Nokia recommends grouping working lines and protect lines on separate IOMs.
APS configuration rules:
A working port must be added first. Then a protection port can be added or removed at any time.
A protection port must be shutdown before being removed from an APS group.
A path cannot be configured on a port before the port is added to an APS group.
A working port cannot be removed from an APS group until the APS port path is removed.
When ports are added to an APS group, all path-level configurations are available only on the APS port level and configuration on the physical member ports are blocked.
For a multi-chassis APS group, only one member circuit (either working or protect) can be added. Note that the neighbor IP address of an APS group must be configured before adding a member circuit in it. The configuration of a non-zero neighbor IP address indicates the APS group as multi-chassis. Thus, the member circuit and services must be removed before adding or removing the neighbor IP address (for example, before converting an APS group from multi-chassis to single-chassis or single-chassis to multi-chassis).
Bundle Protection Group (BPGrp) — A BPGrp is a collection of two bundles created on the APS Group port. Working bundle resides on the working circuit of the APS group, while protection bundle resides on the protection circuit of the APS group. APS protocol running on the circuits of the APS Group port monitors the health of the Sonet/SDH line and based on it or administrative action moves user traffic from one bundle to another in the group as part of an APS switch.
The following shows an example configuration for an ATM SC-APS group that contains an aPipe SAP:
A:ALA-274>config# port (1/1/1)
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sonet-sdh
speed oc3
exit
no-shutdown
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A:ALA-274>config>port# aps-1
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aps
working-circuit 1/1/1
protect-circuit 1/1/2
exit
sonet-sdh
path
atm
exit
no-shutdown
exit
exit
no-shutdown
exit
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A:ALA-274>config>service# apipe 100
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sap aps-1:0/100 create
exit
spoke-sdp 1:100 create
exit
no-shutdown
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The following shows an example of the configuration for the working circuit/node of an MC-APS group:
A:ALA-274>config>port (2/1/1)# info
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description "APS Group"
aps
neighbor 192.0.2.2
working-circuit 2/1/1
exit
no shutdown
----------------------------------------------
A:ALA-274>config>port#
The following shows an example of the configuration for the protect circuit/node of an MC-APS group:
A:ALA-274>config>port (2/2/2)# info
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description "APS Group"
aps
neighbor 192.0.2.1
protect-circuit 2/2/2
exit
no shutdown
----------------------------------------------
A:ALA-274>config>port#