[Bridge] 4 ports bridge problem

czj linuxdemo at 126.com
Sun Sep 21 16:58:21 PDT 2008

Hi all,
I work on a SOC based on AMCC/glacier based on PPC460GT. (
http://WWW.AMCC.com <http://micrel.com/page.do?page=product-info/sys_on_chip.jsp>)
This component has 4 network interfaces. 

Every one is connected to a PC.

eth0 =>
eth1 =>
eth2 =>
eth3 =>

I want to make a bridge with these 4 ports

#brctl addbr br0

#ifconfig br0 netmask

#ifconfig eth0 up

#ifconfig eth1 up

#ifconfig eth2 up

#ifconfig eth3 up

# brctl addif br0 eth0

# brctl addif br0 eth1

# brctl addif br0 eth2

# brctl addif br0 eth3

#brctl stp on

but my problem is that when I used the PC(which IP is to ping other PCs,

the ping reply time from was about 1000ms;
the ping reply time from was about 0.2ms;
the ping reply time form was about 300ms;

Why? and how to configure  the 4 ethernet-ports glacier board to be a bridge or switch correctly? thanks a lot.

Cheng Zijing

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