相关硬件:
WS-SUP720-3A    WS-SUP720-3B    WS-SUP720-3BXL

故障现象:
config-register值为正常的 0×2102, IOS 也没有损坏。
但是7609的SUP720-3B引擎启动后直接停留在rommon状态,不引导IOS。
解决方法:
升级 Supervisor Engine 720 的SP(Switch Processor) 的ROMMON Image(Bootstrap)到 8.4(2)
升级方法:
1. 检查当前 SP 的 Bootstrap (示例中为7609双引擎)
Router-7609#sh rom-monitor slot 5 sp
Region F1: INVALID
Region F2: INVALID
Currently running ROMMON from S (Gold) region
Router-7609#sh rom-monitor slot 6 sp
Region F1: INVALID
Region F2: INVALID
Currently running ROMMON from S (Gold) region
2. 升级 SP 的 Bootstrap
Router-7609#upgrade rom-monitor slot 5 sp file tftp://x.x.x.x/c6ksup3-rm2.srec.8.4.2
Copying tftp://x.x.x.x/c6ksup3-rm2.srec.8.4.2 onto SP’s bootdisk…
Loading c6ksup3-rm2.srec.8.4.2 from 10.178.190.117 (via FastEthernet8/1): !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
[OK - 473563 bytes]
Loading c6ksup3-rm2.srec.8.4.2 from 10.178.190.117 (via FastEthernet8/1): !
Oct 19 19:40:05.789 CCT: SP: ROMMON p_w_picpath upgrade in progress
Oct 19 19:40:05.789 CCT: SP: Erasing flash
Oct 19 19:40:08.572 CCT: SP: Programming flash
Oct 19 19:40:10.863 CCT: SP: Verifying new p_w_picpath
Oct 19 19:40:10.971 CCT: SP: ROMMON p_w_picpath upgrade complete, Supervisor engine must be reloaded.
Router-7609#upgrade rom-monitor slot  sp file tftp://x.x.x.x/c6ksup3-rm2.srec.8.4.2
Copying tftp://x.x.x.x/c6ksup3-rm2.srec.8.4.2 onto SP’s bootdisk…
Loading c6ksup3-rm2.srec.8.4.2 from 10.178.190.117 (via FastEthernet8/1): !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
[OK - 473563 bytes]
Loading c6ksup3-rm2.srec.8.4.2 from 10.178.190.117 (via FastEthernet8/1): !
*Oct 19 19:40:29.494 CCT: SP-STDBY: ROMMON p_w_picpath upgrade in progress
*Oct 19 19:40:29.494 CCT: SP-STDBY: Erasing flash
*Oct 19 19:40:32.082 CCT: SP-STDBY: Programming flash
*Oct 19 19:40:34.006 CCT: SP-STDBY: Verifying new p_w_picpath
*Oct 19 19:40:34.110 CCT: SP-STDBY: ROMMON p_w_picpath upgrade complete, Supervisor engine must be reloaded.
3. 确认 SP 的 Bootstrap 和 register 值
Router-7609#sh rom-monitor slot 5 sp
Region F1: FIRST_RUN, preferred
Region F2: INVALID
Currently running ROMMON from S (Gold) region
Router-7609#sh rom-monitor slot 6 sp
Region F1: FIRST_RUN, preferred
Region F2: INVALID
Currently running ROMMON from S (Gold) region
Router-7609#sh ver
Configuration register is 0×2102
4. 重启
Router-7609#reload
Proceed with reload? [confirm]y
5. 重启后确认
Router-7609#sh rom-monitor slot 5 sp
Region F1: APPROVED, preferred
Region F2: INVALID
Currently running ROMMON from F1 region
Router-7609#sh rom-monitor slot 6 sp
Region F1: APPROVED, preferred
Region F2: INVALID
Currently running ROMMON from F1 region

注意事项:
 
 在用upgrade命令升级Bootstrap后,需要使用reload命令重启。
 不能使用hw-module module x reset命令进行重启或者进行online insertion and removal (OIR)
 操作甚至断电。
 必须要reload后用 show rom-monitor slot x sp 命令确认Bootstrap 状态为APPROVED, preferred