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When you define a message that the interface sends, you must monitor receipt of
that message at the remote end.
When you define a message that the interface expects to receive, you should configure
the remote device to transmit the same message to the interface. You can then use
the show controllers sonet command to compare the expected and receive messages.
You must remove trace messages before you can change the port type from SONET
to SDH or vice versa. Otherwise, you see the following error message:
% Cannot set port mode (path trace message is set)
path overhead j1
Monitoring SONET/SDH Interfaces
You can monitor interface statistics and APS/MSP settings.
NOTE: The E120 and E320 routers output for monitor and show commands is
identical to output from other E Series routers, except that the E120 and E320 routers
output also includes information about the adapter identifier in the interface specifier
(slot/adapter/port).
Monitoring Interface Statistics
You can set statistics baselines for the section, line, and path layers using the baseline
interface sonet commands.
Use to define messages that the router sends to or expects to receive from a
SONET/SDH device connected to one of its SONET interfaces.
Do not specify a path identifier for unchannelized SONET interfaces.
Specify the keyword msg for a message that the router transmits for this path.
Specify the keyword exp-msg to define a message that the router expects to
receive on this path.
Define a message of up to 62 characters for SONET or up to 15 characters for
SDH.
Configure the remote device to send the same message that the router expects
to receive on this path. You can then compare the expected and received
messages in the display of the show controllers sonet command.
Example for unchannelized SONET interfaces:
host1(config-controller)#path overhead j1 msg hello
Use the no version to restore the default situation, in which all the characters in
the transmitted or expected message are zeros.
See path overhead j1.
Chapter 3: Configuring Unchannelized OCx/STMx Interfaces
Monitoring SONET/SDH Interfaces
97
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