Ericsson EDN312 Guia do Utilizador descarregar pdf (Página 26)

Function Description

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

3.2.3.6 Start without a DHCP Server (Start from Flash)

The following description does not take the unmanaged last mode into

account (for simplicity reasons). The only difference is where the DHCP

procedure is run from. If the last mode was unmanaged, the DHCP

procedure will be run from the application SW. If the last mode was

managed, the DHCP procedure will be run from the boot SW.

There are two scenarios that concern the DHCP server:

1. The DHCP server does not respond at all

2. The DHCP server responds with an illegal response (from a standby

ECN)

Figure 12 on page 22 illustrates the start-up of an IP DSLAM when there is

no DHCP response at all. Note the two timeouts of 2 minutes each: one

waiting for response in the tagged management VLAN, and the other

waiting for response in untagged traffic.

Send tagged DHCP request

IP DSLAM Runs ManagedIP DSLAM runs Unmanaged

Use IP Address from DHCP

Send untagged DHCP request

DHCP Response

received?

Yes No

DHCP Response

received?

Yes

DHCP Response

Valid?

Yes

Timeout

2 min.

Timeout

2 min.

Change Management VLAN ID

Retrieve Management VLAN ID

from flash

Start-up with

no DHCP Server

Figure 12 IP DSLAM Start-up Without DHCP

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Ericsson EDN312 Guia do Utilizador Página 26