The purpose of this page is to help you get started
using the Switch Port Mapping Tool.
Getting Started with the Managed Switch Port Mapping
Tool.
This procedure is found in greater detail in the program's
help file. Please refer to it by pressing the F1 key from within the
program. Locate the Getting Started section in the help file index.
Entering the target
switch information
Please press Settings in the Switch
Group. Then enter the IPv4 address
of the switch in the IP Address field. Select the SNMP version you
wish to use and enter the credentials (community name or press the
SNMP v3 Settings button to define the SNMPv3 credentials).
Entering other required
information
The switch will return information about
the devices connected to its ports, but it returns only MAC addresses.
We have to query other devices to obtain the IPv4 addresses associated
with those MAC addresses by getting the ARP tables.
1. We can query two other devices via SNMP for their ARP
tables. These ARP tables may contain the associations we are looking
for. A good place to start is with a router. Enter the IP address, then
the community name for each device. Leave the fields blank if you do
not have other devices to query.
2. We recommend leaving 'Query
Switch ARP Table' and 'Query Local ARP Table' checked because the switch
or your computer may have the IP to MAC associations we are looking
for. We also recommend leaving Enable Ping Sweep checked -- please verify
the IP range in Setup and make sure that Query Local ARP Table is checked.
3. If you want the IP addresses
resolved to hostnames, check the 'Resolve IPs to Hostnames' checkbox.
Running the switch query
Press Map Ports to begin the process. Once
complete the Map Ports and Setup buttons will no longer be 'grayed out'
and a report will be launched for viewing in your default web browser.
You can right click within the results grid to see additional options
like printing.
Troubleshooting
- If you get no response from the
switch, you will see no rows or columns populated in the grid
and a timeout message will appear. Check to make sure the switch
has SNMP enabled and verify that the access credentials you have
for reading information from the switch is correct. If your switch
has a permitted IP list, you may need to add your IP address to
that list. Make sure your personal firewall is allowing UDP traffic
on port 161 to travel BOTH ways.
- If you have a Dell switch and
the MAC address/IP address/Hostname/Interface columns are blank,
you probably have an older switch operating system that needs
to be updated from Dell's support website.
- You are not seeing IP addresses
associated with the MAC addresses. You need to put a device
like a file server or router (running SNMP) into the Primary or
Secondary so you can access the device's ARP table. This table is
required to map MAC addresses to IP addresses.
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