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Cisco BPX 8600 Series Installation and Configuration
Release 9.3.10, Part Number 78-11603-01 Rev. D0, July 2001
Chapter 25 Configuring SONET Automatic Protection System
APS 1 +1 Annex B Card and Line Redundancy
The user may add APS as long as the working and protection line are in the standby state. Lines and
trunks can only be upped after APS 1:1 is added.
Configuring APS 1:1
This is an example of configuring APS 1:1 redundancy:
Note Before configuring for APS 1:1 redundancy, all card connections must be deleted using
the delcon command
Step 1 Ensure that lines are connected, for example on ports 1 and 2 of a BXM in slot 3.
Note The last entry, “2”,intheaddapsln command specifies the type of APS, in this
example APS 1:1.
Step 2 Execute cnfcdaps and verify chan half= yes (not default), and standard= GR-253 (default)
cnfcdaps 3.1 Y 1
Step 3 addapsln 3.1 3.2 2 {addapsln<slot.port> <slot.port> <1|2|3|4|5>
Step 4 upln 3.1 {or uptrk,asapplicable
APS 1 +1 Annex B Card and Line Redundancy
The APS 1 +1 Annex B feature is similar to the APS 1+1 feature, with the main difference being that
APS 1+1 Annex B redundancy only can be configured for bi-directional operation and non-revertive
switching.
General Criteria
APS 1 + 1 Annex B can be configured only for bi-directional operation and non-revertive switching on
aline.
Note In non-revertive switching, to avoid data loss, a line is not automatically switched back to
active after a failure is corrected.
Configuring APS 1+1 Annex B
The following is an example of configuring APS 1+1 redundancy:
Step 1 Verify that appropriate front and back cards are installed along with APS two-card daughterboard.
Step 2 Ensure that lines are connected, for example port 1 on BXM in slot 1 and port 1 on BXM in slot 2.