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Using ping, tracert, and system debugging ··············································································································· 1
Ping ····················································································································································································· 1
Using a ping command to test network connectivity ···························································································· 1
Ping example ···························································································································································· 1
Tracert ················································································································································································ 3
Prerequisites ······························································································································································ 4
Using a tracert command to identify failed or all nodes in a path ····································································· 4
Tracert example ························································································································································ 4
System debugging ···························································································································································· 6
Debugging information control switches················································································································ 6
Debugging a feature module ·································································································································· 6
Configuring NTP ·························································································································································· 8
Overview ············································································································································································ 8
How NTP works ························································································································································ 8
NTP architecture ······················································································································································· 9
Association modes ················································································································································ 10
NTP security ··························································································································································· 12
Protocols and standards ······································································································································· 13
Configuration restrictions and guidelines ···················································································································· 13
Configuration task list ···················································································································································· 13
Enabling the NTP service ·············································································································································· 13
Configuring NTP association modes ···························································································································· 14
Configuring NTP in client/server mode ·············································································································· 14
Configuring NTP in symmetric active/passive mode ························································································ 14
Configuring NTP in broadcast mode ·················································································································· 15
Configuring NTP in multicast mode ····················································································································· 16
Configuring access control rights ································································································································· 17
Configuring NTP authentication ··································································································································· 17
Configuring NTP authentication in client/server mode ····················································································· 17
Configuring NTP authentication in symmetric active/passive mode ······························································· 19
Configuring NTP authentication in broadcast mode ························································································· 21
Configuring NTP authentication in multicast mode ··························································································· 23
Configuring NTP optional parameters ························································································································· 26
Specifying the source interface for NTP messages ···························································································· 26
Disabling an interface from processing NTP messages ···················································································· 26
Configuring the maximum number of dynamic associations ············································································ 27
Configuring a DSCP value for NTP packets ······································································································· 27
Configuring the local clock as a reference source ····································································································· 28
Displaying and maintaining NTP ································································································································· 28
NTP client/server mode configuration example ········································································································· 28
IPv6 NTP client/server mode configuration example ································································································· 30
NTP symmetric active/passive mode configuration example ··················································································· 31
IPv6 NTP symmetric active/passive mode configuration example ··········································································· 33
NTP broadcast mode configuration example ············································································································· 35
NTP multicast mode configuration example ················································································································ 36
IPv6 NTP multicast mode configuration example ······································································································· 39
Configuration example for NTP client/server mode with authentication ································································· 42
Configuration example for NTP broadcast mode with authentication ····································································· 44
