Cisco CRS-1 - Carrier Routing System Router Getting Started Guide

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Cisco CRS-1 Series Carrier Routing System Getting Started Guide
Chapter 7 RP Redundancy and Hardware Administration on Cisco IOS XR Software
RP Redundancy and Failover
Role of the Standby RP
The second RP to boot automatically becomes the “standby RP.” While the primary RP manages the
system and communicates with the user interface, the redundant standby RP maintains a complete
backup of the software and configurations for all cards in the system. If the primary RP fails or goes off
line for any reason, the standby RP immediately takes control of the system.
Summary of Redundancy Commands
RP redundancy is enabled by default in the Cisco IOS XR software, but you can use the commands
described in Table 7-3 to display the redundancy status of the cards, or force a manual failover.
Table 7-3 RP Redundancy Commands
Automatic Failover
Automatic failover from the primary RP to the standby RP occurs only if the primary RP encounters a
serious system error, such as the loss of a mandatory process or a hardware failure. When an automatic
failover occurs, the RPs respond as follows:
• If a standby RP is installed and “ready” for failover, the standby RP becomes the active primary RP.
The original primary RP attempts to reboot.
• If the standby RP is not in “ready” state, then both RPs will reboot. The first RP to boot successfully
assumes the role of primary RP.
RP Redundancy During RP Reset
The reset command causes the primary RP to reload the Cisco IOS XR software. When an RP reset
occurs, the RPs respond as follows:
• If a standby RP is installed and “ready” for failover, the standby RP becomes the active primary RP.
The original primary RP reboots and becomes the standby RP.
• If the standby RP is not in the “ready” state, then both RPs reboot. The first RP to boot successfully
assumes the role of primary RP.
Command Description
show redundancy Displays the redundancy status of the RPs. This command also displays the boot and
switch-over history for the RPs.
redundancy failover Forces a manual failover to the standby RP. This command works only if the standby
RP is installed and in the “ready” state.
show platform Displays the status for all cards in the system, including the redundancy status of the
RP cards.
redundancy {enable | disable} Disables or enables RP redundancy. Redundancy is enabled by default.
Note If you disable redundancy and the primary RP fails, is reset, or goes off line,
system operations are halted until the RP is rebooted.

Cisco CRS-1 - Carrier Routing System Router Specifications

General

Brand	Cisco
Model	CRS-1 - Carrier Routing System Router
Category	Network Router
Language	English