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Cisco MGX 8850 Multiservice Switch Installation and Configuration
Release 1.1.31, Part Number 78-11223-03 Rev. B0, May 2005
Chapter 6 Card and Service Configuration
Processor Switching Module
As defined in GR-253, a variety of APS modalities are possible (see the command summaries that
follow).
APS Requirements
The current requirements for the APS service on an MGX 8850 shelf are:
• Redundant PXM1s (currently, the PXM1 does not support an APS configuration where the working
and protection lines are on the same uplink card).
• A “B” version of an OC-3 or OC-12 back card (SMLR-1-622/B, and so on).
• The connected network shelf or CPE must also support APS.
APS Configuration
Initial APS specification consists of the working and protection slot and line and the mode for APS. After
the initial APS specification, you can configure additional APS parameters, give commands for
switching lines, and display the APS configuration. The CiscoView application and CLI provide access
to the APS feature. For detailed descriptions of the CLI commands, refer to the Cisco MGX 8800 Series
Switch Command Reference. Note that APS is available for only the “B” versions of the SONET
cards—SMLR-1-622/B, and so on. The applicable CLI commands are
• addapsln to specify the lines and mode for APS
• cnfapsln to modify the following details of APS operation:
–
error thresholds
–
wait period before the PXM1 restores the working line after errors clear
–
unidirectional or bidirectional switchover, specifies whether one or both directions of a line are
switched when the criteria for a hard or soft failure are met for one direction
–
revertive recovery, where the working line automatically returns to operation after errors clear
and any wait period has elapsed
–
enable use of K1 and K2 bytes in the line-level frame for equipment at both ends to exchange
APS-related information
• delapsln to delete the APS configuration
• dspapsln to display the configuration for an APS-configured line
• switchapsln to issue commands for line switching that
–
clear previous user requests
–
lock out (block) line switching
–
manually switch to the protection line if the following are true: no errors exist, the working line
is active, and your request has an equal or higher priority than the last switch request.
–
force a line switch regardless of existing errors if the following are true: the working line is
active and your request has an equal or higher priority than the last switch request.
–
switch all traffic to either the working lines or protection lines so you can remove a card (applies
to only the currently supported configuration of 1+1 mode on two uplink cards).
To specify APS, use the following syntax: