Configuring An Sdlc Virtual Mac Address; Configuring The Properties Of An Synchronous Serial Interface - 3Com MSR 50 Series Configuration Manual

222 C 7: DLS C
HAPTER W ONFIGURATION
Configuring an SDLC
Virtual MAC Address
n
Configuring the
Properties of an
Synchronous Serial
Interface
To do...
Enter interface view
Configure an SDLC XID sdlc xid sdlc-address
Initially designed for LLC2 protocols, DLSw establishes mappings with virtual
circuits through MAC addresses. Therefore, a MAC address must be specified for
an SDLC virtual circuit so that SDLC frames can be forwarded. Use the following
command to assign the current interface a virtual MAC address on an interface,
which will serve as the source MAC address during the conversion of SDLC frames
to LLC2 frames.
Follow these steps to configure an SDLC virtual MAC address:
To do...
Enter system view
Enter interface view
Configure an SDLC virtual
MAC address
Note that the sixth byte of the MAC address should be set to 0x00. The system will
combine the first five bytes of this virtual MAC address with the SDLC address into
a new MAC address, which will serve as the source MAC address in SDLC-to-LLC2
frame format conversion.
In practice, there are many types of SNA devices which differ from one another
significantly. The following commands are used to tune some commonly used
parameters to ensure the compatibility among different devices.
Configure the encoding scheme of the synchronous serial interface
■
There are two encoding schemes, NRZI and NRZ, for synchronous serial interface.
The NRZ encoding scheme is generally used for synchronous serial interfaces of
routers. The serial interfaces of some SNA devices, however, use the NRZI
encoding scheme. Therefore, the encoding scheme of routers should be changed
according to the encoding schemes used on the connected devices.
Configure the idle-time encoding scheme of the synchronous serial interface
■
While most SDLC devices use "0x7E" (flags) to indicate "idle" space between
frames, some other SDLC devices use "0xFF" (marks) for this indication. For
compatibility with different types of devices, you can configure the router to send
either flags (default) or marks to indicate its idle state.
Follow these steps to configure the properties of the synchronous serial interface:
Use the command...
interface interface-type
interface-number
xid-number
Use the command...
system-view
interface interface-type
interface-number
sdlc mac-map local
mac-address
Remarks
-
Optional
By default, no SDLC XID is configured
on a synchronous serial interface.
Remarks
-
-
Optional
No virtual MAC address by
default