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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 ············································································································································· 5
Debugging information control switches ···································································································· 6
Debugging a feature module ······················································································································ 6
Configuring NTP ····························································································· 7
Overview ···························································································································································· 7
How NTP works ········································································································································· 7
NTP architecture ········································································································································ 8
Association modes ····································································································································· 9
NTP security ············································································································································· 10
Protocols and standards ·························································································································· 11
Configuration restrictions and guidelines ········································································································· 11
Configuration task list ······································································································································· 11
Enabling the NTP service ································································································································ 12
Configuring NTP association mode ················································································································· 12
Configuring NTP in client/server mode ···································································································· 12
Configuring NTP in symmetric active/passive mode ················································································ 13
Configuring NTP in broadcast mode ········································································································ 13
Configuring NTP in multicast mode ·········································································································· 14
Configuring access control rights ····················································································································· 15
Configuring NTP authentication ······················································································································· 15
Configuring NTP authentication in client/server mode ············································································· 15
Configuring NTP authentication in symmetric active/passive mode ························································ 17
Configuring NTP authentication in broadcast mode ················································································· 19
Configuring NTP authentication in multicast mode ·················································································· 21
Configuring NTP optional parameters ·············································································································· 23
Specifying the source interface for NTP messages ················································································· 23
Disabling an interface from receiving NTP messages ············································································· 24
Configuring the maximum number of dynamic associations ···································································· 24
Setting a DSCP value for NTP packets ···································································································· 25
Configuring the local clock as a reference source ··························································································· 25
Displaying and maintaining NTP ······················································································································ 26
NTP configuration examples ···························································································································· 26
NTP client/server mode configuration example ······················································································· 26
IPv6 NTP client/server mode configuration example ··············································································· 27
NTP symmetric active/passive mode configuration example ··································································· 28
IPv6 NTP symmetric active/passive mode configuration example ··························································· 30
NTP broadcast mode configuration example ··························································································· 31
NTP multicast mode configuration example ····························································································· 33
IPv6 NTP multicast mode configuration example ···················································································· 35
Configuration example for NTP client/server mode with authentication ··················································· 38
Configuration example for NTP broadcast mode with authentication ······················································ 40
Configuring SNTP ························································································· 43
Configuration restrictions and guidelines ········································································································· 43
Configuration task list ······································································································································· 43
Enabling the SNTP service ······························································································································ 43
Specifying an NTP server for the device ·········································································································· 43
Configuring SNTP authentication ····················································································································· 44
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