1、升级前的验证与备份命令
!
show redundancy
show rom-monitor slot 5 sp
show rom-monitor slot 5 rp
show rom-monitor slot 6 sp
show rom-monitor slot 6 rp
show tac
!

2、第一步开始备引擎的Rommon升级
备注：备引擎在第6插槽，先升级备引擎的SP镜像，再升级备引擎的RP镜像。
SP升级命令
upgrade rom-monitor slot 6 sp file tftp://10.126.76.239/rsp720_sp-rm2.srec.122-33r.SRD5
验证命令
show rom-monitor slot 6 SP

RP升级命令
upgrade rom-monitor slot 6 rp file tftp://10.126.76.239/rsp720_rp-rm2.srec.122-33r.SRD5
验证命令
show rom-monitor slot 6 rp

3、重新加载第6插槽的备引擎
备注：在完全升级完Rommon后重新加载，而不是切换。
重新加载命令
hw-module module 6 reset
冗余引擎验证命令
show redundancy
show rom-monitor slot 6 sp
show rom-monitor slot 6 rp

4、第二步开始主引擎的Rommon升级
备注：升级前验证第5插槽的主引擎
show redundancy
show rom-monitor slot 5 sp
show rom-monitor slot 5 rp

5、升级第5插槽的主引擎
备注：首先我们需要切换第5插槽的主引擎，等备引擎变为主引擎，再升级第5插槽的原主引擎现在为备引擎。
冗余引擎切换命令：
redundancy force-switchover

6、升级第5插槽的Rommon.
SP升级命令
upgrade rom-monitor slot 5 sp file tftp://10.126.76.239/rsp720_sp-rm2.srec.122-33r.SRD5
验证命令
show rom-monitor slot 5 sp
RP升级命令
upgrade rom-monitor slot 5 rp file tftp://10.126.76.239/rsp720_rp-rm2.srec.122-33r.SRD5
验证命令
show rom-monitor slot 5 rp

7、重新加载在第5槽的备引擎
备注：在完全升级完Rommon后重新加载，而不是切换。
重新加载命令
hw-module module 5 reset

8、在第5槽的备引擎起来后验证Rommon升级是否成功？
验证命令
show rom-monitor slot 5 sp
show rom-monitor slot 5 rp
show rom-monitor slot 6 sp
show rom-monitor slot 6 rp

Note: Once standby supervisor come up we will switchover module 6 active to standby in order to keep active module 5 and standby module 6 but this is not necessary just for consistency.

9、回滚步骤
a) Connect to the supervisor using console connection.
b) Check if we have some response from console.
c) If yes most likely supervisor is in ROMMON mode .
d) We should try to boot IOS from ROMMON (using “boot [path to IOS]” command).
e) If there will be no response from console try to reboot it one more time by powering it off and on.
f) If after power cycle there will be no response from console it would mean that supervisor has failed and has to be replaced.