H3C S5500-EI series Instrucciones de instalación

Command Manual – NTP

H3C S5500-EI Series Ethernet Switches Table of Contents

Table of Contents

Chapter 1 NTP Configuration Commands ..................................................................................1-1

1.1 NTP Configuration Commands.......................................................................................... 1-1

1.1.1 display ntp-service sessions ................................................................................... 1-1

1.1.2 display ntp-service status........................................................................................ 1-3

1.1.3 display ntp-service trace ......................................................................................... 1-4

1.1.4 ntp-service access .................................................................................................. 1-5

1.1.5 ntp-service authentication enable ........................................................................... 1-6

1.1.6 ntp-service authentication-keyid.............................................................................. 1-7

1.1.7 ntp-service broadcast-client .................................................................................... 1-8

1.1.8 ntp-service broadcast-server................................................................................... 1-9

1.1.9 ntp-service in-interface disable ............................................................................... 1-9

1.1.10 ntp-service max-dynamic-sessions ..................................................................... 1-10

1.1.11 ntp-service multicast-client.................................................................................. 1-11

1.1.12 ntp-service multicast-server ................................................................................ 1-11

1.1.13 ntp-service reliable authentication-keyid............................................................. 1-12

1.1.14 ntp-service source-interface................................................................................ 1-13

1.1.15 ntp-service unicast-peer...................................................................................... 1-14

1.1.16 ntp-service unicast-server ................................................................................... 1-15

Command Manual – NTP

H3C S5500-EI Series Ethernet Switches Chapter 1 NTP Configuration Commands

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Chapter 1 NTP Configuration Commands

Note:

The local clock of an S5500-EI Ethernet switch cannot be set as a reference clock. It

can serve as a reference clock source to synchronize the clock of other devices only

after it is synchronized.

1.1 NTP Configuration Commands

1.1.1 display ntp-service sessions

Syntax

display ntp-service sessions [ verbose ]

View

Any view

Parameters

verbose: Displays the detailed information of all NTP sessions.

Description

Use the display ntp-service sessions command to view the information of all NTP

sessions. Without the verbose keyword, this command will display only the brief

information of all NTP service sessions.

Examples

# View the brief information of NTP service sessions.

<Sysname> display ntp-service sessions

source reference stra reach poll now offset delay disper

**************************************************************************

[12345]192.168.0.28 127.127.1.0 2 1 64 1 31.1 9.0 0.0

note: 1 source(master),2 source(peer),3 selected,4 candidate,5 configured

Total associations : 1

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Table 1-1 Description on the fields of the display ntp-service sessions command

Field Description

source IP address of the clock source

reference

Reference clock ID of the clock source

1) If the reference clock is the local clock, the value of this field is

related to the value of the stra field:

zWhen the value of the stra field is 0 or 1, this field will be

“LOCL”;

zWhen the stra field has another value, this filed will be the IP

address of the local clock

2) If the reference clock is the clock of another device on the

network, the value of this field will be the IP address of that

device.

stra Stratum level of the clock source

reach Reachability count of the clock source. 0 indicates that the clock

source in unreachable

poll Poll interval, namely the maximum interval between successive

NTP messages.

now

The length of time in minutes from when the last NTP message was

received or when the local clock was last updated to the current time

The time is in second by default. If the time length is greater than

2048 seconds, it is displayed in minute; if greater than 300 minutes,

in hour; if greater than 96 hours, in day.

offset The offset of the system clock relative to the reference clock, in

milliseconds

delay the roundtrip delay from the local device to the clock source, in

milliseconds

disper The maximum error of the system clock relative to the reference

source.

[12345]

1: Clock source selected by the system, namely the current

reference source, with a system clock stratum level of ≤15

2: Stratum level of this system source is ≤15

3: This clock source has passed the clock selection process

4: This clock source is a candidate clock source

5: This clock source was created by a configuration command

Total

associations Total number of associations

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Note:

When a device is working in the NTP broadcast/multicast server mode, the display

ntp-service sessions command executed on the device will not display the NTP

session information corresponding to the broadcast/multicast server, but the sessions

will be counted in the total number of associations.

