3Com MSR 50, MSR 30 manual Sdlc status primary secondary, Undo sdlc status primary secondary

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Description Use the sdlc simultaneous command to configure the SDLC synchronous serial interface to work in two-way simultaneous mode, so that the primary SDLC station can send data to and receive data from a secondary station at the same time.

Use the undo sdlc simultaneous command to restore the default mode.

By default, the data transmission mode is “alternate”.

Example # Enable the two-way simultaneous mode for SDLC data on Serial 2/0.

<Sysname> system-view

[Sysname] interface serial 2/0

[Sysname-Serial2/0] sdlc simultaneous

sdlc status

Syntax	sdlc status { primary secondary }
	undo sdlc status { primary secondary }
View	Synchronous serial interface view
Parameter	primary: Specifies that the SDLC device connected to the router is “secondary”.
	secondary: Specifies that the SDLC device connected to the router is “primary”.
Description	Use the sdlc role command to configure a SDLC role.
	Use the undo sdlc role command to remove the configured SDLC role.
	By default, the device has no role.
	SDLC is an “unbalanced” link layer protocol. That is, the end systems across a TCP
	connection are not equal in the positions: one is primary and the other is
	secondary. The primary station, whose role is primary, plays a dominant role and
	controls the whole connection process. The secondary station, whose role is
	secondary, is controlled by the primary station. Therefore, we need to configure a
	role for an SDLC interface.
	In the SDLC role configuration, the role of an interface should be determined by
	the role of the SDLC device to which this router is connected:
	■ If the SDLC device connected with the local router has a role of primary, the
	local interface should be configured to have a role of secondary;
	■ If the SDLC device connected with the local router has a role of secondary, the
	local interface should be configured to have a role of primary.
	Generally, an IBM mainframe has a role of primary, while a terminal device such
	as a UNIX host or an Auto Teller Machine (ATM) has a role of secondary.