To prevent network flapping caused by changes of VLANIF interface status, enable VLAN
damping on the VLANIF interface. After the last Up port in a VLAN goes Down, the system
starts a delay timer and informs the corresponding VLANIF interface of the VLAN Down event
after the timer expires. If a port in the VLAN goes Up during the delay period, the VLANIF
interface remains Up.
Procedure
Step 1 Run:
system-view
The system view is displayed.
Step 2 Run:
interface vlanif vlan-id
The VLANIF interface view is displayed.
The VLAN ID specified in this command must be the ID of an existing VLAN.
Step 3 Run:
damping time delay-time
The delay for VLAN damping is set.
The delay-time value ranges from 0 to 20, in seconds. By default, the value is 0 seconds,
indicating that VLAN damping is disabled.
----End
3.4.5 (Optional) Setting the MTU of a VLANIF Interface
Context
NOTE
l After changing the maximum transmission unit (MTU) by using the mtu command on a specified
interface, you need to restart the interface to make the new MTU take effect. To restart the interface,
run the shutdown command and then the undo shutdown command, or run the restart command in
the interface view.
l If you change the MTU of an interface, you need to change the MTU of the peer interface to the same
value by using the mtu command; otherwise, services may be interrupted.
l To ensure availability of Layer 3 functions, set the MTU value of the VLANIF interface to be smaller
than the maximum length of frames on the physical interface in the corresponding VLAN.
Procedure
Step 1 Run:
system-view
The system view is displayed.
Step 2 Run:
interface vlanif vlan-id
The VLANIF interface view is displayed.
Step 3 Run:
Quidway S7700 Smart Routing Switch
Configuration Guide - Ethernet 3 VLAN Configuration
Issue 01 (2011-07-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
89
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