Optional Step: Defining Jumbo Frame Size - HP A7011A Installation Manual

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
Table 2-1 Network Card Configuration Worksheet
Required
Data Type
Optional
Station Built-in
address and
cannot be
changed
Link Optional
configuration
Link Optional
speed/duplex
mode
MTU Optional
(Maximum
Transmission
Unit): Jumbo
Frames
Receive flow Optional
control
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.
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.
Chapter 2
/ Default
As shown on
card
Autonegotiating
Autonegotiating
1518 Bytes
On
Where to
Example
Configure
not 0x0060b0c4012f
configurable
LANCP MC LANCP SET
DEVICE
/AUTONEGOTIA
TE
Hub or MC LANCP SET
a DEVICE/
switch or
SPEED=1000
LANCP
/FULL
LANCP MC LANCP SET
DEVICE/JUMBO
LANCP MC LANCP SET
DEVICE/FLOW
OpenVMS Installation
Installing the Adapter
Your System
15