R21xx-HP FlexFabric 11900 Layer 2 LAN Switching Configuration Guide

5
Configuring jumbo frame support
An Ethernet interface might receive some frames larger than the standard Ethernet frame size (called
"jumbo frames") during high-throughput data exchanges, such as file transfers. Usually, an Ethernet
interface discards jumbo frames. Jumbo frame support allows the interface to process jumbo frames
within the specified range.
To configure jumbo frame support in interface view:
Step Command Remarks
1. Enter system view.
system-view
N/A
2. Enter Ethernet interface
view.
interface interface-type
interface-number
N/A
3. Configure jumbo frame
support.
jumboframe enable [ value ]
By default, the switch allows jumbo
frames within 9216 bytes to pass
through Ethernet interfaces.
If you set the value argument multiple
times, the most recent configuration
takes effect.
Configuring physical state change suppression on an Ethernet
interface
The physical link state of an Ethernet interface is either up or down. Each time the physical link of a port
goes up or comes down, the interface immediately reports the change to the CPU. The CPU then notifies
the upper-layer protocol modules (such as routing and forwarding modules) of the change for guiding
packet forwarding, and automatically generates traps and logs, informing the user to take
corresponding actions.
To prevent frequent physical link flapping from affecting system performance, configure physical state
change suppression to suppress the reporting of physical link state changes. The system reports physical
layer changes only when the suppression interval expires.
To configure physical state change suppression on an Ethernet interface:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter Ethernet
interface view.
interface interface-type
interface-number
N/A
3. Set the link-down
event suppression
interval.
link-delay delay-time
By default, each time the physical link of a port
goes up or comes down, the interface immediately
reports the change to the CPU.
With this command configured, when the
interface comes down, the link-down event is not
reported to the CPU until the interface is still down
when the suppression interval (delay-time) expires.
When the interface goes up, the link-up event is
immediately reported.