General Criteria; Configuration Criteria; Figure 26-6 Sonet Aps 1:1 Detail - Cisco BPX-BXM-155-8DX Installation And Configuration Manual

Chapter 26 Configuring SONET Automatic Protection System

Figure 26-6 SONET APS 1:1 Detail

Tx
Rx
To set up APS, the addapsln command is used.
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General Criteria

APS 1:1 cannot be configured on cards already configured for YRED. They cannot be configured
concurrently. Use APS 1 + 1 instead.
APS 1:1 configuration requires that the user add the APS configuration to a line before upping the line.
APS 1:1 configuration requires that the user down a line prior to deleting the APS configuration on the
line.
APS 1:1 can only be configured for bi-directional operation and revertive switching.

Configuration Criteria

The redundant lines must be adjacent. In addition, the lines which may be paired are:
Either of the two lines may be designated as working line and the other as the protection line.
The switching of the working and protection lines is controlled by BXM firmware/hardware under the
APS protocol.
The BPX firmware/hardware performs switching between the protection and working lines in the event
of a line or port failure.
Release 9.3.0, Part Number 78-10674-01 Rev. D0, July 2001
Xcvr
Xcvr
Before the addapsln is used, the switch software will not attempt to use or monitor the protection
line; only the working line is used.
If the addapsln command is used with a working line in place, the working line is always initially
selected.
– 1 and 2
– 3 and 4
– 5 and 6
– 7 and 8
Working line
Xcvr
Xcvr
Protection line
Cisco BPX 8600 Series Installation and Configuration
APS 1:1 (Line Redundancy)
Rx
Tx
26-11