When I try to start the intelligent agent I am getting an errorlike this.LSNRCTL for IBM/AIX RISC System/6000: Version 8.1.7.0.0 - Production on 15-APR-5

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Welcome to LSNRCTL, type "help" for information.

LSNRCTL> dbsnmp_start

LSNRCTL> dbsnmp_status

The db subagent is not started.

Please give a solution for this.
Rgds,
bvg