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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.