Allied Telesis SwitchBlade x3100 Series User Manual

Clearing the Forwarding Database (FDB) Introduction
4-5
Software Reference for SwitchBlade x3100 Series Switches (Layer Two Switching)
4.2.6.2 Duplicate Addresses on Intra-card Interface
If a duplicate MAC address is detected on an intra-card interface in a very short period of time, the following
actions occur:
• The interface is learning disabled immediately (there is no one-second timer or 128 limit). Packets
received will continue to forward.
• The Line Card sends a message to the CFC to inform the FDB Management system that the interface has
been disabled because of MAC Thrash Limiting.
• The interface will stay in a learning disabled state for 60 seconds.
4.2.7 Clearing the Forwarding Database (FDB)
There are two ways in which an address can be cleared from the switch FDB.
The contents of the FDB can be manually cleared by using the CLEAR SWITCH FDB command:
• VLAN or HVLAN - The VID Identifier for the VLAN or HVLAN.
• MAC Address - The MAC address as learned from the source address field of a frame. Example:
00:0C:25:00:13:8C
• Interface - The interface from which the MAC address was learned.
Alternatively, there is an option to have the MAC addresses remain in the FDB after the interface fails. MAC
addresses can be dynamically removed from the FDB by using the following command:
SET SWITCH MACREMOVALMODE={AGEONLY|AGEANDSTATE}
The default setting, AGEANDSTATE, removes dynamic FDB entries upon regular ageing time-outs and on
interface out-of-service state changes.
The optional setting, AGEONLY, removes dynamic FDB entries upon regular ageing time-outs but does not
remove them on interface out-of-service state changes.
4.2.8 Viewing Switch Settings
The SHOW SWITCH command displays configuration information for the switch functions.
officer SEC>> show switch
--- Switch Configuration -------------------
Learning.............................. On
Ageing Timer.......................... On
Ageingtimer........................... 300
Age-Only FDB Clear.................... Off
Number of SM Ports.................... 96
Number of NM Ports.................... 4
Number of HVLAN....................... 0
Number of Standard VLAN............... 1
Number of UFO VLAN.................... 0
Hash Select .......................... ALL
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Allied Telesis SwitchBlade x3100 Series Specifications

General

Brand	Allied Telesis
Model	SwitchBlade x3100 Series
Category	Switch
Language	English