Cisco BPX 8650, Installation And Configuration Manual

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Cisco BPX 8600 Series Installation and Configuration
Release 9.3.30, Part Number 78-12907-01 Rev. E0, May 2005
Chapter 25 Configuring SONET Automatic Protection System
APS 1+1 (Card and Line Redundancy)
Figure 25-5 SONET APS 1+1 Detail
To set up APS, the addapsln command is used in the following scenarios:
• The addapsln command defines which line is working and which is protection.
•
Before you can execute the addapsln command for a line pair, the protection line must be in the
standby state.
•
If the addapsln command is executed, the working line is always initially selected.
When no port on a BXM is configured for APS, each back card of the pair may be used independently
by independent front cards. The switch software disallows configuration of APS if independent usage is
detected. There must be no active lines on the card that is selected to be the secondary card.
With previous card cages, because of the positioning of mechanical dividers, the APS card pairs can only
be inserted in certain slots. These are slots 2 through 5 and 10 through 13. The mechanical dividers are
located at slots 1 and 2, 5 and 6, 9 and 10, and 13 and 14.
With current card cages, this limitation is removed, and the APS card pairs can be located anywhere,
except BCC cards slots 7 and 8, and ASM card slot 15.
An APS 1+1 redundant card pair must be in adjacent slots (2,3 or 4,5 and so on).
APS 1+1 Redundancy Criteria
To implement the APS 1+1 redundancy, use the following procedure.
Step 1
Set up Y-redundancy
Step 2 Then add APS
Ensure that these requirements are met:
• The two BXM front cards reside in the same two adjacent slots as the APS back cards
•
The APS back cards are inserted into the APS redundant backplane assembly.
•
The working lines on the back card must be connected to the same slot as the primary front card
•
The protection lines connected to the same slot as the secondary front card.
Xcvr
Xcvr
Rx
Tx
Rx
Tx
Xcvr
Xcvr
Working line
Protection line
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