The standby Cat65 was failed, I convert it to standby then back to VSS.
The standby Cat65 got the following messages then to rommon>
"cisco IOS Software, s72033_sp Software (s72033_sp-ADVENTERPRISEK9-M), Version 12 .2(33)SXI5, RELEASE SOFTWARE (fc2) Technical Support: http://www.cisco.com/techsupport Copyright (c) 1986-2010 by Cisco Systems, Inc. Compiled Sat 23-Oct-10 02:08 by prod_rel_team Image text-base: 0x40101328, data-base: 0x4231C7C0
System detected Virtual Switch configuration... Interface TenGigabitEthernet 2/5/4 is member of PortChannel 20 Interface TenGigabitEthernet 2/5/5 is member of PortChannel 20 Active crashed three times, disabling auto-boot and dropping to rommon"
This is the messages on standby Cat65:
*Jul 20 23:42:28.571: %SYS-SW2_SPSTBY-5-RELOAD: Reload requested - From Active S witch (Reload peer unit). *Jul 20 23:42:30.083: %VSLP-SW2_SPSTBY-3-VSLP_LMP_FAIL_REASON: 5/4 : Link down *Jul 20 23:42:30.087: %VSLP-SW2_SPSTBY-3-VSLP_LMP_FAIL_REASON: 5/5 : Link down *Jul 20 23:42:30.087: %VSLP-SW2_SPSTBY-2-VSL_DOWN: Last VSL interface 5/5 we nt down
*Jul 20 23:42:30.091: %VSLP-SW2_SPSTBY-2-VSL_DOWN: All VSL links went down whi le switch is in Standby role