前段时间处理了一个7609的CASE，故障主要是当76重启后，FlexWAN的配置没有正确加载。从现象看是由于配置在FlexWAN完全启动前加载，导致启动后，配置已经加载完毕。暂时可以用“copy start run”做临时解决方案。想要根本解决故障需要升级引擎Rommon的版本。
Rommon可以看作是底层的管理工具，可以升级IOS，更改boot参数等。在一些故障中，如启动后配置丢失，也是可以通过升级rommon来解决的，更具体的信息可以通过下面链接的文档得出。

以下是升级Rommon的完整步骤：

1. check the rp rommon version in active and standby engine:
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Router#sh ver | i ROM:
ROM: System Bootstrap, Version 12.2(17r)SX7, RELEASE SOFTWARE (fc1)

Router#remot command standby-rp show ver | i ROM:

2. upload the rommon software to sup-bootdisk:
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Router#sh sup-bootdisk:
-#- --length-- -----date/time------ path
1      669827 Jun 7 2010 14:49:08 +00:00 c6msfc3-rm2.srec.122-17r.S4

3. check rp rommon status:
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Router#sh rom-monitor slot 6 rp
Region F1: APPROVED, preferred
!---可以把preferred看成优先级，优选存在F1区域中的Rommon
Region F2: APPROVED
Currently running ROMMON from F1 region
!---有些时候Rommon不存在F1和F2中，而存在Gold中

4. upgrade the rp rommon:
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Router#upgrade rom-monitor slot 6 rp file sup-bootdisk:c6msfc3-rm2.srec.122-17r.S4
Router#
*Jun  7 14:54:26.379: ROMMON image upgrade in progress
*Jun  7 14:54:26.399: Erasing flash
*Jun  7 14:54:29.455: Programming flash
*Jun  7 14:54:31.399: Verifying new image
*Jun  7 14:54:31.579: ROMMON image upgrade complete
 The card must be reset for this to take effect

5. check the rp rommon status again:
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Router#sh rom-monitor slot 6 rp
Region F1: APPROVED
Region F2: FIRST_RUN, preferred
!---下次重启，优选F2的Rommon
Currently running ROMMON from F1 region
!---重启前不会发生变化

6. wr and reload engine

7. check the upgraded rommon version.
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Router#sh rom-monitor slo 6 rp
Region F1: APPROVED
Region F2: APPROVED, preferred
Currently running ROMMON from F2 region
Router#
Router#
Router#sh ver | i ROM:
ROM: System Bootstrap, Version 12.2(17r)S4, RELEASE SOFTWARE (fc1)

8. reload again and login into rp rommon(not sp rommon)
!—第8，9步是解决FlexWan的问题，如果只是升级Rommon，请不要操作这2步
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00:00:06: %OIR-6-CONSOLE: Changing console ownership to route processor

System Bootstrap, Version 12.2(17r)S4, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 2005 by cisco Systems, Inc.
Cat6k-Sup720/RP platform with 524288 Kbytes of main memory

rommon 1 >

9. config follow command, please don’t change any command.
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rommon 1 > priv
You now have access to the full set of monitor commands.
Warning: some commands will allow you to destroy your
configuration and/or system images and could render
the machine unbootable.
rommon 2 >
rommon 2 > nvram_erase
Enter in hex the start address [0x0]:  0xbe020000
Enter in hex the test size or length in bytes [0x0]:  10000
!---不要更改任何参数
rommon 3 >
rommon 4 > reset