All MIBs › POLICY-MIB › ipPolicyDiffServControlTrustedFields
ipPolicyDiffServControlTrustedFields
Module: POLICY-MIB
OID (symbolic): POLICY-MIB::ipPolicyDiffServControlTrustedFields
OID (numeric): 1.3.6.1.4.1.81.36.6.1.3
Node type: OBJECT-TYPE
Type: INTEGER
Access: read-write
Description: Specify which fields in the incoming packet might be trausted when the policy decision should be based in the incoming packet itself.
Policy decision depend on the active policy list. In cases that there is no active policy list or that the result of the active policy list is Permit, then the outgoing packet prioirty may be based on the incoming packet instead of an the user specification.
Trusting COS (802.1p) means that the outgoing packet prioirty (802.1p) should equal the incoming packet prioirty.
Trusting DSCP means that the outgoing packet prioirty (802.1p) should be taken from ipPolicyDiffServTable using the incoming packet DSCP value.
Trusting COS + DSCP means that both fields should be used. The behavior of the device when both COS + DSCP should be trusted is outside the scope of the current version of the MIB. (Note: P333R uses the max between incoming COS & DSCP-to-COS mapping)
Some devices might support only a subset of the values.
What is ipPolicyDiffServControlTrustedFields?
This selects which marking on an incoming packet the device trusts for setting outgoing priority when no active policy list denies the packet or none is active: the 802.1p CoS value, the DSCP value (the default, looked up in the DiffServ table), both, or untrust (neither). An admin sets this to dscp on a device where the DiffServ table is the source of truth for QoS marking, rather than trusting whatever CoS tag arrived on the wire.
Examples
Walk all instances (SNMPv2c):
snmpwalk -v2c -c public <target> 1.3.6.1.4.1.81.36.6.1.3 snmpwalk -v2c -c public <target> POLICY-MIB::ipPolicyDiffServControlTrustedFields
Get a specific instance (index 1):
snmpget -v2c -c public <target> 1.3.6.1.4.1.81.36.6.1.3.1 snmpget -v2c -c public <target> POLICY-MIB::ipPolicyDiffServControlTrustedFields.1
Set instance 1 (SNMPv2c):
snmpset -v2c -c private <target> 1.3.6.1.4.1.81.36.6.1.3.1 i <value>
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OID Breakdown
Upper-level ancestors (7 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 |
| Numeric OID | Name | Module |
|---|---|---|
| 1.3.6.1.4.1.81.36 | ipPolicyMgmt | POLICY-MIB |
| 1.3.6.1.4.1.81.36.6 | ipPolicyDiffServControlTable | POLICY-MIB |
| 1.3.6.1.4.1.81.36.6.1 | ipPolicyDiffServControlEntry | POLICY-MIB |
| 1.3.6.1.4.1.81.36.6.1.3 | ipPolicyDiffServControlTrustedFields | POLICY-MIB |