R21xx-HP FlexFabric 11900 Layer 2 LAN Switching Configuration Guide

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• When a crossover cable is used, set the interface to operate in the same MDIX mode as its peer, or
set either end to operate in AutoMDIX mode.
To set the MDIX mode of an Ethernet interface:
Ste
p
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 MDIX mode of the
Ethernet interface.
mdix-mode { automdix | mdi |
mdix }
By default, a copper Ethernet
interface operates in auto mode to
negotiate pin roles with its peer.
Testing the cable connection of an Ethernet interface
IMPORTANT:
• If the link of an Ethernet port is up, testin
g
its cable connection will cause the link to come down and then
go up.
• Fiber ports do not support this feature.
This feature tests the cable connection of an Ethernet interface and displays cable test results within five
seconds. The test results include the cable's status and some physical parameters. If any fault is detected,
the test results include the length of the faulty cable segment.
To test the cable connection of an Ethernet interface:
Step Command
1. Enter system view.
system-view
2. Enter Ethernet interface view.
interface interface-type interface-number
3. Test the cable connected to the Ethernet interface. virtual-cable-test
Configuring a Layer 3 Ethernet interface
Setting the MTU for an Ethernet interface
The value of maximum transmission unit (MTU) affects the fragmentation and reassembly of IP packets.
Generally, you do not need to modify the MTU of an interface. Due to the QoS queue length limit (for
example, the default length of an FIFO queue is 75), too small an MTU will result in too many fragments,
which will be discarded from the QoS queue. You can tune the MTU or QoS queue length.
To set the MTU for 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