3Com 10014299 manual Diagnosis, DLSw Fault, When using command display dlsw remote

400CHAPTER 25: CONFIGURING DLSW

	above example, c1 and c2 are the equipment of PU2.0 type, and c3 is the
	equipment of PU2.1 type.
Diagnosis and	The normal communication of DLSw requires the sound coordination between the
Troubleshooting of	two SNA equipments and two routers operating DLSw, which participate in the
DLSw Fault	communication. Problem in the co-ordination between any of the two points is
	likely to result in failure in connection.
	Fault 1: TCP channel can not be created. The status shown is DISCONNECT
	when using command display dlsw remote.
	Creating TCP channel is the first step for the successful connection of DLSw. If TCP
	connection can't be established, the problem lies between the two routers.
	Generally, the problem is the configuration of IP address of the router. You can
	check if the IP address of remote-peer is accessible by the ping command with the
	source address. Also you can use display ip routing-table command to see if there
	is any route to the network segment. TCP connection can be created once both
	parties have established correct routes.
	Fault 2: circuit can not be created correctly. To display dlsw circuits, the
	virtual circuit can't attain CONNECTED state.
	There are many causes that circuit can't be created. First of all, please make sure
	that TCP connection to the opposite end is successfully established. If TCP
	connection can be established successfully, while circuit can' t be created, this is
	generally caused by the problem in the coordination of the router and SNA
	equipment, mainly the problem of SDLC configuration.
	Firstly, open the debugging switch of SDLC to observe if the SDLC interface can
	receive and send messages successfully. You can use display interface command to
	observe the condition of receiving and sending messages on the interface. If the
	messages can't be received and sent correctly, it is generally because something is
	wrong with the encoding mode of the interface, baud rate or clock configuration.
	Generally, this can be solved by modifying the interface configuration parameter
	of the router or adjusting the configuration parameter of SDLC equipment.
	If the messages can be received and sent correctly, please check if the
	configuration PU type is correct. You can use sdlc xid command to configure XID,
	changing the setup of PU type.
	If the messages can be received and sent correctly, you can check with display dlsw
	circuits verbose command to see if the virtual circuit can enter into CIRCUIT_EST
	status. If CIRCUIT_EST is not accessible all the time, it suggests that something is
	wrong with the coordination between the MAC address and the partner
	configured. Generally, this can be solved by modifying configuration parameters
	such as sdlc partner.
	If circuit can attain CIRCUIT_EST state, but can not attain CONNECTED state, it
	suggests that the SDLC configuration of the router and the configuration of SNA
	equipment are not matching. Check the configuration of SDLC equipment on
	both ends and the configuration of the router to see if the configuration of the
	XID of SNA equipment (PU2.1) and the configuration of XID of the router (PU2.0)
	are correct. If nothing is wrong with the configuration, check the SDLC line on the