No. Data
1 ID of the VLAN where MAC address flapping needs to be configured
2 Blocking time for the interface where MAC address flapping occurs
3 Number of detection attempts before an interface is permanently blocked
7.10.2 Configuring MAC Address Flapping Detection
After MAC address flapping detection is configured in a VLAN, the S7700 checks all MAC
addresses in the VLAN to detect MAC address flapping. When MAC address flapping occurs
on an interface, the S7700 blocks the interface, blocks the MAC address, or just reports a trap
according to the configuration.
Procedure
Step 1 Run:
system-view
The system view is displayed.
Step 2 Run:
vlan vlan-id
The VLAN view is displayed.
Step 3 Run:
loop-detect eth-loop { [ block-mac ] block-time block-time retry-times retry-times
| alarm-only }
MAC address flapping detection is configured in the VLAN.
When the S7700 detects MAC address flapping in the VLAN, it performs either of the following
actions:
l Block the interface or MAC address. When the block-mac keyword is used in the command,
the S7700 does not block the interface but blocks the traffic from the flapping MAC address.
l Send a trap to the network management system.
----End
7.10.3 (Optional) Unblocking a Blocked Interface or MAC Address
After an interface or a MAC address is permanently blocked because of MAC address flapping,
the interface or MAC address can be restored only by using the reset loop-detect eth-loop
command in the corresponding VLAN view.
Context
After MAC address flapping detection is configured in a VLAN, the system checks all MAC
addresses in the VLAN to detect MAC address flapping. If MAC address flapping occurs on an
interface, the system blocks the interface. After a specified period of time, the system unblocks
the interface. If no MAC address flapping is detected within 20 seconds, the system completely
Quidway S7700 Smart Routing Switch
Configuration Guide - Ethernet 7 MAC Address Table Configuration
Issue 01 (2011-07-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
365
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