Initiating A Topology Discovery - Juniper NETWORK AND SECURITY MANAGER 2010.2 - ADMINISTRATION GUIDE REV1 Administration Manual

Initiating a Topology Discovery

Copyright © 2010, Juniper Networks, Inc.
You can initiate network topology discovery in two ways.
Select (represented by a green arrow) from the Topology Manager toolbar.
Discover
NSM displays the network topology in whichever view you choose.
Select Preferences (represented by red check marks on a page) from the Topology
Manager toolbar. The Topology Manager Preferences window opens.
Select the
Refresh Intervals
1.
Check Run Topology discovery at regular intervals
2.
time of the day to run the discovery engine.
The other settings for a successful discovery are the default SNMP credentials and
optionally, the subnets to be included or excluded. You can adjust these settings in the
and
Default Credentials Preferred SubNets
window.
To ensure a successful topology discovery, it is recommended that you:
Use SNMP V1 or V2C versions.
Ensure that UDP ports from 50001 to 50010 are free because Topology Discovery also
uses these ports besides the standard SNMP UDP ports 161 and 162.
Ensure that the EX Series switches in the network run JUNOS Software EX 9.3R2 or
later.
Ensure that LLDP or LLDP-MED is enabled on all switches and switch ports, as well as
on all LLDP or LLDP-MED enabled devices such as IP Phones.
Ensure that the included subnets specified in Topology Manager preferences are
sufficient for all switches and routers and that they are SNMP enabled, in order that
the maximum number of links are discovered.
Check for NSM schema updates if some Juniper Networks devices are not discovered.
Expand the range of the included subnets and ensure that all relevant routers are SNMP
enabled if IP addresses for end-point devices connected to a switch are not discovered.
Devices could go undiscovered if the router is not SNMP enabled or is not included in
the subnets specified in the Topology Manager preferences.
The broadest subnet mask recommended is 255.255.240.0 for any included subnet.
The recommended limit of IP addresses in all included subnets put together is 15000.
The Topology Manager only discovers the product names of Juniper Networks devices.
IC devices (version 3.0r1 onwards) and SA devices (6.4r1 onwards) are supported.
Vendor identification for non-Juniper Networks devices is based on the SNMP enterprise
numbers registered with IANA. Therefore, it is possible that non-Juniper Networks
discovered devices may not reflect most recent ownership changes caused by mergers,
acquisitions or rebranding.
sub-tab.
and specify the interval or the
sub-tabs of the Topology Manager Preferences
Chapter 13: Topology Manager
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