3Com 10014299 Typical Lapb Configuration Example, Current status of Lapb, Display and debug Lapb

			Display and Debug LAPB and X.25 223
	By default, X.25 template is not applied on DLCIs.
Display and Debug	In the all views, perform the following tasks to enable real-time monitoring of the
LAPB and X.25	current status of LAPB and X.25.
	Table 273 Display and debug LAPB and X.25
		Operation	Command
		Display interface information	display interface [ type number ]
		Display X.25 alias table	display x25 alias-policy
		Display X.25 hunt group information	display x25 hunt-group-info [
			hunt-group-name ]
		Display X.25 address mapping table	display x25 map
		Display X.25 switching route table	display x25 switch- vc-table svc
		Display X.25 switching virtual circuit table	display x25 switch-vc-table pvc
		Display X.25 virtual circuit	display x25 vc lci-number
		Enable X.25 information debugging	debugging x25 all [interface
			interface-type interface-number ]
		Enable X.25 event debugging	debugging x25 event [interface
			interface-type interface-number ]
		Enable X.25 packet debugging	debugging x25 packet [interface
			interface-type interface-number ]
		Enable XOT debugging	debugging x25 xot

Typical LAPB

Configuration

Example

I. Networking Requirement

Two routers are directly connected via serial ports with LABP protocol to transmit IP data packets directly.

II. Networking Diagram

Figure 67 Direct connection between two routers via serial ports

V.35 cable

Router A Serial 0 Serial 1 Router B

III. Configuration Procedure

As shown in the diagram above, perform the following configuration tasks:

1Configure Router A:

aSelect interface

[Router]interface serial 0

bSpecify IP address for this interface

[Router-Serial0]ip address 202.38.160.1 255.255.255.0

cConfigure the link layer protocol of the interface to LAPB and specify its working mode as DTE

[Router-Serial0]link-protocol lapb dte

dConfigure other Lapb parameters (if the link is of good quality, and a higher rate is required, the flow control parameter modulo can be increased to 128, k to 127, but they must be the same for both ends in the direct connection)