RAD Data comm E1/T1 Manuel d'utilisateur télécharger pdf (Page 210)

Appendix C SNMP Management FCD-IPM Installation and Operation Manual

C-4 SNMP Environment

with it, and the access rights associated with each community (this is the SNMP

community name table of the entity).

In general, SNMP agents support two types of access rights:

• Read-only − the SNMP agent accepts and processes only SNMP getRequest

and getNextRequest commands from management stations which have a

read-only community name.

• Read-write − the SNMP agent accepts and processes all the SNMP commands

received from a management station with a read-write community name.

SNMP agents are usually configured to send traps to management stations

having read-write communities.

Authentication

In accordance with the SNMP protocol, the SNMP community of the originating

entity is sent in each message.

When an SNMP message is received by the addressed entity, first it checks the

originator's community: messages with community names not included in the

SNMP community names table of the recipient are discarded (SNMP agents of

managed entities usually report this event by means of an authentication failure

trap).

The SNMP agents of managed entities evaluate messages originated by

communities appearing in the agent's SNMP Community Names table in

accordance with the access rights, as explained above. Thus a setRequest for an

MIB object with read-write access rights will nevertheless be rejected if it comes

from a management station whose community has read-only rights with respect to

that particular agent.

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RAD Data comm E1/T1 Manuel d'utilisateur Page 210