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Cisco Router and Security Device Manager 2.5 User’s Guide
OL-4015-12
Chapter 6 Edit Interface/Connection
Connectivity Testing and Troubleshooting
Cisco SDM cannot troubleshoot unencapsulated Ethernet connections, Serial and
T1 or E1 connections, Analog connections, and ISDN connections. Cisco SDM
provides basic ping testing for these connection types.
What is Basic Ping Testing?
When Cisco SDM performs basic ping testing, it does the following:
1. Checks the interface status to see if it is up or down.
2. Checks DNS Settings, whether they be Cisco SDM default options or
user-specified hostnames.
3. Checks for DHCP and IPCP configurations on the interface.
4. Exits interface test.
5. Pings the destination.
Cisco SDM reports the results of each of these checks in the Activity/Status
columns. If the ping succeeds, then the connection will be reported as successful.
Otherwise the connection is reported down, and the test that failed is noted.
How does Cisco SDM Troubleshoot?
When Cisco SDM troubleshoots a connection, it performs a more extensive check
than the basic ping test. If the router fails a test, Cisco SDM performs additional
checks so it can provide you with the possible reasons for failure. For example, if
Layer 2 status is down, Cisco SDM attempts to determine the reason(s), reports
them, and recommends actions you can take to rectify the problem. Cisco SDM
performs the following tasks:
1. Checks interface status. If the Layer 2 protocol is up, Cisco SDM goes to step
2.
If Layer 2 protocol status is down, Cisco SDM checks ATM PVC status for
XDSL connections, or PPPoE status for encapsulated Ethernet connections.
–
If the ATM PVC test fails, Cisco SDM displays possible reasons for the
failure and actions you can take to correct the problem.
–
If the PPPoE connection is down, there is a cabling problem, and Cisco
SDM displays appropriate reasons and actions.
After performing these checks, the test is terminated and Cisco SDM reports
the results and suggests actions.