Configuring An Sdlc Address For A Secondary Station - 3Com MSR 50 Series Configuration Manual

220 C 7: DLS C
HAPTER W
Configuring an SDLC
Address for a Secondary
Station
ONFIGURATION
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.
Follow these steps to configure an SDLC role:
To do...
Enter system view
Enter interface view
Configure an SDLC role
The SDLC protocol allows multiple virtual circuits to run on an SDLC physical link,
with one end connected to the primary station and the other end to a secondary
station. In order to distinguish different virtual circuits, you need to specify an
SDLC address for each virtual circuit. SDLC is an "unbalanced" protocol, a primary
station can be connected with multiple secondary devices through a multi-user
system or an SDLC switch, while the secondary devices cannot be connected with
one another. Therefore, the communication between the primary station and each
secondary station can be guaranteed as long as each secondary device is identified
with an SDLC address.
The following command is used to specify an SDLC address for a virtual circuit,
which is unique on a physical interface. The configured SDLC address on a
synchronous serial interface is actually the address of the secondary SDLC station.
On the serial interface of the DLSw router connected with the primary SDLC
station, you need to configure the address of each secondary SDLC station that
communicates with the primary station. On the serial interface of the DLSw router
connected with a secondary SDLC station, you need to configure the address of
each secondary SDLC station connected with the serial interface.
An SDLC address ranges from 0x01 to 0xFE. The SDLC address of a router is valid
on only one physical interface. That is, the SDLC addresses configured on different
interfaces may be the identical.
Follow these steps to configure an SDLC address:
Use the command...
system-view
interface interface-type
interface-number
sdlc status { primary |
secondary }
Remarks
-
-
Required
By default, no SDLC role is
configured.