RE: Query about Micrel Kendin switches

[Vanitha Ramaswami <vanitha@xxxxxxxxxxxxxxxx>]

Hello,

I have confirmed with my hardware engineer, that the IXP0 is connected to 
PHY 5 and IXP1 is connected to the switch interface. Now i am clear why 
IXP1 is not working for me.

Thanks
Vanitha

On Tuesday, February 01, 2005 1:41 AM, George Joseph 
[SMTP:gtj.member@xxxxxxxxxx] wrote:
> Well, I have the same basic setup as you except I use the KS8995M instead 
of
> X.
>
> 2 things.
>
> First all hubs are not created equal.  I bought a Linksys "Hub" to do
> exactly what you're doing only to find out that even though it 
specifically
> said "Hub" it was really a switch and didn't propogate unicast frames to 
all
> ports unless it didn't have the MAC address in its database.  I had to 
try a
> few "Hubs" before I found a Netgear that was a real stupid hub.
>
> Second, you don't mention what address the unicast frames are being sent 
to.
> If it's the mac address of ixp0 then of course it's going to pass through
> the hub and KS.  If you're seeing unicast frames on ixp0 that aren't
> destined for it, then something is seriously wrong. The KS shouldn't 
allow
> it. Is it possible that ixp0 and ixp1 are reversed and it's ixp0 
connected
> to the external PHY 5 and ixp1 connected to MAC 5 switch interface?
>
> -----Original Message-----
> From: Erik Mouw [mailto:erik@xxxxxxxxxxxx]
> Sent: Monday, January 31, 2005 7:01 AM
> To: Vanitha Ramaswami
> Cc: 'George Joseph'; linux-arm@xxxxxxxxxxxxxxxxxxxxxx
> Subject: Re: Query about Micrel Kendin switches
>
>
> 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+  
swit
> ch
>
> 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  ----
>
>
>
> 

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