System maintenance and debugging ························································································································· 1

Ping·····················································································································································································1

Introduction ·······························································································································································1

Configuring ping ······················································································································································1

Ping configuration example ····································································································································1

Tracert ················································································································································································3

Configuring tracert ···················································································································································4

System debugging ····························································································································································5

Introduction to system debugging···························································································································5

Displaying debugging information·························································································································5

Configuring system debugging·······························································································································6

Ping and tracert configuration example ·························································································································7

NTP configuration ························································································································································ 9

NTP overview ····································································································································································9

Applications of NTP ·················································································································································9

Advantages of NTP ··················································································································································9

How NTP works····················································································································································· 10

NTP message format ············································································································································· 11

Operation modes of NTP ····································································································································· 12

NTP configuration task list············································································································································· 14

Configuring the operation modes of NTP ··················································································································· 15

Operation modes and static and dynamic associations ··················································································· 15

Configuring NTP client/server mode ·················································································································· 15

Configuring the NTP symmetric peers mode ······································································································ 16

Configuring NTP broadcast mode······················································································································· 16

Configuring NTP multicast mode ························································································································· 17

Configuring optional parameters of NTP ···················································································································· 18

Specifying the source interface for NTP messages ···························································································· 18

Disabling an interface from receiving NTP messages······················································································· 18

Configuring the maximum number of dynamic sessions allowed ···································································· 19

Configuring access-control rights ································································································································· 19

Configuration prerequisites ·································································································································· 19

Configuration procedure ······································································································································ 19

Configuring NTP authentication ··································································································································· 20

Displaying and maintaining NTP ································································································································· 22

NTP configuration examples········································································································································· 22

Configuring NTP client/server mode ·················································································································· 22

Configuring the NTP symmetric mode ················································································································ 23

Configuring NTP broadcast mode······················································································································· 25

Configuring NTP multicast mode ························································································································· 27

Configuring NTP client/server mode with authentication················································································· 29

Configuring NTP broadcast mode with authentication ····················································································· 30

Information center configuration ·······························································································································34

Information center overview·········································································································································· 34

Introduction to information center························································································································ 34