Ericsson EDN312 Betriebsanweisung PDF herunterladen (Seite 28)

Function Description

4/1553-HSC 901 101/2 Uen B 2009-02-27

3.2.3.7 Start without a Domain File Server

Upon reboot the IP DSLAM sends a DHCP request. It receives data (IP

address of Domain File Server, name and path to Application SW and

configuration file, IP address of IP DSLAM) from the DHCP Server.

The IP DSLAM will compare the Application SW file name with the name of

the file stored in Flash. If they are identical, the Application SW will be run

from Flash. If the Application SW file names are different, the IP DSLAM

will try to download the SW from the Domain File Server.

The IP DSLAM will try to download the SW for a specific amount of time

and uses an adaptive TFTP timeout. It measures the roundtrip delay (the

time that it takes a packet to reach the destination and back) and sets the

TFTP timeout as 10*roundtrip delay, but always selects a value between

0.5 to 20 seconds. After three timeouts, the IP DSLAM loads and runs the

Application SW from Flash.

From that point on it will try to reach the Domain File Server every minute.

An alarm will be sent only once and when the connection to the Domain

File Server has been re-established and the IP DSLAM is able to download

the configuration file a ceasing alarm is sent.

Any end-user configured in the configuration file and saved in the flash

memory will be able to use the ADSL connection. When the Domain File

Server can be reached again, the IP DSLAM will download the

configuration file and compare it with the file saved in the Flash. If they are

identical, the downloaded file will be discarded, and the IP DSLAM will be in

normal operation state. If the configuration file is different, the IP DSLAM

will reboot and go through a normal reboot procedure.

Note:

Subscriber traffic will be interrupted during reboot. Figure 14 on

page 25 illustrates the start scenario when the Domain File Server

cannot be reached by the IP DSLAM.

Note:

Only the configuration file is compared. If the Application SW has

been changed, PEM will always check that the IP DSLAM is

running with the SW specified in PEM.

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Ericsson EDN312 Betriebsanweisung Seite 28