Allied Telesis AT-S62 - Manual (Page 379)

AT-S62 Management Software Menus Interface User’s Guide
Section III: SNMPv3 379
In addition, you can define a MIB view that the user can access or a MIB
view that the user cannot access. When you want to permit a user to
access a MIB view, you include a particular view. When you want to deny
a user access to a MIB view, you exclude a particular view.
After you specify a MIB Subtree view you have the option of further
restricting a view by defining a Subtree Mask. The relationship between a
MIB Subtree View and a Subtree Mask is analogous to the relationship
between an IP address and a subnet mask. The switch uses the subnet
mask to determine which portion of an IP address represents the network
address and which portion represents the node address. In a similar way,
the Subtree Mask further refines the Subtree View and enables you to
restrict a MIB view to a specific row of the OID MIB table. Naturally, you
need a thorough understanding of the OID MIB table to define a Subtree
Mask.
SNMPv3 Storage
Types
Each SNMPv3 table entry has its own storage type. You can choose
between NonVolatile storage which allows you to save the table entry or
Volatile storage which does not allow you to save an entry. If you select
the Volatile storage type, when you power off the switch your SNMPv3
configuration is lost and cannot be recovered.
At each SNMPv3 menu, you are prompted to configure a storage type.
You do not have to configure the same storage type value for each table
entry.
SNMPv3 Message
Notification
When you generate an SNMPv3 message from the switch, there are three
basic pieces of information included in the message:
ˆ The type of message
ˆ The destination of the message
ˆ SNMP security information
To configure the type of message, you need to define if you are sending a
Trap or Inform message. Basically, the switch expects the authoritative
entity (or NMS) to respond to an Inform message. The switch does not
expect the authoritative entity to respond to a Trap message. These two
message types are defined in the SNMPv3 (RFC 2571-6).
To determine the destination of the message, you configure the IP address
of the host. This configuration is similar to the SNMPv1 and SNMPv2c
configuration.
The SNMP security information consists of information about the following:
ˆ User
ˆ View of the MIB Tree
ˆ Security Level