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Document No. 10-300077, Issue 2 5-9
Configuring SNMP
Process The proxy forwarder process is as follows:
1. An NMS prepares an SNMPv3 request PDU. This PDU contains the
switch security credentials, including the engine ID and context name of
the ATM Uplink module.
2. The supervisor modules receives the PDU from the NMS. It verifies that
the security information matches the credentials of the switch. When the
supervisor detects an engine ID and context name that differ from those
of the switch, it checks the snmpProxyTable for a match.
3. The switch uses the information in the snmpProxyTable (and, because
the indicated target is an SNMPv1 agent, the snmpCommunityTable) to
convert the PDU to an SNMPv1 PDU and then send it to the ATM
Uplink module.
4. The ATM Uplink module receives and processes the PDU and sends its
response to the supervisor module.
5. The supervisor module matches the response to its pending forwarded
requests, converts the SNMPv1 PDU to an SNMPv3 PDU, and
forwards it to the NMS.
Accessing the
ATM-Uplink
Module
If an SNMPv3 user is assigned to a group that has read-only access to a
view, he or she can view the ATM-Uplink module OIDs. However, for an
SNMPv3 user to modify the ATM-Uplink module OIDs:
■ The user must be assigned to a group that provides write access to a
view.
AND
■ The view must include the promModuleTable.
For an SNMPv1 or v2 community string to access the ATM-Uplink module,
you must create a string specifically for that module and assign it read-only
or read-write access. For information on how to create a community string
for the ATM-Uplink module, see “Creating or Modifying a Community
String for the ATM-Uplink Module.”
Initial SNMPv3 User and SNMPv3 Administrator
Initial User When you upgrade the switch from v5.x application software to v6.x, an
initial SNMPv3 user is automatically created. The user name is initial, and
it is assigned to the predefined group initial. The initial group has read-only
access to the restricted view.
This initial user is created so that you can create new users by using SNMP.
To create new users, you can clone the initial user. For more information on
cloning a user, see RFC 3414.