Specifying a startup configuration file ·······················································································································109

Backing up the startup configuration file ···················································································································110

Deleting a startup configuration file ···························································································································110

Restoring a startup configuration file ·························································································································110

Displaying and maintaining a configuration file ······································································································111

Software upgrade configuration ···························································································································· 112

Device software overview ···········································································································································112

Software upgrade methods·········································································································································112

Software upgrade through a system reboot··············································································································113

Upgrading Boot ROM through a system reboot ······························································································113

Upgrading system software through a system reboot ·····················································································114

Software upgrade by installing hotfixes ····················································································································115

Basic concepts in hotfix ······································································································································115

Patch state ····························································································································································115

Hotfix configuration task list ·······························································································································118

Configuration prerequisites ································································································································118

Installing a patch in one step ·····························································································································119

Installing a patch step-by-step ····························································································································120

Uninstalling a patch step-by-step ·······················································································································122

Displaying and maintaining software upgrade ········································································································123

Software upgrade configuration examples ···············································································································124

Immediate upgrade configuration example (for standalone mode) ······························································124

Immediate upgrade configuration example (for IRF mode) ············································································125

Hotfix configuration example (for standalone mode)······················································································127

ISSU overview ························································································································································· 129

Performing an ISSU upgrade ······································································································································129

ISSU upgrade in standalone mode ···················································································································129

ISSU upgrade in IRF mode ·································································································································129

ISSU states····························································································································································130

Selecting an ISSU upgrade method ···························································································································130

Compatible···························································································································································131

Incompatible ························································································································································131

Same·····································································································································································131

Unknown ······························································································································································131

ISSU upgrade prerequisites ········································································································································131

ISSU configuration ·················································································································································· 133

ISSU configuration (standalone mode) ······················································································································133

ISSU upgrade (compatible) ································································································································133

ISSU upgrade (incompatible) ·····························································································································134

ISSU configuration (IRF mode) ····································································································································134

MPU-based ISSU upgrade (compatible) ···········································································································135

Member switch-based ISSU upgrade (compatible)··························································································136

Member switch-based ISSU upgrade (incompatible) ······················································································136

Version rollback ···························································································································································137

Displaying and maintaining ISSU ······························································································································139

ISSU configuration example··································································································································· 140

Standalone mode ·························································································································································140

ISSU configuration example (compatible) ········································································································140

ISSU configuration example (incompatible) ·····································································································141

IRF mode ·······································································································································································143

MPU-based ISSU upgrade configuration example (compatible)····································································143

Member switch-based ISSU upgrade configuration example (compatible) ··················································145

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