EXTREME-FDB-MIB

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Organization: Extreme Networks, Inc.

Last Updated: 2000-10-31

Category: Technology: Switching/L2, VLAN and Bridging, Vendor: Extreme Networks

Description: Extreme Networks MIB for monitoring and managing the Layer 2 forwarding database (FDB/MAC address table) on ExtremeXOS switches.

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What Is EXTREME-FDB-MIB?

EXTREME-FDB-MIB is an Extreme Networks enterprise MIB for ExtremeXOS-based switches that exposes the Layer 2 forwarding database (FDB), i.e. the MAC address table, along with an associated IP FDB table mapping IP-to-MAC/port bindings. It belongs to the Ethernet switching/Layer 2 technology area and its data is operational/configuration state: learned MAC addresses, the VLAN and port on which each was learned, and static versus dynamic entries. It supports monitoring of device software status by revealing whether the FDB is learning and aging entries correctly, whether a MAC address has unexpectedly moved between ports (a sign of a loop or spoofing), or whether the table is nearing capacity. It parallels the standard BRIDGE-MIB (dot1dTpFdbTable) concept though implemented as an independent Extreme enterprise MIB. It is typically deployed on Extreme Networks ExtremeXOS switches in enterprise and data-center Layer 2 environments. Engineers can download the EXTREME-FDB-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in EXTREME-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

Extreme Networks ExtremeXOS switch

Monitoring Examples

No sample objects were supplied for this module, so exact table/object names cannot be confirmed; consistent with its description an administrator would poll the FDB table to determine which port and VLAN a given MAC address was learned on, watching for rapid re-learning of the same MAC on a different port (indicating a loop or flapping) or an IP FDB mismatch indicating an ARP/IP binding inconsistency.

What Can Be Monitored

learned MAC address table entries
MAC-to-port/VLAN mapping
IP FDB (IP-to-MAC) bindings
FDB entry aging/static status

Imported Objects

From EXTREME-BASE-MIB

PortList
extremeAgent	OBJECT-IDENTITY

From SNMPv2-SMI

Counter64
Integer32
IpAddress
MODULE-IDENTITY
OBJECT-TYPE

From SNMPv2-TC

DisplayString
MacAddress
RowStatus

How to Use in IPNetwork Monitor

Example using extremeFdbMacFdbCounterValue OID:

Select an Extreme Networks ExtremeXOS-based switch (Layer 2 forwarding database/MAC table) as the target host to create a monitor — the SNMP service should be up and running on it. Click New Monitor, then check SNMP Custom on the Favorites tab, click Next, and confirm the host. On the next page, click Select... to open the built-in SNMP MIB Browser and type extremeFdbMacFdbCounterValue into the Find box to locate it in the OID tree, selecting the specific row/instance you want to monitor since this is a table column, then select it and click OK. The count of the number of FDB changes for the given port since the counter was last reset. On the monitor's Main parameters page you can set the target's SNMP port (default 161), credentials, polling interval, and other settings — see the SNMP Monitor help for details. On the State conditions and Alerting tabs, configure when the monitor should change state and trigger an alert; since this is a Counter64-type OID, Value bounds is the most useful condition here — trigger an alert if the counter increases sharply between polls relative to its normal baseline, since an unexpected spike often reflects a real change in traffic or activity. Click Finish to create the monitor; you can adjust any parameter later.

