Cisco 7304 Installation Guide - Page 77

High Availability NSE Redundancy, High Availability System Requirements

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5 C H A P T E R High Availability NSE Redundancy Caution Two NSE-100s, two NSE-150s, or two NPE-G100 configurations are supported on the Cisco 7304 router. You cannot use different processors in the same Cisco 7304 router at the same time. This chapter contains the following sections: • High Availability System Requirements, page 5-1 • High Availability Commands, page 5-2 • FPGA Upgrades and Failover, page 5-3 • GBIC Module, SFP Module, and FE Management Port Addressing, page 5-3 • CompactFlash Disk Commands, page 5-3 Route processing redundancy is a feature currently available on the Cisco 7304 router. With two NSEs installed in a router, the feature provides the most basic level of increased system availability through a "partial bootup" feature on the standby NSE. A "partial bootup" means that when the active NSE fails or a fatal error is detected on the NSE, the standby NSE will complete booting and take control of the line cards. This minimizes the time that the router is in a failed state, thereby increasing system availability. Switchover takes approximately one minute. Configuration syncing of startup configuration (only) and ROMmon environmental variables are supported. Note During a failover, the entire system will lose all functionality for the duration of the restoration; line cards will be reset, and all traffic flowing through the router at the time of failure will be lost. After a failover, you should replace the failed NSE to maintain high availability. High Availability System Requirements To configure high availability (HA) operation with the Cisco 7304, you need two network services engines that are the same model, and the same Cisco IOS release running on both network services engines. OL-3967-01 Cisco 7304 Network Service Engine Installation and Configuration 5-1

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CHAPTER
5-1
Cisco 7304 Network Service Engine Installation and Configuration
OL-3967-01
5
High Availability NSE Redundancy
Caution
Two NSE-100s, two NSE-150s, or two NPE-G100 configurations are supported on the Cisco 7304
router. You cannot use different processors in the same Cisco 7304 router at the same time.
This chapter contains the following sections:
•
High Availability System Requirements, page 5-1
•
High Availability Commands, page 5-2
•
FPGA Upgrades and Failover, page 5-3
•
GBIC Module, SFP Module, and FE Management Port Addressing, page 5-3
•
CompactFlash Disk Commands, page 5-3
Route processing redundancy is a feature currently available on the Cisco 7304 router. With two NSEs
installed in a router, the feature provides the most basic level of increased system availability through a
“partial bootup” feature on the standby NSE. A “partial bootup” means that when the active NSE fails
or a fatal error is detected on the NSE, the standby NSE will complete booting and take control of the
line cards. This minimizes the time that the router is in a failed state, thereby increasing system
availability. Switchover takes approximately one minute.
Configuration syncing of startup configuration (only) and ROMmon environmental variables are
supported.
Note
During a failover, the entire system will lose all functionality for the duration of the restoration; line
cards will be reset, and all traffic flowing through the router at the time of failure will be lost.
After a failover, you should replace the failed NSE to maintain high availability.
High Availability System Requirements
To configure high availability (HA) operation with the Cisco 7304, you need two network services
engines that are the same model, and the same Cisco IOS release running on both network services
engines.