Chapter 6 Using Device Center
Enabling Debugging Tools
6-6
User Guide for CiscoWorks Common Services
78-16571-01
Checking Device Connectivity
To troubleshoot problems with un-managed or non-responding devices, you can
check the device connectivity by protocol. The Management Station to Device
tool helps you diagnose Layer 4 (application) connectivity problems.
Layer 4 tests include the key services Essentials needs to manage network
devices: debugging and measurement tools (UDP and TCP), the web server
(HTTP), file transfer (TFTP), the terminal (Telnet), and read-write access
(SNMP).
If a hostname is entered instead of an IP address, the program always does a name
lookup to find out the address. The test will fail if it cannot find an address.
You can test:
•
UDP (echo test, port 7)
Sends an echo request to UDP port 7.
•
TCP (echo test, port 7)
Sends an echo request to TCP port 7.
•
HTTP (availability test, port 80)
Sends an HTTP request to the HTTP port 80 of the destination device.
•
TFTP (availability test, port 69; device must be configured as a TFTP server)
Sends a TFTP request to the TFTP port (69) of the destination device.
•
Telnet (service test, port 23)
Checks whether Telnet is enabled on the device and if the destination device
responds to a Telnet request. It does not verify that the Telnet password in the
database works.
Since Telnet runs on top of TCP, when Telnet succeeds, it means TCP is
enabled on the device. If Telnet fails, there is no way to automatically
determine if TCP is enabled or not. Perform a TCP test to check whether TCP
is up or not.
