Extreme Networks EPICenter 6.0, Reference Manual

Page: 63 / 580

Discovering Network Devices
EPICenter Reference Guide
63
Note that there are certain IP addresses that are reserved. You should not include these addresses in
your discovery.
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Class A networks: 0 and 127 are reserved.
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Class D networks: 224 - 239 are reserved for multicasting.
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All addresses above 239 are reserved.
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255 is reserved for broadcast datagrams for either the host or network portion of the IP address.
In addition, certain host addresses may be interpreted as broadcast addresses, depending on the
subnetting of your network.
IP addresses are processed prior to starting the discovery, and IP addresses that contain 255’s in the
host portion are eliminated. This is based on the IP address as well as the subnet mask.
The following examples show how the various wild-card specifications can be used to specify
various IP address ranges:
3 Click the New button to add the range into the Device Discovery Criteria list.
4 Repeat steps 3 through 6 to specify any additional device addresses or ranges for the discovery.
5 When you have finished entering your discovery criteria, click the Discover button at the bottom of
the window to initiate the discovery.
The buttons in the middle and at the bottom of the page have the following functions:
SNMP Read Community Specify (or verify) the SNMP Read Community string so that
EPICenter
can
retrieve information from any SNMP version 1 devices it discovers.
Enable SNMP V3 Discovery Select Enable SNMP V3 Discovery if devices on your network use SNMP version 3.
SNMP Timeout Specify the length of time to wait for an SNMP request to complete when
attempting to contact the devices within the discovery range. Value can be
between 100 and 300000 milliseconds, with 100 being the default. This setting
affects only the current discovery criteria entry; you can set this value
independently for each criteria setting in the Discovery Criteria list.
IP Address Specification Addresses Generated
10.203.0.* polls 10.203.0.0 through 10.203.0.255
10.203.?.?? polls 10.203.0.0 through 10.203.9.99
10.203.0.1? or 10.203.0.10-19 both specify the same range: 10.203.0.10 through 10.203.0.19
10.203.0-2.10-30 polls
10.203.0.10 through 10.203.0.30
10.203.1.10 through 10.203.1.30
10.203.2.10 through 10.203.2.30
New Adds the current Device Discovery Options specified in the top part of the dialogue box to the
Device Criteria List
Remove Removes a selected row from the Device Discovery Criteria List.
Reset Clears the Device Discovery Criteria List.
Close Closes the Discover Devices Dialogue box.
Discover Initiates the discovery based on the specifications in the Device Discovery Criteria List.