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Cisco MGX 8850 (PXM1E/PXM45), Cisco MGX 8950, Cisco MGX 8830, and Cisco MGX 8880 Configuration Guide
Release 5.0.10, OL-3845-01 Rev. B0, August 16, 2004
Chapter 3 Provisioning PXM1E Communication Links
General PXM1E Configuration Procedures
Tip
If the upln command fails for a line that requires a field replaceable unit (FRU) transceiver, enter the
dsplns command and verify that the Line Type column for the specified line has an entry that indicates
what type of FRU transceiver is installed. If no transceiver is installed, the line cannot be brought up.
Step 4
To verify that a line has been brought up, enter the following command:
mgx8830b.2.PXM.a >
dsplns
The line state column shows whether each line is up or down as shown in the following example:
mgx8830b.2.PXM.a >
dsplns
Medium Medium
Sonet Line Line Line Frame Line Line Valid Alarm APS
Line State Type Lpbk Scramble Coding Type Intvls State Enabled
------------- ----- ------------ ------ -------- ------ -------- ------ ------- -------
2.1 Adj APS Up sonetSts3c NoLoop Enable NRZ ShortSMF 72 Clear Enable
2.2 Down sonetSts3c NoLoop Enable NRZ ShortSMF 0 Clear Disable
2.3 Up sonetSts3c NoLoop Enable NRZ ShortSMF 72 Clear Disable
2.4 Down sonetSts3c NoLoop Enable NRZ ShortSMF 0 Clear Disable
2.1
Up sonetSts3c NoLoop Enable NRZ ShortSMF 72 Clear Enable
The line state represents the administrative intent for the line. For example, a line is reported as Down
until an administrator brings up the line. Once the administrator brings up the line, the line state remains
Up until the administrator brings the line down with the dnln command.
The alarm state indicates whether the line is communicating with a remote switch. When the alarm state
is reported as Clear, the physical devices at each end of the line have established physical layer
communications.
Configuring Lines
All line types are brought up with a default configuration. When configuring trunks between switches,
you can accept the defaults for each line and thus minimize configuration time. If you modify line
characteristics, make sure the parameter values are the same at both ends of the line.
Use the cnfln command to modify a line’s configuration.
describes the parameters you can
configure for each line type, and the following subsections describe how to enter the cnfln command for
each line type.
Table 3-2
Parameters for cnfln Command
Parameter
Line Types
Supported
Description
AIScBitsCheck
T3
The -cb option defines C-bit checking. Set <AIScBitsCheck>
to 1 to enable C-bit checking. Set it to 2 to ignore the C-bit.
bay.line
T1
E1
T3
E3
SONET
Replace bay with 2 to specify that the line is connected to a
PXM1E back card in the uplink bay.
Replace line with the number that corresponds to the line you
want to configure.
