Avaya Configuring SNMP, BOOTP, DHCP, and RARP Services Uživatelský manuál stáhnout pdf (Strana 34)

Configuring SNMP, BootP, DHCP, and RARP Services

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303542-A Rev 00

An SNMP community is a logical relationship between an SNMP agent and one

or more SNMP managers. You define communities locally at the agent. The agent

establishes one community for each desired combination of authentication and

access control characteristics. 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.

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.

SNMP Implementation Notes

This section contains information about features specific to the Bay Networks

implementation of SNMP.

Internet Protocol

SNMP uses the User Datagram Protocol (UDP) to transport its messages. You

must enable the Internet Protocol (IP) to use UDP and SNMP.

Events and Traps

An event is a change in the operating status of a router. The router stores the event

as a single entry in a memory-resident log.

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Avaya Configuring SNMP, BOOTP, DHCP, and RARP Services Uživatelský manuál Strana 34