Specifications

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Cisco IGX 8400 Series Provisioning Guide, Release 9.3.3 and Later Releases
OL-1166-04
Chapter 3 Cisco IGX 8400 Series Nodes
IGX Node Configuration
During normal operation, the primary set is active and carrying traffic, while the secondary set is in
standby. The primary set configuration is the configuration for both the primary and redundant set. If
you reset the primary cards or the primary card set becomes inactive for another reason, the secondary
card set becomes active.
The following requirements apply to redundant card sets:
• The primary and secondary card sets must be identical.
• Secondary card sets must not be already active.
• Neither the primary nor secondary card set may already be part of another redundant card set pair.
• If an active card fails, is downed, or removed from the backplane, data automatically goes through
the secondary set.
• All service cards on the IGX support Y-cable redundancy.
Figure 3-3 illustrates the typical Y-cable connection of primary and secondary card sets. The single end
of a Y-cable (or base of the Y) goes to the user equipment. One of the two connectors at the split end
goes to the primary back card, and the other connector goes to the secondary back card.
Switching between Y-redundant cards occurs only if the standby card set is in a standby or standby-T
state (but not failed).
Figure 3-3 Y-Cable Configuration
Table 3-2 Specifying Card Redundancy
Command Description
addyred Specifies the slots of the primary and secondary cards
that form the redundant pair.
delyred Disables Y-cable redundancy for the card set in the
specified primary slot number.
dspyred Displays information for Y-cable pairings.
prtyred Prints information for Y-cable pairings.
User
equipment
(data)
Y cable
Active cards
Standby cards
Back
card
Front
card
S5837
Back
card
Front
card