SW-FDB-MIB

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Category: Switch Management - D-Link

Description: Manages the switch forwarding database including MAC address entries, aging, and port associations.

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What Is SW-FDB-MIB?

SW-FDB-MIB is a switch forwarding-database module (vendor-generic naming, part of a shared proprietary switch MIB family) modeling the Layer 2 MAC address table, complementary to the standard IEEE 802.1D-derived BRIDGE-MIB forwarding database. It exposes learned MAC address entries along with their aging status and the switch port (and typically VLAN) each address is associated with. Its monitoring emphasis is software/data-plane state - tracking the number of learned MAC addresses, aging-timer behavior, and per-port MAC counts helps detect problems like MAC-table exhaustion (a common precursor to a MAC-flooding attack), port flapping, or an unexpected device appearing on a port. It overlaps in purpose with the standard BRIDGE-MIB's dot1dTpFdbTable, though implemented as a separate proprietary module. It is deployed on managed Ethernet switches for Layer 2 forwarding visibility, capacity planning, and security monitoring. Engineers can download the SW-FDB-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in SW-FDB-MIB. Use the built-in SNMP Monitoring Browser to explore available variables, view their current values and descriptions, and select the objects you want to monitor. You can then create SNMP monitors, configure thresholds, and receive alerts when monitored values change.

Supported Devices

D-Link ES2000 'Golf' series managed switch (Marconi enterprise OID branding)

Monitoring Examples

No concrete object or table names were provided for this module in the source excerpt, so specific identifiers can't be cited, but its purpose points to a forwarding-database table listing learned MAC addresses, their aging state, and the port/VLAN each is bound to. An administrator would monitor the total entry count and aging behavior to detect an unusually rapid growth in learned addresses, which often signals a MAC-flooding attack or a loop causing repeated re-learning. A MAC address unexpectedly appearing on the wrong port would similarly flag a misconfigured or rogue device on the network.

What Can Be Monitored

learned MAC address entries
MAC address aging status
MAC-to-port association
forwarding database entry count

