All MIBs › MODULES-MIB › fethPortShortEvents
fethPortShortEvents
Module: MODULES-MIB
OID (symbolic): MODULES-MIB::fethPortShortEvents
OID (numeric): 1.3.6.1.4.1.81.12.6.1.1.1.19
Node type: OBJECT-TYPE
Type: Counter
Access: read-only
Description: This counter is incremented by one for each CarrierEvent on this port with ActivityDuration less than ShortEventMaxTime. ShortEventMaxTime is 84 bits (21 nibbles).
Note: shortEvents may indicate externally generated noise hits which will cause the repeater to transmit Runts to its other ports, or propagate a collision (which may be late) back to the transmitting DTE and damaged frames to the rest of the network.
Implementors may wish to consider selecting the ShortEventMaxTime towards the lower end of the allowed tolerance range to accommodate bit losses suffered through physical channel devices not budgeted for within this standard.
Note also that clause 27 repeaters do not perform fragment extension as clause 9 repeater does. REFERENCE Reference IEEE Draft Std 802.3u/D4 Rptr Mgt, 30.4.3.1.9, aShortEvents. Reference IETF 100Base-T Repeater MIB, rptr100MonitorPortShortEvents.
What is fethPortShortEvents?
Counts very short carrier bursts on this port, below the roughly 84-bit ShortEventMaxTime threshold, which typically indicate external electrical noise hitting the line rather than genuine traffic; it's the fast-Ethernet analog of the pygmy/short-event counters seen elsewhere, useful for spotting a noisy cable plant.
Examples
Walk all instances (SNMPv2c):
snmpwalk -v2c -c public <target> 1.3.6.1.4.1.81.12.6.1.1.1.19 snmpwalk -v2c -c public <target> MODULES-MIB::fethPortShortEvents
Get a specific instance (index 1):
snmpget -v2c -c public <target> 1.3.6.1.4.1.81.12.6.1.1.1.19.1 snmpget -v2c -c public <target> MODULES-MIB::fethPortShortEvents.1
Start monitoring Legacy multi-protocol Ethernet/token-ring hub or concentrator chassis with a free 30-day trial of IPNetwork Monitor. Create custom SNMP monitor using the MODULES-MIB::fethPortShortEvents OID value, configure state conditions and alerts, and monitor any Legacy multi-protocol Ethernet/token-ring hub or concentrator chassis from a single console.
OID Breakdown
Upper-level ancestors (8 from the standard OID tree / other modules)
| Numeric OID | Name | Module |
|---|---|---|
| 1 | iso | LANART-AGENT |
| 1.3 | org | AirPair-MIB |
| 1.3.6 | dod | AirPair-MIB |
| 1.3.6.1 | internet | AirPair-MIB |
| 1.3.6.1.4 | private | AirPair-MIB |
| 1.3.6.1.4.1 | enterprises | AirPair-MIB |
| 1.3.6.1.4.1.81 | lannet | GEN-MIB |
| 1.3.6.1.4.1.81.12 | eth | LANNET-MIB |
| Numeric OID | Name | Module |
|---|---|---|
| 1.3.6.1.4.1.81.12.6 | feth | MODULES-MIB |
| 1.3.6.1.4.1.81.12.6.1 | fethPort | MODULES-MIB |
| 1.3.6.1.4.1.81.12.6.1.1 | fethPortTable | MODULES-MIB |
| 1.3.6.1.4.1.81.12.6.1.1.1 | fethPortEntry | MODULES-MIB |
| 1.3.6.1.4.1.81.12.6.1.1.1.19 | fethPortShortEvents | MODULES-MIB |