Huawei V100R006C00 Configuration Manual page 14

Quidway S5700 Series Ethernet Switches
Configuration Guide - Device Management
The Auto-Config process can be divided into three phases:
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Issue 01 (2011-07-15)
Startup
After being powered on, an unconfigured switch checks whether there is *.cfg or *.zip file
except the *web.zip and web.zip files in the flash memory, and then takes actions according
to the checking result:
– If the switch detects a configuration file, it loads the configuration file to complete the
startup.
– If the switch does not detect any configuration file, it checks whether Auto-Config is
enabled. If Auto-Config is enabled, the switch starts a 5-minute timer for obtaining a
configuration file and then load the default configuration to complete the startup. If
Auto-Config is disabled, the switch loads the default configuration to complete the
startup.
Obtaining a configuration file when the timer expires
When the timer set for obtaining a configuration file expires, the switch checks whether a
configuration file is saved in the flash memory. If the flash memory does not contain any
configuration file, the switch checks whether it is added to a Huawei Group Management
Protocol (HGMP) cluster. If the switch is not in any HGMP cluster, the switch begins to
obtain a configuration file as follows:
1. Obtaining the IP address and information about the FTP/TFTP server
A switch that does not load any configuration file automatically enables the DHCP
client function on the VLANIF1 interface in Up state. VLANIF1 then broadcasts
DHCP Request packets (presuming that the DHCP server has been configured with
the address pool, Option 150 or Option 14x, and gateway information). Then, the
DHCP server sends the related configurations to the switch, including the IP address
allocated to the switch, IP address of the FTP/TFTP server, FTP user name and
password, and default gateway.
If the switch fails to obtain the IP address of the FTP/TFTP server, it sends DHCP
requests repeatedly until it obtains the IP address.
2. Downloading a configuration file
After the switch that does not load any configuration file obtains the IP address of the
FTP/TFTP server, it accesses the FTP/TFTP server to obtain a configuration file
through Layer 2 or Layer 3 forwarding.
(1) The switch downloads the intermediate file lswnet.cfg from the FTP/TFTP
server.
(2) The switch searches for the name of the required configuration file, and then
downloads the configuration file from the FTP/TFTP server.
(3) If downloading the configuration file fails, the AutoConfig process will be
suspend.
Loading a configuration file
After the configuration file is downloaded successfully, the router is restarted according to
the setting of Option 146. If no Option 146 is configured, the router is restarted immediately
after the configuration file is downloaded.
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