Is there an attribute in Spectrum 10.1, which tells me the state (primary or secondary) of a WLC?

Document ID : KB000057285
Last Modified Date : 14/02/2018
Show Technical Document Details

QUESTION:  Is there an attribute in Spectrum 10.1, which tells me the state (primary or secondary) of a Wireless LAN Controller (WLC) model?

 

ANSWER: A SpectroWATCH can be created on the cRFStatusPrimaryMode attribute id 0x211b43 to determine if the if the model is the primary unit or not. The cRFStatusPrimaryMode attribute is defined as follows in the Cisco-RF-MIB:

cRFStatusPrimaryMode OBJECT-TYPE

    SYNTAX          TruthValue

    MAX-ACCESS      read-only

    STATUS          current

    DESCRIPTION

"Indicates whether this is the primary redundant unit or not. If this unit is the primary unit, this object is true. If this unit is the secondary unit, this object is false.

Note that the terms 'primary/secondary' are not synonymous with the terms 'active/standby'. At any given time, the primary unit may be the active unit, or the primary unit may be the standby unit. Likewise,   the secondary unit, at any given time, may be the active unit, or the secondary unit may be the standby unit.

The primary unit is given a higher priority or precedence over the secondary unit. In a race condition (usually at initialization time) or any situation where the redundant units are unable to successfully negotiate activity between themselves, the primary unit will always become the active unit and the secondary unit will fall back to standby. Only one redundant unit can be the primary unit at any given time.

The algorithm for determining the primary unit is system dependent, such as 'the redundant unit with the lower numeric unit id is always the primary unit.'"

 

ADDITIONAL INFORMATION: For information on creating a SpectroWATCH, please refer to the  "Working With Watches" section in the Spectrum 10.1 documentation.