay
■Typical Frame Relay Configuration Example
■Fault Diagnosis and Troubleshooting of Frame Relay
Frame Relay Protocol 
OverviewFrame Relay protocol is a fast-packaging switching technology, which develops on 
the basis of X.25 technology. Compared with X.25 protocol,...

246CHAPTER 17: CONFIGURING FRAME RELAY
Virtual circuits can be divided into permanent virtual circuit and switching virtual 
circuit, according to their different configuration method. Virtual circuits 
configured manually are called Permanent virtual circuits (PVCs), and those created 
by protocol negotiation are called switching virtual circuits (SVCs), which are 
automatically created and deleted by Inverse ARP protocol. At present, the most 
frequently used in Frame Relay is the permanent virtual...