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USER’S GUIDE
378 CyberSWITCH
1. Set up two systems in a back-to-back, dedicated, BRI scenario where at least one of the systems
is a PC-Platform. Configure a dedicated access between the 2 systems.
2. The usage of a PC-platform exploits the fact that the layer 1 of a PC-based BRI board stays
active even when you exit the software. This gives us a way to simulate an end-to-end B-
channel failure. That is, the only remaining way for the other system to detect the error is via
the Link Failure Detection mechanism (there are no D-channel failures or Layer 1 failures).
3. On the non-PC system (or either of the two if both are PC-platforms), make sure that Link
Failure Detection is enabled. Go to the
mc
screen to make sure that the dedicated connection is
up.
4. On the PC-platform system, enter the
quit
command.
5. On the non-PC system wait for approximately the amount time of the echo frequency
multiplied by the maximum attempts. At this time, the feature should detect the failure, and
the
mc
screen should remove the dedicated connection.
6. Check the log for the message which indicates that a link failure has been detected.
7. If there is a failure, refer to WAN Line Availability for corrective actions.
VERIFYING DHCP RELAY AGENT
The following sections provide instructions to verify that the DHCP/BOOTP Relay Agent is
working properly.
VERIFYING DHCP RELAY AGENT INITIALIZATION
Regardless of whether or not the Relay Agent has been enabled via configuration, some
initialization processing is always performed. If this initialization is successful, there should not be
any warnings/errors written to the report log by the DHCP Relay Agent.
1. Examine the report log. Type:
dr
<return>
2. The
dr
command displays the system report log. Look for any messages that begin with:
[DHCP-R]
3. The following messages indicate that errors occurred during DHCP/BOOTP Relay Agent
initialization processing:
[DHCP-R] Failed to allocated memory for transmit buffer pool
[DHCP-R] Relay Agent initialization failed
If you do not see either of these messages in the report log, the DHCP/BOOTP Relay Agent has
successfully performed its initialization processing.
If either (or both) of these messages are contained in the report log, refer to Relay Agent
Initialization in the Problem Diagnosis chapter.