iv
Configuration example ················································································································································ 106
Configuring NTP ····················································································································································· 109
Overview ······································································································································································· 109
NTP application ··················································································································································· 109
NTP advantages ·················································································································································· 109
How NTP works ··················································································································································· 110
NTP message format ··········································································································································· 111
NTP operation modes ········································································································································· 112
Configuring NTP in the Web interface ······················································································································ 114
Configuring NTP ·················································································································································· 114
NTP configuration example ································································································································ 116
Configuring NTP at the CLI ········································································································································· 118
NTP configuration task list ·································································································································· 118
Configuring NTP operation modes ···················································································································· 118
Configuring the local clock as a reference source ·························································································· 120
Configuring optional parameters for NTP ········································································································ 121
Configuring access-control rights ······················································································································· 122
Configuring NTP authentication ························································································································ 123
Displaying and maintaining NTP ······················································································································· 127
NTP client/server mode configuration example ······························································································ 128
NTP symmetric peers mode configuration example ························································································ 129
NTP broadcast mode configuration example ··································································································· 130
NTP multicast mode configuration example ····································································································· 132
Configuration example for NTP client/server mode with authentication ······················································ 134
Configuration example for NTP broadcast mode with authentication ·························································· 136
Configuration guidelines ············································································································································· 139
Upgrading software ················································································································································ 140
Hardware compatibility ··············································································································································· 140
Overview ······································································································································································· 140
Software upgrade methods ········································································································································· 141
Upgrading BootWare ·················································································································································· 141
Upgrading the system software ·································································································································· 142
Upgrading system software in the Web interface ··························································································· 142
Upgrading system software at the CLI ·············································································································· 143
Installing hotfixes ·························································································································································· 143
Basic concepts ····················································································································································· 143
Patch states ··························································································································································· 144
Patch installation task list ···································································································································· 147
Installation prerequisites ····································································································································· 147
Installing and running a patch in one step ······································································································· 147
Installing a patch step by step ··························································································································· 148
Uninstalling a patch step by step ······················································································································· 149
Displaying and maintaining software upgrade ········································································································ 150
Software upgrade examples ······································································································································· 150
Upgrading the entire system software from the CLI ························································································· 150
Installing patches from the CLI ··························································································································· 152
Dealing with password loss ···································································································································· 153
Disabling password recovery capability ··················································································································· 154
Examining the state of password recovery capability ····························································································· 154
Dealing with console login password loss when password recovery capability is enabled ······························· 155
Dealing with user privilege level password loss when password recovery capability is enabled ······················ 157
Dealing with password loss when password recovery capability is disabled ······················································ 158
