Cisco Systems 15530 Configuring Unidirectional and Bidirectional Path Switching

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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
Figure 7-9 shows the behavior of bidirectional path switching when a loss of signal occurs. In the two
node example network, bidirectional path switching operates as follows:
•Node 2 sends the signal over both the active and standby paths.
•Node 1 receives both signals and selects the signal on the active path.
•Node 1 detects a loss of signal light on its active path and switches over to the standby path.
•Node 1 sends an APS message to node 2 on the protection path indicating that it has switched.
•Node 2 processes the APS message and switches from the a ct ive path to the stan dby pa th.
Both node 1 and node 2 communicate on the same path.
Figure7-9 Bidirectional Path Switching Overview
Configuring Unidirectional and Bidirectional Path Switching
To configure unidirectional or bidirectional path switching, use the following commands, beginn ing in
global configuration mode:
Node 2 standby path transparent
4/0/0
transparent
4/0/0
Node 1 Node 2
Node 2 active path
wavepatch 4/0/0
wavepatch 4/0/1
wavepatch 4/0/0
wavepatch 4/0/1
wdm 0/0 wdm 0/0
wdm 0/1 wdm 0/1
Node 1 active path
Loss of signal
Switchover Switchover
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Command Purpose
Step1 Switch(config)# redundancy
Switch(config-red)#
Enters redundancy configuration mode.
Step2 Switch(config-red)# associate group name
Switch(config-red-aps)#
Selects the interfaces to associate and enters APS
configuration mode.
Note The group name is case sensitive.
Step3 Switch(config-red-aps)# aps disable Disables APS activity between the interfaces.
Step4 Switch(config-red-aps)# aps direction
{unidirectional | bidirectional}Specifies the type of path switching. The default behavior is unidirectional.
Step5 Switch(config-red-aps)# aps timer message
holddown milliseconds count number Changes the APS Channel Protocol holddown timer and message count values. The default is
5000 m illise conds and a co unt of 2. (Optional)