Information Technology Reference
In-Depth Information
172.26.1.*:sub2::::::sub2:
Example 2: Valid Community Strings Entry
*.*.*.*:sub1::::::sub1:
172.26.1.*:sub2::::::sub2:
The first example is invalid because you have assigned different community strings to the same nested
address. CWSI Campus probably will overwrite the first entry with the second. However, unpredictable
results are also possible.
The second example is valid because 172.26.1.* is an address nested in the *.*.*.* address.
What Happens If I Enter an Invalid Write Community String?
If you accidentally enter an invalid write community string, you will still be able to discover the network
(provided that you entered a valid read-only community string). You will not be able to perform any
write actions until you enter a valid read-write string.
Working with Discovery
If you have experienced difficulty interpreting your discovered network, follow the suggestions in this
section for assistance with common problems.
Why Do Links Appear as Dashed Lines?
When a link between devices appears as a dashed line, it means that during the last discovery cycle,
CWSI Campus was incapable of doing a complete discovery of one of the devices at either end of the
link. This situation could happen if the link is inoperable for any reason, such as if the link was removed
from the network.
The most likely explanation for these dashed lines is an SNMP timeout. SNMP typically has the lowest
priority of the background processes for the Cisco device system. For example, SNMP can be affected
if you create a new VLAN because a spanning-tree recalculation occurs, which takes precedence over
SNMP.
You can lengthen the SNMP timeout for an individual device. To lengthen the timeout, follow these
steps:
Step 1
Select Edit; SNMP Communities from the CWSI Campus map window.
Step 2
Enter the community string using this syntax:
target:read:UNUSED:timeout:retries:UNUSED:UNUSED:write:
The default timeout is 3 seconds.
Step 3
If individual devices are configured with different community strings, enter new lines for each device.
Any changes made to the community strings take effect immediately.
Why Do Devices Appear with a Red X?
Devices with a red X on them are not being discovered properly. For any device to be discovered by
CWSI Campus, the following criteria must be met:
