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Cisco 6260 Hardware Installation Guide
OL-2365-02
Chapter 1 Product Overview
Cisco 6260 System Overview
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DS3/2DS3
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DS3+T1/E1 IMA
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OC-3c/OC-3c (SMF and MMF)
During steady-state operations, one NI-2 card functions as the active unit, and the other functions as the
standby unit. The active NI-2 card displays a green ACTIVE LED. In an active state, the NI-2 card
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Has full Ethernet, auxiliary port, and console access
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Communicates with line cards
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Has full access to the environmental monitoring subsystem
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Has access to the optical interfaces on the standby NI-2 card
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Allows remote access to the file system of the standby NI-2 card
The standby NI-2 card plays a minimal role during steady-state operations. In a standby state, the
NI-2 card
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Receives configuration changes from the active NI-2 card (when the cards are configured
for synchronization)
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Has no Ethernet, auxiliary port, or console access
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Does not communicate with line cards
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Has no access to the environmental monitoring subsystem
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Generates only APS alarms, which are reported via the active card
For management purposes, the primary and secondary NI-2 cards appear as one element. The cards share
one IP address.
Note
For information on NI-2 card cold redundancy switchover conditions, refer to the
Upgrading DSLAMs
for NI-2 Card and APS Link Redundancy
document.
1.2.3.13.2 APS Link Redundancy
APS link redundancy provides recovery from a cut fiber or the failure of an OC-3c optical TX or optical
RX interface on an NI-2 card. APS link redundancy is available on OC-3c/OC-3c NI-2 card network
trunk and subtend interfaces.
APS link redundancy is nonrevertive. After a switchover from the primary to the secondary fiber occurs,
the active NI-2 card switches back to the primary fiber only if it is manually forced through a
command-line interface (CLI) or if a failure condition occurs on the secondary fiber. However, if a
failure condition occurs on the secondary fiber while the primary fiber is still in a failed state, a switch
back to the primary fiber does not occur.
Note
The OC-3c ports on the standby NI-2 card are available for APS link redundancy only if the standby NI-2
card is working and in a STANDBY-READY state.
For more information on APS link redundancy, refer to the
Upgrading DSLAMs for NI-2 Card and APS
Link Redundancy
document.