OpenVMS Installation
Installing the Adapter
Chapter 2
15
The LAN device characteristics that can be set include speed, duplex mode, flow control, and whether
jumbo frames are enabled. The MC LANCP SET DEVICE and LANCP DEFINE DEVICE commands
modify these settings.
2. Set the desired characteristics according to the Network Configuration worksheet (see Table 2-1). For
example, use this command:
MC LANCP DEFINE DEVICE devname /SPEED=1000 /FULL /AUTONEGOTIATE
To make any configuration values permanent, enter the values in the LANCP permanent device database.
Optional Step: Defining Jumbo Frame Size
(Jumbo Frames Size (Jumbo frames are supported only at 1000 Mbit/s)
Jumbo frames for the LAN driver on OpenVMS V8.2 have an mtu_size in the range of 1518-8192 bytes.
Jumbo frames are enabled system-wide by setting bit 6 in the system parameter LAN_FLAGS. To enable
jumbo frames on individual devices, use the LANCP command SET DEVICE/JUMBO. To disable jumbo
frames, use the LANCP command SET DEVICE/NOJUMBO.
To preserve the setting of jumbo frames across boots, when using LANCP, define the setting in the LANCP
permanent device database, using the command DEFINE DEVICE/JUMBO.
Table 2-1
Network Card Configuration Worksheet
Data Type
Required
/
Optional
Default
Where to
Configure
Example
Your System
Station
address
Built-in
and
cannot be
changed
As shown on
card
not
configurable
0x0060b0c4012f
Link
configuration
Optional
Autonegotiating
LANCP
MC LANCP SET
DEVICE
/AUTONEGOTIA
TE
Link
speed/duplex
mode
Optional
Autonegotiating
Hub or
switch
a
or
LANCP
a. The speed configuration of the 1000Base-T can be 10, 100, or 1000 Mbps and is determined by the
speed setting of the hub or switch port to which the card is connected. The card automatically
senses this speed if autonegotiation is enabled. The card only runs at one speed at a time.
MC LANCP SET
DEVICE/
SPEED=1000
/FULL
MTU
(Maximum
Transmission
Unit): Jumbo
Frames
Optional
1518 Bytes
LANCP
MC LANCP SET
DEVICE/JUMBO
Receive flow
control
Optional
On
LANCP
MC LANCP SET
DEVICE/FLOW