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SecureStack will not accept Cos Settings: "Could not set the COS parameter

SecureStack will not accept Cos Settings: "Could not set the COS parameter

FAQ_User
Extreme Employee
Article ID: 10323

Products
SecureStack C5, C3, C2, B5, B3, B2

Changes
Issued the '
code:
set cos settings 
<
index
>
code:
priority...
' command.

Symptoms
The command was not accepted.
"Could not set the COS parameter"

For example:
    C3(rw)-
    >
    set cos settings 6 priority 6 tos-value 64
    Could not set the COS parameter
    C3(rw)-
    >
Cause
The Class of Service MIB (may be downloaded within mibs.zip) includes the following definition:

code:
iso.org.dod.internet.private.enterprises.enterasys.etsysMibs.etsysModules.etsysCosMIB.

code:
etsysCosObjects.etsysCos.etsysCosTable.etsysCosEntry.etsysCosIndex

code:
1.3.6.1.4.1.5624.1.2.55.1.3.5.1.1


code:
etsysCosIndex OBJECT-TYPE

code:
SYNTAX Unsigned Integer ( 0..32767 )

code:
MAX-ACCESS No Access

code:
STATUS Current

code:
DESCRIPTION


code:
A unique class of service identifier for this CoS setting.

code:
For reasons of backward compatibility indexes 0-7 MUST exist

code:
and be configured with a etsysCos8021dPriority which

code:
matches the etsysCosIndex.


code:
::= { etsysCosEntry 1 }


code:
MODULE ENTERASYS-CLASS-OF-SERVICE-MIB

code:
FILE
code:
enterasys-class-of-service-mib.txt

code:
PATH ftp://ftp.enterasys.com/pub/snmp/mibs


The command in question is defined as follows:
    set cos settings
    <
    Class of Service index 0-255
    >
    [priority
    <
    Priority 0-7 to be associated with the CoS
    >
    ]
    [tos-value
    <
    TOS Byte value 0-255 to be written for the CoS
    >
    ]
    [irl-reference
    <
    Inbound Rate Limiter 0-99 to be associated with the CoS
    >
    ]
When a CoS Index value within the range of 0-7 is used, then it may be treated as a Class of Service or as a Priority (a legacy 802.1p Priority has a value within the range of 0-7), because for this range these concepts are synonymous.

When a CoS Index value within the range of 8-255 is used, then it may be treated as a Class of Service which has a defined Priority value (0-7) associated with it.

When a CoS Index value within the range of 0-255 is used, then it may optionally be associated with a TOS Rewrite value and/or an Inbound Rate Limiter.

Solution/Workaround
FAD (Functions as Designed)

In order to avoid the stated cli error condition, it is necessary to
    Use a CoS Index value within the range of 0-7 only when it is desired that the resulting Priority match the index value; -and- When using a CoS Index value within the range of 0-7 do not specify a Priority value.
The solution for the example given above is to omit the Priority parameter:
    C3(rw)-
    >
    set cos settings 6 tos-value 64
    C3(rw)-
    >
Note that most often, NetSight Policy Manager - rather than the cli - is used to configure Policy and Class of Service.
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