Basic Administration Protocols
206
Instruction Manual - NXA-ENET8-POE+
Perform these steps to set the PoE power budget for a port:
1.
Click
Administration
>
PoE
>
PSE
.
2.
Enable PoE power on selected ports. Set the priority and the power budget. And specify a time range during which PoE will be
provided to an interface.
3.
Click
Apply
.
Simple Network Management Protocol
Simple Network Management Protocol (SNMP) is a communication protocol designed specifically for managing devices on a
network. Equipment commonly managed with SNMP includes switches, routers and host computers. SNMP is typically used to
configure these devices for proper operation in a network environment, as well as to monitor them to evaluate performance or
detect potential problems.
Managed devices supporting SNMP contain software, which runs locally on the device and is referred to as an agent. A defined set
of variables, known as managed objects, is maintained by the SNMP agent and used to manage the device. These objects are
defined in a Management Information Base (MIB) that provides a standard presentation of the information controlled by the agent.
SNMP defines both the format of the MIB specifications and the protocol used to access this information over the network.
The switch includes an on-board agent that supports SNMP versions 1, 2c, and 3. This agent continuously monitors the status of
the switch hardware, as well as the traffic passing through its ports. A network management station can access this information
using network management software. Access to the on-board agent from clients using SNMP v1 and v2c is controlled by
community strings. To communicate with the switch, the management station must first submit a valid community string for
authentication.
Access to the switch from clients using SNMPv3 provides additional security features that cover message integrity, authentication,
and encryption; as well as controlling user access to specific areas of the MIB tree.
The SNMPv3 security structure consists of security models, with each model having it's own security levels. There are three
security models defined, SNMPv1, SNMPv2c, and SNMPv3. Users are assigned to groups that are defined by a security model and
specified security levels. Each group also has a defined security access to set of MIB objects for reading and writing, which are
known as views. The switch has a default view (all MIB objects) and default groups defined for security models v1 and v2c. The
following table shows the security models and levels available and the system default settings.
FIG. 234
Setting a Port’s PoE Budget
SNMPv3 Security Models and Levels
Model
Level
Group
Read View
Write View
Notify View
Security
v1
noAuthNoPriv
public (read only)
defaultview
none
none
Community string only
v1
noAuthNoPriv
private (read/write) defaultview
defaultview
None
Community string only
v1
noAuthNoPriv
userdefined
userdefined
userdefined
userdefined
Community string only
v2c
noAuthNoPriv
public (read only)
defaultview
none
none
Community string only
v2c
noAuthNoPriv
private (read/write) defaultview
defaultview
none
Community string only
v2c
noAuthNoPriv
userdefined
userdefined
userdefined
userdefined
Community string only
v3
noAuthNoPriv
userdefined
userdefined
userdefined
userdefined
A username match only
v3
AuthNoPriv
userdefined
userdefined
userdefined
userdefined
Provides user
authentication via MD5 or
SHA algorithms
v3
AuthPriv
userdefined
userdefined
userdefined
userdefined
Provides user
authentication via MD5 or
SHA algorithms and data
privacy using DES 56- bit
encryption