Ericsson EDN312 Guia do Utilizador descarregar pdf (Página 27)

Function Description

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

Figure 13 on page 23 illustrates the start-up of an IP DSLAM when the

response comes from a standby ECN. The response is not a legal

response and the IP DSLAM skips the timeouts thus reducing the startup

time to approximately 30 seconds.

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

illegal DHCP

response

Figure 13 IP DSLAM Start-up Without DHCP from a Standby ECN

While running in unmanaged mode, the IP DSLAM will keep on polling the

DHCP server approximately one minute after a previous polling is ended.

If the DHCP lease expires and the IP DSLAM cannot renew the license, it

will change the last mode state to unmanaged and restart.

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Ericsson EDN312 Guia do Utilizador Página 27