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Cisco ONS 15530 Configuration Guide and Command Reference
78-14227-01, Cisco IOS Release 12.1(10)EV2
Chapter7 Configuring APS
Configuring APS Group Attributes
Example
The following example shows how to display the path switching configuration for an APS group named
blue:
Switch# show aps group blue
APS Group blue:
architecture.: 1+1, remote prov: 1+1
span.........: end-to-end
prot. mode...: client side y-cable
direction....: prov: uni, current: uni, remote prov: uni
revertive....: yes, wtr: 300 secs (not running)
aps state....: enabled (associated)
request timer: holddown: 5000 ms, max: 15000 ms, count 2
msg-channel..: auto (up on osc)
created......: 4 days, 23 hours, 16 minutes
auto-failover: enabled
transmit k1k2: no-request, 0, 0, 1+1, uni
receive k1k2: no-request, 0, 0, 1+1, uni
switched chan: 0
protection(0): Transparent7/0/0 (STANDBY - UP), Wave7/0 (UP)
: channel request: no-request
: switchover count: 2
: last switchover: 3 days, 23 hours, 16 minutes
working...(1): Transparent4/0/0 (ACTIVE - UP), Wave4/0 (UP)
: channel request: no-request
: switchover count: 1
: last switchover: 4 days, 53 minutes
About Unidirectional and Bidirectional Path Switching
The Cisco ONS 15530 supports per-channel unidirectional and bidirectional 1+1 path switching. Wh en
a signal is protected and the signal fails or degrades on the active path, t he system automatically switches
the APS group from the active network path to the standby network path.
Signal failures can be total LOL (loss of light) caused by laser fail ur es, by fiber cu ts be tw een t he
Cisco ONS 1553 0 a nd t he c lien t e quipm ent , be twee n two Ci sco ONS 15530s, or by other e quip ment
failures. LOL failures on the transponder line cards and LOLK (loss of lock) on the 10-Gbps ITU trunk
cards and 10-GE uplink cards cause switchovers for protected signals.
For y-cable APS, you can also configure alarm thresholds to cause a switchover when the error rate
detected on the signal reaches an unacceptable level. For information about configuring alarm
thresholds, see the “Configuring Alarm Thresholds” section on page4-13.
The CiscoONS 15530 implements path switching using a SONET-compliant APS channel pr otocol over
the in-band message channel or the OSC (optical supervisory c han nel).
Note Bidirectional path switching operates only on networks that support the OSC or the in-band message
channel.