All MIBs › CM-IP-MIB › cmIpInterfaceMTU
cmIpInterfaceMTU
Module: CM-IP-MIB
OID (symbolic): CM-IP-MIB::cmIpInterfaceMTU
OID (numeric): 1.3.6.1.4.1.2544.1.12.11.1.1.1.5
Node type: OBJECT-TYPE
Type: Integer32
Access: read-write
Description: IP Interface MTU.
What is cmIpInterfaceMTU?
This read-write object configures the maximum transmission unit, up to 1500 bytes, for this IP interface. Admins tune this value to avoid fragmentation or to match the MTU of an upstream link, since a mismatched MTU can cause dropped packets or performance issues. For example, if a device connects through a link that only supports smaller frames, like some PPPoE paths, an admin would lower this MTU accordingly to prevent fragmentation-related failures.
Examples
Walk all instances (SNMPv2c):
snmpwalk -v2c -c public <target> 1.3.6.1.4.1.2544.1.12.11.1.1.1.5 snmpwalk -v2c -c public <target> CM-IP-MIB::cmIpInterfaceMTU
Get a specific instance (index 1):
snmpget -v2c -c public <target> 1.3.6.1.4.1.2544.1.12.11.1.1.1.5.1 snmpget -v2c -c public <target> CM-IP-MIB::cmIpInterfaceMTU.1
Set instance 1 (SNMPv2c):
snmpset -v2c -c private <target> 1.3.6.1.4.1.2544.1.12.11.1.1.1.5.1 i <value>
SNMPv3 example:
snmpget -v3 -l authPriv -u snmpv3-user -a SHA -A "AuthPassword1" -x AES -X "PrivPassword1" <target> cmIpInterfaceMTU.1
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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 |
| 1.3.6.1.4.1.2544 | advaMIB | ADVA-MIB |
| 1.3.6.1.4.1.2544.1 | products | ADVA-MIB |
| 1.3.6.1.4.1.2544.1.12 | fsp150cm | ADVA-MIB |
| Numeric OID | Name | Module |
|---|---|---|
| 1.3.6.1.4.1.2544.1.12.11 | cmIPMIB | CM-IP-MIB |
| 1.3.6.1.4.1.2544.1.12.11.1 | cmIpObjects | CM-IP-MIB |
| 1.3.6.1.4.1.2544.1.12.11.1.1 | cmIpInterfaceTable | CM-IP-MIB |
| 1.3.6.1.4.1.2544.1.12.11.1.1.1 | cmIpInterfaceEntry | CM-IP-MIB |
| 1.3.6.1.4.1.2544.1.12.11.1.1.1.5 | cmIpInterfaceMTU | CM-IP-MIB |