Introduction Configuring the Forwarding Database
Software Reference for SwitchBlade x3100 Series Switches (Layer Two Switching)
4-6
The displayed switch settings are:
• Learning - Whether or not the switch's dynamic learning and updating of the Forwarding Database is
enabled; one of “ON” or “OFF”.
• Ageing Timer - Whether or not the ageing timer is enabled; one of “ON” or "OFF".
• Ageingtimer - The value in seconds of the ageing timer, after which a dynamic entry is removed from the
Forwarding Database.
• Age-Only FDB Clear:
• As displayed above, the attribute Age-Only FDB Clear is Off, which indicates that the default AGE-
ANDSTATE setting is currently ON.
• If the attribute Age-Only FDB Clear is On, the optional AGEONLY setting is currently ON.
• Number of SM Ports - The number of fixed switch downlink Line Card interfaces.
• Number of NM Ports - The number of switch uplink interfaces.
Note: The concept of NM and SM Ports does not apply to the SBx3112; it will be replaced with the term
Line Card in a future release.
• Number of HVLAN - The number of HVLANs in the switch.
• Number of Standard VLAN - The number of standard 802.1q VLANs in the switch.
• Number of UFO VLAN - The number of upstream forwarding-only VLANs in the switch. In a UFO VLAN,
the traffic from downstream interfaces is forwarded only to upstream interface(s). Also includes the type of
MACREMOVAL set for the system.
• Hash Select - The current hash selection setting.
4.2.9 Configuring the Forwarding Database
4.2.9.1 Default Configuration
By default, the Switch Learning and Ageingtimer are set to ENABLED, so the FDB is dynamically learned and
updated, and AGEINGTIMER determines when a dynamic entry is removed.
4.2.9.2 Restrictions and Limitations
When a learn limit is set on an interface and that limit is exceeded there is no log or trap sent. (This is different
than the feature for the iMAPs where an “FDB management overflow” log, a CARD046, and associated SNMP
trap would be generated.)
The SBx3112 supports a maximum 16K MAC address table size. If this learn limit is exceeded, those MAC
addresses (in excess of the 16K limit) are flooded.
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