All MIBs › GIGAswitchEthernet-MIB › gsEPortFlowControlMode
gsEPortFlowControlMode
Module: GIGAswitchEthernet-MIB
OID (symbolic): GIGAswitchEthernet-MIB::gsEPortFlowControlMode
OID (numeric): 1.3.6.1.4.1.36.2.18.39.3.6.2.1.1.21
Node type: OBJECT-TYPE
Type: INTEGER
Access: read-write
Description: Flow control is used to prevent or reduce the dropping of frames due to the lack of buffer space. Overall, networks are more efficient when a sending station is asked to pause in its sending process, rather than having the transmitted frames dropped.
Flow control is not as efficient when used in conjunction with a shared ports, i.e. when used with a repeater. Therefore, flow control is not recommended for a port connected to shared topologies.
Flow control is most effective when the port is directly connected to an end-station, especially when connected to a server. Flow control is recommended for ports connected directly to end-stations.
When the port is in half-duplex mode, back pressure is used to control the incoming flow. Back pressure essentially forces collisions for short periods of time.
When the port is in full-duplex mode, IEEE 802.3 standard pause frames are used to control the incoming flow.
Note that setting an ether-gigabit(4) port to enable-with-aggressive-backoff(3) results in an error.
What is gsEPortFlowControlMode?
Controls 802.3x flow control on this port: full-duplex ports use standard PAUSE frames, half-duplex ports use back-pressure (forced collisions). Admins enable this on ports connected directly to servers/end-stations (where it's most effective) but avoid it on shared/repeater segments; setting enable-with-aggressive-backoff(3) on a gigabit port is rejected outright.
Examples
Walk all instances (SNMPv2c):
snmpwalk -v2c -c public <target> 1.3.6.1.4.1.36.2.18.39.3.6.2.1.1.21 snmpwalk -v2c -c public <target> GIGAswitchEthernet-MIB::gsEPortFlowControlMode
Get a specific instance (index 1):
snmpget -v2c -c public <target> 1.3.6.1.4.1.36.2.18.39.3.6.2.1.1.21.1 snmpget -v2c -c public <target> GIGAswitchEthernet-MIB::gsEPortFlowControlMode.1
Set instance 1 (SNMPv2c):
snmpset -v2c -c private <target> 1.3.6.1.4.1.36.2.18.39.3.6.2.1.1.21.1 i <value>
SNMPv3 example:
snmpget -v3 -l authPriv -u snmpv3-user -a SHA -A "AuthPassword1" -x AES -X "PrivPassword1" <target> gsEPortFlowControlMode.1
Start monitoring Digital Equipment Corporation (DEC) GIGAswitch/Ethernet chassis switch (legacy) with a free 30-day trial of IPNetwork Monitor. Create custom SNMP monitor using the GIGAswitchEthernet-MIB::gsEPortFlowControlMode OID value, configure state conditions and alerts, and monitor any Digital Equipment Corporation (DEC) GIGAswitch/Ethernet chassis switch (legacy) from a single console.
OID Breakdown
Upper-level ancestors (9 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 |
| 1.3.6.1.4.1.36 | dec | CMU-MIB |
| 1.3.6.1.4.1.36.2 | ema | DEC-ATM-CHASSIS-MIB |
| 1.3.6.1.4.1.36.2.18 | decMIBextension | DEC-ATM-CHASSIS-MIB |
| Numeric OID | Name | Module |
|---|---|---|
| 1.3.6.1.4.1.36.2.18.39 | gsEMIB | GIGAswitchEthernet-MIB |
| 1.3.6.1.4.1.36.2.18.39.3 | gsEChassis | GIGAswitchEthernet-MIB |
| 1.3.6.1.4.1.36.2.18.39.3.6 | gsEPorts | GIGAswitchEthernet-MIB |
| 1.3.6.1.4.1.36.2.18.39.3.6.2 | gsEPortFlowControlMgt | GIGAswitchEthernet-MIB |
| 1.3.6.1.4.1.36.2.18.39.3.6.2.1 | gsEPortFlowControlTable | GIGAswitchEthernet-MIB |
| 1.3.6.1.4.1.36.2.18.39.3.6.2.1.1 | gsEPortFlowControlEntry | GIGAswitchEthernet-MIB |
| 1.3.6.1.4.1.36.2.18.39.3.6.2.1.1.21 | gsEPortFlowControlMode | GIGAswitchEthernet-MIB |