思科核心交换主备引擎切换与测试

某省级大型国企业，某项目涉及到引擎切换测试。做了些记录还有心得与大家共享。注:现场实际环境

1，设备硬件

Cisco WS-C6509-E
Component	name	Description
板卡1	WS-X6724-SFP	24 port 1000mb SFP
板卡2	WS-X6748-GE-TX	48 port 10/100/1000mb Ethernet
板卡1	WS-X4648-GE-TX	48 port 10/100/1000mb Ethernet
引擎1	WS-SUP720-3B	Supervisor Engine 720 Rev. 5.6
引擎2	WS-SUP720-3B	Supervisor Engine 720 Rev. 5.6
电源	WS-CAC-3000AC*2	Power Supply ( AC 3000W )
IOS版本       风扇	cat4500e-entservices-mz.122-54.SG1.bin   WS-C6509-E-FAN	Version 12.2(54)SG1       Enhanced 9-slot Fan Tray 1

2，主备引擎模式

    主备引擎前提条件:相同的引擎与相同版本的IOS。

    引擎冗余有两种模式，大家所知的RPR与SSO。SSO与NSF结合是最佳选项。

SSO的优点:含有的特性可以在主备引擎切换时，保持现有会话不会被中断，板卡包转发不中断，

提升网络稳定性能。SSO模式比RPR切换要快，减少路由收敛时间。NSF官方所说最主要优势特性:

减少引擎切换过程中的Routing flap，理能加强其网络稳定性。

3，配置

     (1) en / conf t / redundancy /  mode sso  （ 对NSF了解不是很多，无相关经验，

此处没有用NSF特性。NSF配置：router ospf 100 / nsf  //ospf eigrp bgp 下开启NSF ）

以下是更改为SSO模式的提示:

*Nov 14 04:20:20.451: %C4K_IOSMODPORTMAN-6-MODULEONLINE: Module 4 (WS-X45-SUP6L-E S/N: JAE171404TZ Hw: 3.0) is online

*Nov 14 04:20:20.451: %C4K_REDUNDANCY-6-MODE: ACTIVE supervisor initializing for sso mode

 *Nov 14 04:20:21.383: %C4K_REDUNDANCY-3-COMMUNICATION: Communication with the peer Supervisor has been established

*Nov 14 04:20:27.355: %C4K_REDUNDANCY-5-CONFIGSYNC: The bootvar has been successfully synchronized to the standby supervisor

*Nov 14 04:20:27.355: %C4K_REDUNDANCY-5-CONFIGSYNC: The config-reg has been successfully synchronized to the standby supervisor

*Nov 14 04:20:27.355: %C4K_REDUNDANCY-5-CONFIGSYNC: The startup-config has been successfully synchronized to the standby supervisor

*Nov 14 04:20:27.763: %C4K_REDUNDANCY-5-CONFIGSYNC: The private-config has been successfully synchronized to the standby supervisor

 *Nov 14 04:20:28.703: %C4K_REDUNDANCY-5-CONFIGSYNC_RATELIMIT: The vlan database has been successfully synchronized to the standby supervisor

           (2) show  [module  |  redundancy]       //查看状态

Mod  Redundancy role     Operating mode      Redundancy status

----+-------------------+-------------------+----------------------------------

 3   Active Supervisor   SSO                 Active                           

 4   Standby Supervisor  SSO                 Standby hot                 //成功变为SSO模式

      （3）en / conf t /  redundancy switchover   //切换 ，以下是提示

R6509#redundancy force-switchover

System configuration has been modified. Save ? [yes/no]: y

Building configuration...

1d18h: %PFINIT-SP-5-CONFIG_SYNC: Sync'ing the startup configuration to the standby Router. [OK]This will reload the active unit and force switchover to standby[confirm]

Preparing for switchover..

1d18h: %SYS-SP-3-LOGGER_FLUSHING: System pausing to ensure console debugging output.

1d18h: %RF-SP-5-RF_RELOAD: Self reload. Reason: Admin CLI

1d18h: %OIR-SP-6-CONSOLE: Changing console ownership to switch processor

1d18h: %SYS-SP-3-LOGGER_FLUSHED: System was paused for 00:00:00 to ensure console debugging output.

1d18h: %SYS-SP-3-LOGGER_FLUSHING: System pausing to ensure console debugging output.

1d18h: %SYS-SP-5-RELOAD: Reload requested by Delayed Reload. Reload Reason: reload.

1d18h: %OIR-SP-6-CONSOLE: Changing console ownership to switch processor

System Bootstrap, Version 8.5(2)

Copyright (c) 1994-2007 by cisco Systems, Inc.

Cat6k-Sup720/SP processor with 524288 Kbytes of main memory

Autoboot: failed, BOOT string is empty

Autoboot executing command: "boot "

Initializing ATA monitor library...

string is bootdisk:s72033-advipservicesk9_wan-mz.122-33.SXI1.bin

Loading image, please wait ...

Initializing ATA monitor library...