E3Switch WAN Monitor Operating Information Manual - page 11
Chapter 4: Remote Management HTTP and SNMP
color-coded HTTP screen. A screenshot is available at
www.e3switch.com
. Most settings that can be
modified via SNMP can also be set through the HTTP interface in a more user-friendly manner.
Refer to the configuration section of this document for guidance on specific settings.
Event Log File
A timestamped log of operating status and events may be accessed at the HTTP management administration
page.
Resetting
Two options for resetting the Monitor may be accomplished at the HTTP management administration page.
A management software reset will reset counters, statistics, MIB variables, and management software of the
Monitor without interrupting data flow on the WAN. A hardware reset will temporarily interrupt WAN
data flow as if the Monitor had experienced a power cycle. If upgrading firmware, for new functionality to
take effect a hardware reset is required after the upgrade but need not be initiated immediately. A software
reset is not appropriate after upgrading firmware, as only the management CPU would be reset while the
WAN packet transfer CPU would be operating with the older, incompatible version of firmware.
SNMP
The Monitor contains an SNMP agent which can respond to version 1 and version 2c requests for network
statistics from remote SNMP clients. The agent can also generate notifications of important network events
such as when network ports go up/down or experience high error rates. These trap notifications can be sent
to multiple hosts if desired, and using free or commercial software, the receiving hosts can log the
notifications or even generate email or pager messages for network managers.
SNMPv2c is inherently an insecure protocol, so the Monitor implements VACM to restrict access to “safe”
statistics and settings. Please refer to the security discussion section of this document.
SNMP configuration of various parameters such as community names and trap destinations is accessed
through the HTTP management interface and is implemented as a configuration file having an snmpd.conf
structure. Snmpd.conf is described by third parties in publicly available documents.
Statistics and settings accessible via SNMP are called MIB-variables and are organized in a hierarchical
tree topology. The MIB variable trees implemented by the Monitor include recent versions of the DS3/E3,
interface, MAU, dot3, and many of the typical IP-network MIB trees. The full list of MIB trees available is
listed by viewing the system.sysORTable of the Monitor. As mentioned earlier, access to certain trees or
variables is initially disabled for security reasons, but can be set as the user wishes through the VACM
settings. The Monitor can typically return 1000 MIB variables per second in bulk requests and support
SNMP response message sizes up to 5000 bytes.
Upgrading Firmware
For activation of additional capabilities of the Monitor, see the “Feature Activation” section. Feature
upgrades do not necessarily require a firmware upgrade.
Firmware upgrades may be transferred to the Monitor via the LAN port. A hardware reset, which will
interrupt link data flow for several seconds, will be required at some point after the transfer in order to
begin using the new firmware. Instructions for performing the TFTP transfer are included with all firmware
shipments. The most common source of problems when performing upgrades is attempting a TFTP transfer
in ASCII or text mode rather than binary or image mode.
Feature Activation/Upgrade
For activation of additional capabilities of the Monitor after initial purchase, supply the factory with the
serial number from the front of your Monitor (also shown at the HTTP management page for recent
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