All MIBs › CTRON-Q-BRIDGE-MIB-EXT › ctDot1qPortDiscardTagged
ctDot1qPortDiscardTagged
Module: CTRON-Q-BRIDGE-MIB-EXT
OID (symbolic): CTRON-Q-BRIDGE-MIB-EXT::ctDot1qPortDiscardTagged
OID (numeric): 1.3.6.1.4.1.52.4.1.2.16.7.1.1.1.2
Node type: OBJECT-TYPE
Type: EnabledStatus
Access: read-write
Description: The method used to discard all incoming VLAN tagged frames for the port specified by the indexing of this entry.
When this is enabled(1), the device will discard all 802.1Q tagged packets received on this port.
When this is disabled(2), the device will NOT discard frames received on this port based on the presence of an 802.1Q tag.
The behavior of this method in conjunction with the dot1qPortAcceptableFrameTypes leaf of Q-BRIDGE-MIB [RFC2674] is that of a logical OR.
What is ctDot1qPortDiscardTagged?
This value controls whether the switch discards all incoming 802.1Q tagged frames received on the port, working as a logical OR alongside the standard dot1qPortAcceptableFrameTypes setting. An admin enables it on ports meant to carry only untagged access traffic, as a backwards-compatible way of rejecting any tagged frame that arrives there. For example, enabling this on a desktop access port causes the switch to drop any incoming VLAN-tagged frame outright, guarding against VLAN-hopping attempts from that port.
Examples
Walk all instances (SNMPv2c):
snmpwalk -v2c -c public <target> 1.3.6.1.4.1.52.4.1.2.16.7.1.1.1.2 snmpwalk -v2c -c public <target> CTRON-Q-BRIDGE-MIB-EXT::ctDot1qPortDiscardTagged
Get a specific instance (index 1):
snmpget -v2c -c public <target> 1.3.6.1.4.1.52.4.1.2.16.7.1.1.1.2.1 snmpget -v2c -c public <target> CTRON-Q-BRIDGE-MIB-EXT::ctDot1qPortDiscardTagged.1
Set instance 1 (SNMPv2c):
snmpset -v2c -c private <target> 1.3.6.1.4.1.52.4.1.2.16.7.1.1.1.2.1 s <value>
SNMPv3 example:
snmpget -v3 -l authPriv -u snmpv3-user -a SHA -A "AuthPassword1" -x AES -X "PrivPassword1" <target> ctDot1qPortDiscardTagged.1
Start monitoring Cabletron/Enterasys managed Ethernet switch (802.1Q VLAN extension) with a free 30-day trial of IPNetwork Monitor. Create custom SNMP monitor using the CTRON-Q-BRIDGE-MIB-EXT::ctDot1qPortDiscardTagged OID value, configure state conditions and alerts, and monitor any Cabletron/Enterasys managed Ethernet switch (802.1Q VLAN extension) from a single console.
OID Breakdown
Upper-level ancestors (11 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 |
| 1.3.6.1.4.1.52 | cabletron | Cabletron-MIB |
| 1.3.6.1.4.1.52.4 | mibs | CT-PRIORITY-QUEUING |
| 1.3.6.1.4.1.52.4.1 | ctron | CTRON-ISDN-CONFIGURATION-MIB |
| 1.3.6.1.4.1.52.4.1.2 | ctDataLink | CTRON-ISDN-CONFIGURATION-MIB |
| 1.3.6.1.4.1.52.4.1.2.16 | ctVlanExt | CTRON-MIB-NAMES |
| Numeric OID | Name | Module |
|---|---|---|
| 1.3.6.1.4.1.52.4.1.2.16.7 | ctQBridgeMibExt | CTRON-Q-BRIDGE-MIB-EXT |
| 1.3.6.1.4.1.52.4.1.2.16.7.1 | ctQBridgeMIBObjects | CTRON-Q-BRIDGE-MIB-EXT |
| 1.3.6.1.4.1.52.4.1.2.16.7.1.1 | ctDot1qPortVlanExtTable | CTRON-Q-BRIDGE-MIB-EXT |
| 1.3.6.1.4.1.52.4.1.2.16.7.1.1.1 | ctDot1qPortVlanEntry | CTRON-Q-BRIDGE-MIB-EXT |
| 1.3.6.1.4.1.52.4.1.2.16.7.1.1.1.2 | ctDot1qPortDiscardTagged | CTRON-Q-BRIDGE-MIB-EXT |