[Bridge] 1 system with 3 bridges

Stephen Hemminger shemminger at osdl.org
Mon Jan 16 08:27:14 PST 2006


ro0ot wrote:

> Hi all,
>
> I have one bridge system (used for controlling bandwidth) connected to 
> three different DSL ISP provider.  I have the following setup below: -
>
> +-------------+
> |   br0             |
> |   -> eth1       | -> DSL_1
> |   -> eth2       |
> +-------------+
> |   br1             |
> |   -> eth3       | -> DSL_2
> |   -> eth4       |
> +-------------+
> |   br2             |
> |   -> eth5       | -> DSL_3
> |   -> eth6       |
> +-------------+
>
> br0 has eth1 and eth2; br0 has no ip address
>
> br1 has eth3 and eth4; br0 has no ip address
>
> br2 has eth5 and eth6; br0 has no ip address
>
> The traffic of DSL_1 ISP will pass thru br0.  The traffic of DSL_2 ISP 
> will pass thru br1.  The traffic of DSL_3 ISP will pass thru br2.
>
> I have a question.  Is it ok I do it as above in 1 system with 3 
> bridges or separate it to 3 system with each system have their own 
> bridge?
>
> Regards,
> ro0ot
>
One system with three bridges will work fine. The only advantage of 
separate systems would be the increased CPU and bandwidth available. As 
long as you are using a fast enough processor and memory, you should be 
fine. A normal 32 bit/33 Mhz PCI bus peaks at about 600 Mbits/sec. 
Double that for 64 bit and double again for 66 Mhz (PCI-X). PCI-express, 
not sure yet.



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