Cisco BPX 8650, Руководство по установке и настройке

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13-10
Cisco BPX 8600 Series Installation and Configuration
Release 9.3.30, Part Number 78-12907-01 Rev. E0, May 2005
Chapter 13 Installing the BPX Switch Cards
Specifying Card Redundancy
Specifying Card Redundancy
You can set up port redundancy by installing two identical front and back card sets, connecting them with
a Y-cable on each paired port, then specifying redundancy with the
addyred command. Redundancy
applies to the entire card and is not port or line-specific.
The following commands apply to Y-cable redundancy:
• addyred
•
delyred
•
dspyred
•
prtyred
• switchyred
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.
BPX card sets may consist of the following:
•
BCC front card
•
BNI front card and T3, E3, or OC-3 back card
•
BXM front card and MMF, SMF, or SMFLR back card
• BME front card and SMF back card
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 a redundant card set pair.
•
If an active card fails, is downed, or removed from the backplane, data automatically goes through
the secondary set.
• Most service cards on the IGX and BPX nodes support Y-cable redundancy, with the exception of
MMF back cards which do not support Y-redundancy
•
Most trunk cards support trunk redundancy. For a description, see Chapter 9, “Installation in
Customer Cabinet.”
Figure 13-7 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 to the standby card occurs only if the secondary card set is in a “Standby” or a “Standby-T”
state (but not “Failed”). For information on the states, refer to the definition for the
dspcds command of
the Cisco WAN Switching Command Reference, Release 9.3.30 .