SNMP Communities

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SNMP Communities

A community is a group of hosts running the SNMP Service to which they all belong. These usually consist of at least one management system and multiple agents. The idea is to logically organize systems into organizational units for better network management. Figure 15.6 illustrates SNMP communites.

Communities are called by a community name. This name is case sensitive. The default community name is public and generally all hosts belong to it. Also by default, all SNMP agents respond to any request using the community public name. By using unique community names, however, you can provide limited security and segregation of hosts.

Agents do not accept requests nor respond to hosts that are not from their configured community. Agents can be members of multiple communities at the same time, but they must be explicitly configured as such. This enables them to respond to different SNMP managers from various communities.

In this example, two separate communities are defined: CommA and CommB. Only the managers and agents that are members of the same community can communicate.

Agent1 can send and receive messages to Manager1 because they are both members of the CommA community.
Agent2 and Agent3 can send and receive messages to Manager2 because they are all members of the CommB community.
Agent4 can send and receive messages to Manager1 and Manager2 because Agent4 is a member of the CommA and CommB communities.

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