Avaya Configuring BOOTP Services Manuel d'utilisateur télécharger pdf (Page 36)

Configuring SNMP, BootP, and DHCP Services

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308644-15.1 Rev 00

SNMP Communities

For security reasons, the SNMP agent validates each request from an SNMP

manager before responding to the request, by verifying that the manager belongs

to a valid SNMP community. An SNMP community is a logical relationship

between an SNMP agent and one or more SNMP managers (the manager software

implements the protocols used to exchange data with SNMP agents). You define

communities locally at the agent.

The agent establishes one community for each combination of authentication and

access control characteristics that you choose. You assign each community a

unique name (within the agent), and all members of a community have the same

access privileges, either read-only or read-write:

• Read-only: members can view configuration and performance information.

• Read-write: members can view configuration and performance information,

and also change the configuration.

By defining a community, an agent limits access to its MIB to a selected set of

management stations. By using more than one community, the agent can provide

different levels of MIB access to different management stations.

SNMP Community Managers

All SNMP message exchanges consist of a community name and a data field,

which contains the SNMP operation and its associated operands. You can

configure the SNMP agent to receive requests and send responses only from

managers that are members of a known community.

If the agent knows the community name in the SNMP message and knows that the

manager generating the request is a member of that community, it considers the

message to be authentic and gives it the access allowed for members of that

community. In this way, the SNMP community prevents unauthorized managers

from viewing or changing the configuration of a router.

For information about configuring SNMP managers see “Configuring SNMP

Community Managers” on page 3-13.

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Avaya Configuring BOOTP Services Manuel d'utilisateur Page 36