R3166-R3206-HP High-End Firewalls Network Management Configuration Guide-6PW101

12
Configuring a Layer 3 Ethernet interface or subinterface
Layer 3 Ethernet interface or subinterface configuration task list
Complete these tasks to configure Layer 3 Ethernet interfaces or subinterfaces:
Task Remarks
Setting the MTU for an Ethernet interface or
subinterface
Optional
Applicable to Layer 3 Ethernet interfaces and
subinterfaces
Configuring link change suppression interval on an
Ethernet interface
Optional
Applicable to Layer 3 Ethernet interfaces
Configuring loopback testing on an Ethernet interface
Optional
Applicable to Layer 3 Ethernet interfaces
Setting the MTU for an Ethernet interface or subinterface
The MTU affects the fragmentation and re-assembly of IP packets.
Follow these steps to set the MTU for an Ethernet interface or subinterface:
To do… Use the command…
Remarks
Enter system view system-view —
Enter Ethernet interface
view/Ethernet subinterface view
interface interface-type
{ interface-number |
interface-number.subnumber }
—
Set the MTU mtu size
Optional
1500 bytes by default
NOTE:
Due to the QoS queue length limit (for example, the default len
g
th 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 increase
MTU or QoS queue length properly. In Ethernet interface view, you can use the qos fifo queue-length
command to change the QoS queue length. For more information, see the chapter “QoS.”
Configuring link change suppression interval on an Ethernet interface
An Ethernet interface operating in Layer 3 mode has two link layer states: up and down. During the
suppression time, link-layer-state changes will not be propagated to the system. Only after the
suppression time has elapsed will the system be notified of the link-layer-state changes by the link layer.
This functionality reduces the extra overhead occurred due to frequent link-layer-state changes within a
short period of time.
Follow these steps to set the link change suppression interval on an Ethernet interface:
To do… Use the command…
Remarks
Enter system view system-view —
Enter Ethernet interface view
interface interface-type
interface-number
—