1.1.2 display ntp-service status

Syntax

display ntp-service status

View

Any view

Parameters

None

Description

Use the display ntp-service status command to view the NTP service status

information.

Examples

# View the NTP service status information.

<Sysname> display ntp-service status

Clock status: unsynchronized

Clock stratum: 16

Reference clock ID: none

Nominal frequency: 100.0000 Hz

Actual frequency: 100.0000 Hz

Clock precision: 2^18

Clock offset: 0.0000 ms

Root delay: 0.00 ms

Root dispersion: 0.00 ms

Peer dispersion: 0.00 ms

Reference time: 00:00:00.000 UTC Jan 1 1900(00000000.00000000)

Command Manual – NTP

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Table 1-2 Description on the fields of the display ntp-service status command

Field Description

Clock status Status of the system clock

Clock stratum Stratum level of the local clock

Reference clock

After the system clock is synchronized to a remote time server

or a local reference source, this field indicates the address of

the remote time server or the identifier of the local clock source:

zWhen the local clock has a stratum level of 1, the value of

this field is “LOCL”;

zWhen the local clock has another value, the value of this

filed is the IP address of the local clock).

Nominal

frequency The nominal frequency of the local system hardware clock

Actual frequency The actual frequency of the local system hardware clock

Clock precision The precision of the system clock

Clock offset The offset of the system clock relative to the reference source

Root delay The roundtrip delay from the local device to the primary

reference source

Root dispersion The maximum error of the system clock relative to the primary

reference source

Peer dispersion The maximum error of the system clock relative to the reference

source

Reference time Reference timestamp

1.1.3 display ntp-service trace

Syntax

display ntp-service trace

View

Any view

Parameters

None

Description

Use the display ntp-service trace command view the brief information of each NTP

server along the NTP server chain from the local device back to the primary reference

source.

Command Manual – NTP

H3C S5500-EI Series Ethernet Switches Chapter 1 NTP Configuration Commands

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The display ntp-service trace command is available only if the local device can ping

through all the devices on the NTP server chain; otherwise, this command will fail to

display all the NTP servers on the NTP chain due to timeout.

Examples

# View the brief information of each NTP server from the local device back to the

primary reference source.

<Sysname> display ntp-service trace

server 127.0.0.1,stratum 2, offset -0.013500, synch distance 0.03154

server 133.1.1.1,stratum 1, offset -0.506500, synch distance 0.03429

refid LOCL

The information above shows an NTP server chain for the server 127.0.0.1: The server

127.0.0.1 is synchronized to the server 133.1.1.1, and the server 133.1.1.1 is

synchronized to the local clock source.

Table 1-3 Description on the fields of the display ntp-service trace command

Field Description

server IP address of the NTP server

stratum The stratum level of the corresponding system clock

offset The clock offset relative to the upper-level clock

synch distance The synchronization distance relative to the upper-level clock

refid

Identifier of the primary reference source. When the stratum level

of the primary reference clock is 0, it is displayed as LOCL;

otherwise, it is displayed as the IP address of the primary

reference clock.

1.1.4 ntp-service access

Syntax

ntp-service access { peer | query |server |synchronization } acl-number

undo ntp-service access { peer | query |server |synchronization }

View

System view

Parameters

peer: Specifies to permit full access.

query: Specifies to permit control query.

server: Specifies to permit server access and query.

Command Manual – NTP

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synchronization: Specifies to permit server access only.

acl-number: Basic ACL number, in the range of 2000 to 2999

Description

Use the ntp-service access command to configure the NTP service access-control

right to the local device.

Use the undo ntp-service access command to remove the configured NTP service

access-control right to the local device.

By default, the local NTP service access-control right is set to peer.

From the highest NTP service access-control right to the lowest one are peer, server,

synchronization, and query. When a device receives an NTP request, it will perform

an access-control right match and will use the first matched right.

Note:

zThe ntp-service access command provides only a minimum degree of security

protection. A more secure method is identity authentication.

zBefore specifying an ACL number in the ntp-service access command, make sure

you have already created and configured this ACL.

