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

Enabling the SNTP service ······························································································································ 43

Specifying an NTP server for the device ·········································································································· 43

Configuring SNTP authentication ····················································································································· 44