OIDs

OID symbolic	OID numeric	Type	Access	Description
extremeFdb	1.3.6.1.4.1.1916.1.16			Extreme FDB and IP FDB tables.
extremeFdbMacFdbTable	1.3.6.1.4.1.1916.1.16.1		not-accessible	A table that contains information about the hardware MAC FDB table. Supported only for switches running on Extremeware.
extremeFdbMacFdbEntry	1.3.6.1.4.1.1916.1.16.1.1		not-accessible	An entry in the table of MAC FDB information.
INT extremeFdbMacFdbVlanIfIndex	1.3.6.1.4.1.1916.1.16.1.1.1	INTEGER	not-accessible	The ifIndex of the Vlan on which this mac is learned.
INT extremeFdbMacFdbSequenceNumber	1.3.6.1.4.1.1916.1.16.1.1.2	INTEGER	not-accessible	The sequence number of this FDB entry in the forwarding database.
MAC extremeFdbMacFdbMacAddress	1.3.6.1.4.1.1916.1.16.1.1.3	MacAddress	read-only	A MAC address for which the bridge has forwarding and/or filtering information.
INT extremeFdbMacFdbPortIfIndex	1.3.6.1.4.1.1916.1.16.1.1.4	INTEGER	read-only	Either the value '0', or the IfIndex of the port on which a frame having a source address equal to the value of the corresponding instance of dot1dTpFdbAddress has been seen. A value of '0' indicates that the port IfIndex has not been learned but that the bridge does have some forwarding/filtering information about this address (e.g. in the dot1dStaticTable).
INT extremeFdbMacFdbStatus	1.3.6.1.4.1.1916.1.16.1.1.5	INTEGER	read-only	The status of this entry. This is the value of dot1dTpFdbStatus in RFC1493.
extremeFdbIpFdbTable	1.3.6.1.4.1.1916.1.16.2		not-accessible	A table that contains information about the hardware IP FDB table.
extremeFdbIpFdbEntry	1.3.6.1.4.1.1916.1.16.2.1		not-accessible	An entry in the table of IP FDB information.
INT extremeFdbIpFdbSequenceNumber	1.3.6.1.4.1.1916.1.16.2.1.1	INTEGER	not-accessible	The sequence number of this entry in the IP FDB
IP extremeFdbIpFdbIPAddress	1.3.6.1.4.1.1916.1.16.2.1.2	IpAddress	read-only	The IP Address of the IP FDB entry
MAC extremeFdbIpFdbMacAddress	1.3.6.1.4.1.1916.1.16.2.1.3	MacAddress	read-only	The MAC address corresponding to the IP Address.
INT extremeFdbIpFdbVlanIfIndex	1.3.6.1.4.1.1916.1.16.2.1.4	INTEGER	read-only	The ifIndex of the Vlan on which this ip is learned
INT extremeFdbIpFdbPortIfIndex	1.3.6.1.4.1.1916.1.16.2.1.5	INTEGER	read-only	The IfIndex of the port on which this entry was learned
extremeFdbPermFdbTable	1.3.6.1.4.1.1916.1.16.3		not-accessible	This table contains information on the secure-mac permanent FDB entries. It may later be extended to display other types of permanent FDB entries.
extremeFdbPermFdbEntry	1.3.6.1.4.1.1916.1.16.3.1		not-accessible	An entry in the table of secure-mac permanent FDB information.
INT extremeFdbPermFdbFilterNum	1.3.6.1.4.1.1916.1.16.3.1.1	INTEGER	read-only	This object always returns 1. In future, it may be used to provide additional capability.
MAC extremeFdbPermFdbMacAddress	1.3.6.1.4.1.1916.1.16.3.1.2	MacAddress	read-only	The is the MAC Address to which this FDB entry pertains.
INT extremeFdbPermFdbVlanId	1.3.6.1.4.1.1916.1.16.3.1.3	INTEGER	read-only	The VLAN ID of the VLAN to which this FDB entry pertains.
POR extremeFdbPermFdbPortList	1.3.6.1.4.1.1916.1.16.3.1.4	PortList	read-create	This is the list of port(s) on which the given MAC Address is configured Note that this port list is constructed assuming there are as many ports per slot as given in the object extremeChassisPortsPerSlot. Thus, if extremeChassisPortsPerSlot is 128, then the 129th bit in the port list (reading left to right) indicates port 2:1. Similarly, the 256th bit would indicate port 2:128 while the 257th bit would indicate port 3:1. Note especially that the bit positions in port list do not depend on the actual physical presence or absence of the given ports on the blade or of any blade itself.
BIT extremeFdbPermFdbFlags	1.3.6.1.4.1.1916.1.16.3.1.5	Bits	read-create	This object contains the flags associated with the FDB entry. The flags are similar to those displayed on the device Command Line Interface. At present, only the isSecure bit i.e. bit 0 will be supported and it will always be ON since only secure-mac entries are configurable and displayed in this table.
ROW extremeFdbPermFdbStatus	1.3.6.1.4.1.1916.1.16.3.1.6	RowStatus	read-create	The status of this entry as per standard RowStatus conventions. Note however, that createAndWait and notInService states are not supported.
extremeFdbMacFdbCounterTable	1.3.6.1.4.1.1916.1.16.5		not-accessible	A table that contains change counters for the Operational FDB and ARP. Each entry in the table corresponds to an individual port. Whenever a change occurs to the operational FDB (MAC learned, aged out or removed) or in the IP ARP table (learned, aged out or removed) , the counter associated with the port is incremented by one. The counters are reset at agent startup and when the port is down. They are not cleared when the port is enabled or disabled.
extremeFdbMacFdbCounterEntry	1.3.6.1.4.1.1916.1.16.5.1		not-accessible	An entry in the table of MAC FDB change counters.
INT extremeFdbMacFdbCounterPortIfIndex	1.3.6.1.4.1.1916.1.16.5.1.1	INTEGER	not-accessible	The ifIndex of the Port for which the counte applies.
C64 extremeFdbMacFdbCounterValueEx	1.3.6.1.4.1.1916.1.16.5.1.2	Counter64	read-only	The count of the number of FDB changes for the given port since the counter was last reset.

RFC description

Manages hardware MAC and IP forwarding database entries on Extreme Networks switches.

Start monitoring Extreme Networks ExtremeXOS-based switch (Layer 2 forwarding database/MAC table) with a free 30-day trial of IPNetwork Monitor. Import MIBs, browse SNMP OIDs, create custom SNMP monitors, configure alerts, and monitor any SNMP-enabled network device from a single console.

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