ASR 5000 Installation Guide â–„
Line Card Redundancy
To optimize network efficiency and minimize down time, the system supports 1:1 redundancy for OLC2s, CLC2s,
FLC2s, GLC2s, and QELCs.
With the exception of the XGLC, line cards are installed in the half-height slots at the rear of the chassis. This design
allows two Ethernet or two Optical (ATM) or two Channelized line cards directly behind (one top, one bottom) every
packet processing card that normally operates in active mode.
When two line cards are installed, the card in the upper-rear chassis slot is automatically the active card. The card in the
lower-rear chassis slot is automatically placed in standby mode. In the event that the active card experiences a failure,
the system automatically migrates traffic to the standby card in the lower slot.
Side-by-side Redundancy for the XGLC
The XGLC is a full-height card that requires both top and bottom line card slots for a single 10-Gigabit port. To achieve
one-to-one line card redundancy, you must install two XGLCs in adjacent slots. Otherwise, you configure port and card
redundancy for the XGLCs in the same way as other line cards. There are no restrictions that prevent the side-to-side 1:1
XGLC redundant arrangement from functioning with other Ethernet line card types.
An active packet processing card must always be installed behind an XGLC. Monitoring functions occur in a distributed
fashion. Select the XGLCs that act as a redundant pair via the CLI. Configure the redundant pairs prior to configuring
the interface bindings so that proper parallel physical and logical port configurations are established. The card
redundancy and monitoring begins as soon as the packet processing card in front is active.
Important: The packet processing cards behind a pair of redundant XGLCs must always be in Active mode.
Requirement Summary
There must be a direct connection to a packet processing card behind each side-by-side redundant XGLC pair.
Configure the XGLC Ethernet line cards in a chassis as redundant pairs with cards in the following adjacent slots:
 17 – 18
 19 – 20
 21 – 22
 23 – 26 (SPIOs 24 and 25 are skipped in this line card redundancy model)
 27 – 28
 29 – 30
 31 – 32
Important: Use only the top line card slot numbers to configure XGLC 1:1 redundancy.
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