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14-9
Cisco 10000 Series Router Software Configuration Guide
OL-2226-23
Chapter 14 Configuring Automatic Protection Switching
Single-router Automatic Protection Switching
Monitoring and Maintaining the MR-APS Configuration
To monitor and maintain the configuration of MR-APS, enter any of the following commands in
privileged EXEC mode:
Caution Because debugging output is assigned high priority in the CPU process, it can render the system
unusable. For this reason, use debug commands only to troubleshoot specific problems or during
troubleshooting sessions with Cisco Systems technical support personnel. Moreover, it is best to use
debug commands during periods of lower network traffic and fewer users. Debugging during these
periods decreases the likelihood that increased debug command processing overhead will affect system
use.
Single-router Automatic Protection Switching
The Cisco 10000 series router supports SONET Single-router Automatic Protection Switching
(SR-APS) redundancy for the OC-3 ATM, OC-12 ATM, OC-12 POS, 6-port OC-3 POS, channelized
OC-12, and channelized 4-port STM-1 line cards. The following types of SR-APS are supported:
• SR-APS 1+1 support for line cards with a single port (such as the OC-12 POS) is card-to-card. When
the active line card fails, the redundant line card takes over.
• SR-APS 1:1 support for line cards with multiple ports (such as the OC-3 POS) is port-to-port. The
PRE transmits data to both the active and the redundant line card. When a port fails on the active
line card, the corresponding port on the redundant line card takes over. In addition to port failovers,
multiple port line cards support line card failover. If the working card fails, the protect card becomes
active and all ports on that card are active.
Command Purpose
Router# show aps
Displays about APS-configured interfaces.
Router# debug aps
Displays debugging information related automatic protection
switching.
Router(config-if)# aps force circuit-number
(unchannelized line cards)
or
Router(config-controller)# aps force
circuit-number (channelized line cards)
Manually switches the specified circuit to a protect interface,
unless a request of equal or higher priority is in effect.
circuit-number is the number of the circuit to switch to the protect
interface.
Note This command has no effect if the protection channel is
already the active channel.
Router(config-if)# aps manual circuit-number
(unchannelized line cards)
or
Router(config-controller)# aps manual
circuit-number (channelized line cards)
Manually switches a circuit to a protect interface.
Router# aps lockout [POS | SONET]
slot#/subslot#/port#
Prevents a channel from automatically switching to the active,
working, or protection state.