Re: Query about Micrel Kendin switches

[Erik Mouw <erik@xxxxxxxxxxxx>]

On Mon, Jan 31, 2005 at 05:43:06PM -0000, Vanitha Ramaswami wrote:
> I am still not clear on why the PROMISCUOUS mode is not working. We are 
> using the Kendin switch KS8995X  configured to duall MII mode(using the ADI 
> Engineering Coyote board design).  In this mode, the KS8995X acts like "two 
> separate devices".  One is a switch, comprising of PHY ports {1,2,3,4} and 
> the SW-MII port.  The other is a standalone single port PHY, comprising of 
> PHY port 5 and the P5-MII port.
> 
> In our custom IXP425 platform we are using  PHY port 4(ixp0) & 5 (ixp1).
> 
> The PHY port 4 (ixp0) is able to see all the packets that is there in the 
> LAN, whereas i have problem with ixp1.
> 
> IXP1 is also able to receive all the packets in the LAN when it is 
> connected alone to the Ethernet HUB. The problem comes when i put the 
> another IXP425 unit to the Hub. I am able to see only the ARP packets.
> 
> I dont understand why the interface IXP0 ie.(PHY port 4) is able to see all 
> the packets(including the unicast packets) in the LAN, even though i have 2 
> of my custom IXP425 units connected to the Hub.

It's unclear to me what IXP425 port is connected to what part of the
KS8995X, it's not clear to me what that "Ethernet HUB" is (the built-in
switch in the KS8995X, just another hub, or a switch which you call
hub), and also what the "another IXP425 unit" is (the ixp0 interface,
or another ixp425 board).

I think part of the confusion is because you don't understand what the
difference between an ethernet hub and an ethernet switch is. Try this
link:

http://www.google.com/search?q=difference+between+an+ethernet+hub+and+a+switch

Especially the first hit is a good read:

http://www.duxcw.com/faq/network/hubsw.htm


Erik

-- 
----  Erik Mouw  ----  www.bitwizard.nl  ----  +31 15 2600 998  ----

-------------------------------------------------------------------
Subscription options: http://lists.arm.linux.org.uk/mailman/listinfo/linux-arm
FAQ/Etiquette:       http://www.arm.linux.org.uk/armlinux/mailinglists.php