Examples

# Configure devices on the subnet 10.10.0.0/16 to have the full access right to the local

device.

<Sysname> system-view

[Sysname] acl number 2001

[Sysname-acl-basic-2001] rule permit source 10.10.0.0 0.0.255.255

[Sysname-acl-basic-2001] quit

[Sysname] ntp-service access peer 2001

1.1.5 ntp-service authentication enable

Syntax

ntp-service authentication enable

undo ntp-service authentication enable

View

System view

Command Manual – NTP

H3C S5500-EI Series Ethernet Switches Chapter 1 NTP Configuration Commands

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Parameters

None

Description

Use the ntp-service authentication enable command to enable NTP authentication.

Use the undo ntp-service authentication enable command to disable NTP

authentication.

By default, NTP authentication is disabled.

Examples

# Enable NTP authentication.

<Sysname> system-view

[Sysname] ntp-service authentication enable

1.1.6 ntp-service authentication-keyid

Syntax

ntp-service authentication-keyid keyid authentication-mode md5 value

undo ntp-service authentication-keyid keyid

View

System view

Parameters

keyid: Authentication key ID, in the range of 1 to 4294967295.

authentication-mode md5 value: Specifies to use the MD5 algorithm for key

authentication, where value represents authentication key and is a string of 1 to 32

characters.

Description

Use the ntp-service authentication-keyid command to set the NTP authentication

key.

Use the undo ntp-service authentication-keyid command to remove the set NTP

authentication key.

By default, no NTP authentication key is set.

Command Manual – NTP

H3C S5500-EI Series Ethernet Switches Chapter 1 NTP Configuration Commands

1-8

Caution:

zPresently the system supports only the MD5 algorithm for key authentication.

zYou can set a maximum of 1,024 keys for each device.

zIf an NTP authentication key is specified as a trusted key, the key automatically

changes to not trusted after you delete the key. In this case, you do not need to

execute the undo ntp-service reliable authentication-keyid command.

Examples

# Set an MD5 authentication key, with the key ID of 10 and key value of BetterKey.

<Sysname> system-view

[Sysname] ntp-service authentication-keyid 10 authentication-mode md5

BetterKey

1.1.7 ntp-service broadcast-client

Syntax

ntp-service broadcast-client

undo ntp-service broadcast-client

View

VLAN interface view

Parameters

None

Description

Use the ntp-service broadcast-client command to configure the device to work in the

NTP broadcast client mode.

Use the undo ntp-service broadcast-client command to remove the device as an

NTP broadcast client.

Examples

# Configure the device to work in the broadcast client mode and receive NTP broadcast

messages on VLAN-interface 1.

<Sysname> system-view

[Sysname] interface vlan-interface 1

[Sysname-Vlan-interface1] ntp-service broadcast-client

Command Manual – NTP

H3C S5500-EI Series Ethernet Switches Chapter 1 NTP Configuration Commands

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1.1.8 ntp-service broadcast-server

Syntax

ntp-service broadcast-server [ authentication-keyid keyid | version number ] *

undo ntp-service broadcast-server

View

VLAN interface view

Parameters

authentication-keyid keyid: Specifies the key ID to be used for sending broadcast

messages to broadcast clients, where keyid is in the range of 1 to 4294967295. This

parameter is not meaningful if authentication is not required.

version number: Specifies the NTP version, where number is in the range of 1 to 3 and

defaults to 3.

Description

Use the ntp-service broadcast-server command to configure the device to work in

the NTP broadcast server mode.

Use the undo ntp-service broadcast-server command to remove the device as an

NTP broadcast server.

Examples

# Configure the device to work in the broadcast server mode and send NTP broadcast

messages on VLAN-interface 1, using key 4 for encryption, and set the NTP version to

<Sysname> system-view

[Sysname] interface vlan-interface 1

[Sysname-Vlan-interface1] ntp-service broadcast-server authentication-keyid

4 version 3

1.1.9 ntp-service in-interface disable

Syntax

ntp-service in-interface disable

undo ntp-service in-interface disable

View

VLAN interface view

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