All MIBs › SW-LAYER2-PORT-MANAGEMENT-MIB › swL2PortCtrlHOLState
swL2PortCtrlHOLState
Module: SW-LAYER2-PORT-MANAGEMENT-MIB
OID (symbolic): SW-LAYER2-PORT-MANAGEMENT-MIB::swL2PortCtrlHOLState
OID (numeric): 1.3.6.1.4.1.326.2.20.1.2.2.2.28.2.4.2.1.12
Node type: OBJECT-TYPE
Type: INTEGER
Access: read-write
Description: The object provides a way to prevent HOL (Head Of Line) blocking between ports. HOL protection may prevent forwarding a packet to a blocking port. The idea relies on the assumption that it is better to discard packets destined to blocking ports, then to let them consume more and more buffers in the input-port's Rx-counters because eventually these input ports may become totally blocked. The meanings of the values are: 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. disabled(2) - HOL function disable. enabled(3) - HOL function enable.
What is swL2PortCtrlHOLState?
Enables Head-of-Line blocking protection on this port, which lets the switch discard packets destined for a currently-blocked port rather than let them pile up and eventually clog the receiving port's own buffers - an admin enables it to protect overall switch throughput during localized congestion.
Examples
Walk all instances (SNMPv2c):
snmpwalk -v2c -c public <target> 1.3.6.1.4.1.326.2.20.1.2.2.2.28.2.4.2.1.12 snmpwalk -v2c -c public <target> SW-LAYER2-PORT-MANAGEMENT-MIB::swL2PortCtrlHOLState
Get a specific instance (index 1):
snmpget -v2c -c public <target> 1.3.6.1.4.1.326.2.20.1.2.2.2.28.2.4.2.1.12.1 snmpget -v2c -c public <target> SW-LAYER2-PORT-MANAGEMENT-MIB::swL2PortCtrlHOLState.1
Set instance 1 (SNMPv2c):
snmpset -v2c -c private <target> 1.3.6.1.4.1.326.2.20.1.2.2.2.28.2.4.2.1.12.1 i <value>
Start monitoring D-Link/Marconi ES2000-series Layer 2 switch (per-port link/control/statistics) with a free 30-day trial of IPNetwork Monitor. Create custom SNMP monitor using the SW-LAYER2-PORT-MANAGEMENT-MIB::swL2PortCtrlHOLState OID value, configure state conditions and alerts, and monitor any D-Link/Marconi ES2000-series Layer 2 switch (per-port link/control/statistics) from a single console.
OID Breakdown
Upper-level ancestors (15 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 |
| 1.3.6.1.4.1.326 | fore | COMMON-GOLF-MIB |
| 1.3.6.1.4.1.326.2 | systems | COMMON-GOLF-MIB |
| 1.3.6.1.4.1.326.2.20 | ethernet | COMMON-GOLF-MIB |
| 1.3.6.1.4.1.326.2.20.1 | edge | COMMON-GOLF-MIB |
| 1.3.6.1.4.1.326.2.20.1.2 | golf | COMMON-GOLF-MIB |
| 1.3.6.1.4.1.326.2.20.1.2.2 | golfcommon | COMMON-GOLF-MIB |
| 1.3.6.1.4.1.326.2.20.1.2.2.2 | fore_mgmt | COMMON-GOLF-MIB |
| 1.3.6.1.4.1.326.2.20.1.2.2.2.28 | es2000Mgmt | SW-COMMON-MIB |
| 1.3.6.1.4.1.326.2.20.1.2.2.2.28.2 | swL2Mgmt | SW-COMMON-MIB |
| Numeric OID | Name | Module |
|---|---|---|
| 1.3.6.1.4.1.326.2.20.1.2.2.2.28.2.4 | swL2PortMgmt | SW-LAYER2-PORT-MANAGEMENT-MIB |
| 1.3.6.1.4.1.326.2.20.1.2.2.2.28.2.4.2 | swL2PortCtrlTable | SW-LAYER2-PORT-MANAGEMENT-MIB |
| 1.3.6.1.4.1.326.2.20.1.2.2.2.28.2.4.2.1 | swL2PortCtrlEntry | SW-LAYER2-PORT-MANAGEMENT-MIB |
| 1.3.6.1.4.1.326.2.20.1.2.2.2.28.2.4.2.1.12 | swL2PortCtrlHOLState | SW-LAYER2-PORT-MANAGEMENT-MIB |