Imported Objects

From RFC-1212

OBJECT-TYPE

From RFC1155-SMI

enterprises

OIDs

OID symbolic	OID numeric	Type	Access	Description
marconi	1.3.6.1.4.1.326
systems	1.3.6.1.4.1.326.2
external	1.3.6.1.4.1.326.2.20
dlink	1.3.6.1.4.1.326.2.20.1
dlinkcommon	1.3.6.1.4.1.326.2.20.1.1
golf	1.3.6.1.4.1.326.2.20.1.2
golfproducts	1.3.6.1.4.1.326.2.20.1.2.1
es2000	1.3.6.1.4.1.326.2.20.1.2.1.3
golfcommon	1.3.6.1.4.1.326.2.20.1.2.2
marconi_mgmt	1.3.6.1.4.1.326.2.20.1.2.2.2
es2000Mgmt	1.3.6.1.4.1.326.2.20.1.2.2.2.28
swL2Mgmt	1.3.6.1.4.1.326.2.20.1.2.2.2.28.2
swFDB	1.3.6.1.4.1.326.2.20.1.2.2.2.28.2.9
swFdbStaticTable	1.3.6.1.4.1.326.2.20.1.2.2.2.28.2.9.1		not-accessible	This table defines for frames with specific destincation MAC address, the set of ports that the frame will be forwarded to. Note that if a MAC address appears in this table also appears in the filter table, the filter table has higher priority over than this table. See swFdbFilterTable description.
swFdbStaticEntry	1.3.6.1.4.1.326.2.20.1.2.2.2.28.2.9.1.1		not-accessible	A list of information specifies which ports the frames with specific destination MAC address to go.
INT swFdbStaticVid	1.3.6.1.4.1.326.2.20.1.2.2.2.28.2.9.1.1.1	INTEGER	read-only	This object indicates the VLAN-ID. If the swVlanInfoStatus is port-base mode, the object ranges from 1 to 12. If VLAN is in mac-based mode or disabled, the object indicates the default VLAN-ID(0).
MAC swFdbStaticAddress	1.3.6.1.4.1.326.2.20.1.2.2.2.28.2.9.1.1.2	MacAddress	read-only	The MAC address which this forwarding entry applied. It can be an unicast address or a multicast address.
POR swFdbStaticPortMap	1.3.6.1.4.1.326.2.20.1.2.2.2.28.2.9.1.1.3	PortList	read-write	The set of ports to which frames received containing the value of swFdbStaticAddress as the DA, are allowed to be forwarded. Each octet within the value of this object specifies a set of eight ports, with the first octet specifying ports 1 through 8, the second octet specifying ports 9 through 16, etc. Within each octet, the most significant bit represents the lowest numbered port, and the least significant bit represents the highest numbered port. Thus, each port of the bridge is represented by a single bit within the value of this object. If that bit has a value of '1' then that port is included in the set of ports; the port is not included if its bit has a value of '0'.(Note that the setting of the bit corresponding to the port from which a frame is received is irrelevant.)
INT swFdbStaticState	1.3.6.1.4.1.326.2.20.1.2.2.2.28.2.9.1.1.4	INTEGER	read-write	This object indicates the status of this entry. other(1) - This entry is currently in use but the conditions under which it will remain so are different from each of the following values. invalid(2) - Writing this value to the object, and then the corresponding entry will be removed from the table. valid(3) - This entry is reside in the table.
INT swFdbStaticStatus	1.3.6.1.4.1.326.2.20.1.2.2.2.28.2.9.1.1.5	INTEGER	read-only	This object indicates the status of this entry. other(1) - This entry is currently in use but the conditions under which it will remain so are different from each of the following values. apply(2) - This entry is currently in use and reside in the table. not-apply(3) - This entry is reside in the table but currently not in use due to conflict with filter table.
swFdbStaticMemberTable	1.3.6.1.4.1.326.2.20.1.2.2.2.28.2.9.2		not-accessible	A list of information provide a different view for those ports where packets from the given Vlan need to be forwarded to.
swFdbStaticMemberEntry	1.3.6.1.4.1.326.2.20.1.2.2.2.28.2.9.2.1		not-accessible	A list of MIB capability entries supported by this forwarding static table.
INT swFdbStaticMemberVid	1.3.6.1.4.1.326.2.20.1.2.2.2.28.2.9.2.1.1	INTEGER	read-only	This object indicates the VLAN-ID. If the swVlanInfoStatus is port-base mode, the object ranges from 1 to 12. If VLAN is in mac-based mode or disabled, the object indicates the default VLAN-ID(0).
MAC swFdbStaticMemberAddress	1.3.6.1.4.1.326.2.20.1.2.2.2.28.2.9.2.1.2	MacAddress	read-only	The MAC address which this forwarding entry applied. It can be an unicast address or a multicast address.
INT swFdbStaticMemberUnitIndex	1.3.6.1.4.1.326.2.20.1.2.2.2.28.2.9.2.1.3	INTEGER	read-only	Specifies the unit ID where the port is located.
INT swFdbStaticMemberModuleIndex	1.3.6.1.4.1.326.2.20.1.2.2.2.28.2.9.2.1.4	INTEGER	read-only	Specifies the module ID where the port is located.
INT swFdbStaticMemberPortIndex	1.3.6.1.4.1.326.2.20.1.2.2.2.28.2.9.2.1.5	INTEGER	read-only	Specifies the port index relative to the module.
swFdbFilterTable	1.3.6.1.4.1.326.2.20.1.2.2.2.28.2.9.3		not-accessible	This table defines information for the device to filter packets with specific MAC address (either as the DA or as the SA). The MAC address can be a unicast address or a multicast address. This table has higher priority than both static FDB table and IGMP table. It means that if a MAC address appears on this table also appears on the static FDB table, the device will use the information provide by this table to process the packet.
swFdbFilterEntry	1.3.6.1.4.1.326.2.20.1.2.2.2.28.2.9.3.1		not-accessible	A list of information about a specific unicast/multicast MAC address for which the switch has filtering information.
INT swFdbFilterVid	1.3.6.1.4.1.326.2.20.1.2.2.2.28.2.9.3.1.1	INTEGER	read-only	This object indicates the VLAN-ID. If the swVlanInfoStatus is port-base mode, the object ranges from 1 to 12. If VLAN is in mac-based mode or disabled, the object indicates the default VLAN-ID(0).
MAC swFdbFilterAddress	1.3.6.1.4.1.326.2.20.1.2.2.2.28.2.9.3.1.2	MacAddress	read-only	This object indicates a unicast/multicast MAC address for which the bridge has filtering information.
INT swFdbFilterState	1.3.6.1.4.1.326.2.20.1.2.2.2.28.2.9.3.1.3	INTEGER	read-write	This object indicates the status of this entry. other(1) - This entry is currently in use but the conditions under which it will remain so are different from each of the following values. invalid(2) - Writing this value to the object, and then the corresponding entry will be removed from the table. valid(3) - Writing this value to the object, and then the corresponding entry will be added into the table. dst-src-addr(4) - Recieved frames's destination address or source address are currently used to be filtered as it meets with the MAC address entry of the table.
INT endOfMIB	1.3.6.1.4.1.326.2.20.1.2.2.2.28.9999	INTEGER	read-only

RFC description

Manages MAC address forwarding databases and filtering on D-Link ES2000 switches.

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Download SW-FDB-MIB

What Is SW-FDB-MIB?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description