Allied-Telesis AT-iMG624A Router Manual PDF (Setup & Configuration Guide)

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SNTP command reference

SNTP

5-101

iMG/RG Software Reference Manual (System Administration)

Anycast mode

•

Enable

the SNTP client sends time synchronized broadcast packets to the network and sub-

sequently expects a reply from a valid timeserver. The client then uses the first reply

it receives to establish a link for future sync operations in unicast mode. This server

will then be added to the server association list. The client ignores any later replies

from servers after the first one is received.

The enabled anycast mode takes precedence over any entries currently in the associ-

ations list when the

SNTPCLIENT SYNC

command is issued. The entry will then be

substituted for any existing entry in the unicast association list.

•

Disable

stops synchronization via anycast mode.

Options

The following table gives the range of values for each option that can be specified with

this command and a default value (if applicable).

Example

--> sntpclient set mode anycast enable

See also

SNTPCLIENT ADD SERVER

SNTP SHOW STATUS

5.3.3.1.8 SNTPCLIENT SET POLLINTV

Syntax

SNTPCLIENT SET POLLINTV <pollintv>

Description

This command sets the SNTP client to automatically send a time synchronization request

(specific to the mode) to the network at a specific interval. If the poll-interval is set to 0,

the polling mechanism will be disabled.

Option

Description

Default Value

unicast

Sets the time synchronous access mode to use the unicast

server.

N/A

broadcast

Sets the time synchronous access mode to use the broadcast

server.

N/A

anycast

Sets the time synchronous access mode to use the anycast

server.

N/A

enable

Enables the selected time synchronous access mode.

N/A

disable

Enables the selected time synchronous access mode.

N/A

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SNTP

SNTP command reference

iMG/RG Software Reference Manual (System Administration)

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Options

The following table gives the range of values for each option that can be specified with

this command and a default value (if applicable).

Example

--> sntpclient set pollintv 10

5.3.3.1.9 SNTPCLIENT SYNC

Syntax

SNTPCLIENT SYNC

Description

This command forces the SNTP client to immediately synchronize the local time with the

server located in the association list (if unicast) or, if anycast is enabled, initiate an anycast

sequence to the network.

Example

--> sntpclient sync

See also

SNTPCLIENT ADD SERVER

5.3.3.1.10 SNTPCLIENT SET TIMEOUT

Syntax

SNTPCLIENT SET TIMEOUT <timeout>

Description

This command sets the received packet response timeout value (in seconds) upon sync

request initiation. After timeout, if the

SNTPCLIENT RETRY

command value is set, an

attempt will be retried.

Options

The following table gives the range of values for each option that can be specified with

this command and a default value (if applicable).

Example

--> sntpclient set timeout 10

See also

SNTPCLIENT SET RETRIES

Option

Description

Default Value

pollintv

Sets the polling interval (in minutes) that SNTP client will

sync with a designated server. This can be any value between

0 and 30.

0 (disabled)

Option

Description

Default Value

timeout

Sets the received packet response timeout value (in sec-

onds). This can be any value between 0 and 30.

5 seconds

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SNTP command reference

SNTP

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iMG/RG Software Reference Manual (System Administration)

5.3.3.1.11 SNTPCLIENT SET RETRIES

Syntax

SNTPCLIENT SET RETRIES <retries>

Description

This command sets the number of packet retry attempts when no response is received

from a timeserver. The SNTP client will send another packet for synchronization after a

timeout.

Options

The following table gives the range of values for each option that can be specified with

this command and a default value (if applicable).

Example

--> sntpclient set retries 4

See also

SNTPCLIENT SET TIMEOUT

5.3.3.1.12 SNTP SHOW STATUS

Syntax

SNTPCLIENT SHOW STATUS

Description

This command displays the SNTP client status information.

Example

--> sntpclient show status

- SNTP CLIENT STATUS -

----------------------

Clock Synchronized:

TRUE

SNTP Standard Version Number: 4

SNTP Mode(s) Configured:

Unicast

Local Time:

Mon, 14 Sep 2009 - 05:36:26

Local Timezone:

EST, US Eastern Standard Time

Time Difference +- UTC:

-4:00

Server Stratum:

3

Precision:

1/1048576 of a second

Root Delay:

+0.618 second(s)

Dispersion:

0.5578 second(s)

Server Reference ID:

10.17.90.68

Round Trip Delay:

0 second(s)

Local Clock Offset:

-17999 second(s)

Resync Poll Interval:

20 minute(s)

Packet Retry Timeout:

5 second(s)

Option

Description

Default Value

retries

Sets the number (between 0-10) of packet retry attempts

made when no response is received from a timeserver.

2

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SNTP

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Packet Retry Attempts:

2

Daylight Saving :

Enabled

Daylight Saving Done :

True

sntpclient list servers

See also

SNTPCLIENT LIST SERVERS

5.3.3.1.13 SNTPCLIENT SET CLOCK

Syntax

SNTPCLIENT SET CLOCK <sntpclock>

Description

This command sets the system clock to a specific time and date. This command can be

used as an alternative to synchronizing the local system clock via internal or external

timeservers.

Options

The following table gives the range of values for each option that can be specified with

this command and a default value (if applicable).

Example

The following command sets the

system clock to 11:10:13pm, 29th December 2003:

--> sntpclient set clock 2003:12:29:23:10:13

Option

Description

Default Value

sntpclock

Sets the time and date of the

system clock in

the following format: yyyy:mm:dd:hh:mm:ss

N/A

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MGCP Functional Description

VoIP MGCP

6-1

iMG/RG Software Reference Manual (Voice Service)

6. Voice Service

6.1

VoIP MGCP

The MGCP (Media Gateway Control Protocol) is a protocol that assumes a call control architecture where the

call control ‘intelligence’ is outside the gateways and is handled by external call control elements, the call agent.

MGCP assumes that the gateways have limited storage and functionality.

So, there are two MGCP entities: Call Agent (Media Gateway Controller, MGC) which handles the call control

‘intelligence’, that means the call signaling and the call processing functions and the Media Gateway (MG) that

provides conversion between the audio signals carried on telephone circuits and data packets carried over

Internet or packets networks and expects to execute command sent by the Call Agent.

iMG/RG/iBG devices implement the Media gateway side.

MGCP is a master/slave protocol, while the call agent is mandatory and manages the calls and conferences and

supports the services provided, the endpoint is unaware of the calls and conferences and does not maintain call

states, it is simply expected to execute commands sent by the call agent.

6.1.1

MGCP Functional Description

6.1.1.1 Endpoints

iMG/RG/iBG devices support the configuration of each FXS (Foreign Exchange Station) voice port as a separate

MGCP analogue endpoint allowing a different level of services (number of phone lines) to be delivered.

Each voice port is identified univocal through an endpoint identifier that, by default, takes the following syntax:

Syntax

aaln/<slot>@[$IP]

where:

AALN -Analog Access Line eNdpoint. This name indicates that the endpoint is analog type (only FXS voice

interfaces are supported).

<slot> - indicates the index of the voice port. Physical voice ports start with index 0, the second physical voice

port uses index 1 and so on.

$IP - it’s the ip address of the ip interface where the MGCP protocol is enabled. It is typically used in a multi

host configuration where more than one IP interface is configured in the system or when the ip interface is

dynamic and therefore the value is dynamically assigned by the network.

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