The first task in configuring SNMPv3 is to define a view. To simplify things, we'll create a view that allows access to the entireinternetsubtree:
router(config)#snmp-server view readview internet included
This command creates a view calledreadview. If you want to limit the view to thesystem tree, for example, replaceinternetwithsystem. Theincludedkeyword states that the specified tree should be included in the view; useexcludedif you wanted to exclude a certain subtree.
Next, create a group that uses the new view. The following command creates a group calledreadonly;v3means that SNMPv3 should be used. Theauthkeyword specifies that the entity should authenticate packets without encrypting them;readreadviewsays that the view namedreadviewshould be used whenever members of thereadonlygroup access the router.
router(config)#snmp-server group readonly v3 auth read readview