Westermo U200 Operator manal - Manual (Page 25)

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9 Simple Network Management Protocol (SNMP)
The Westermo OnTime R/T200 switch supports Simple Network Management Protocol
version 2c (SNMPv2c).
SNMP is an Internet standard protocol (IP) developed to manage IP nodes (servers,
workstations, routers, switches and hubs etc.) on an Ethernet network. SNMP enables
network administrators and controls engineers to manage network performance, find and
solve network problems, and plan for network growth.
Devices or Ethernet Switches that support SNMP are usually referred to as Managed
Switches. There are currently three different versions of SNMP available; SNMPv1, SNMPv2
and SNMPv3. Any node on a network that must is managed incorporates an agent module
that is responsible for the following:
• Collecting and maintaining information about the local environment and network.
• Providing that information to a SNMP Master, either responding to a request or in an
unsolicited fashion, or, when an event the managed device has been configured to
monitor occurs.
• Responding to manager commands to alter the local configuration or operating
parameters.
Each agent on the network maintains a unique Management Information Base (MIB) that is
specific to the SNMP agent. This is the case with the Westermo OnTime switches. SNMP is
based on a standard that covers all type of devices. Some of the information is common
regardless of Switch manufacturer (Port Health , Port Status etc) while other information is
specific to the Switch Manufacturer (Switch temperature, No. of Satellites available etc).
The R/T200 MIB is divided into groups allowing the SNMP manager to poll the SNMP agents
for information. The following MIB groups are implemented:
• MIB-2 System Group, RFC1213-MIB, OID: 1.3.6.1.2.1.1. Contains generic
configuration information such as system description (switch type, software version),
location, hostname, etc on the switch CPU.
• MIB-2 Interface Group, RFC1213-MIB, OID: 1.3.6.1.2.1.2. Contains generic
information on the entities at the interface layer. This means port speed, switch MAC
address, and packets statistics (number of packets sent and received, number of
unicast and multicast, packet sizes, over- and undersized packets, CRC errors,
collisions, etc) per port on the switch.
• MIB-2 Internet Protocol Group (IP), RFC1213-MIB, OID: 1.3.6.1.2.1.4. Contains
information used to keep track of the IP layer on the switch CPU.
• MIB-2 Internet Control Message Protocol Group (ICMP), RFC1213-MIB, OID:
1.3.6.1.2.1.5. Contains 26 counters, counting how many times this message type was
generated by the local IP entity and how many times this message type was received
by the local IP entity. It also counts the total number of ICMP messages received,
sent, received in error, or not sent due to error on the switch CPU.