Multilayer Switch: In Transparent Mode w/o STP - packet drops - why?

Unanswered Question

Two Multilayer Switches, working in a Transparent Switching mode without STP, is connected as follows: Station A, Switch A(port 1/1) & Switch B(port 2/1) are connected to Segment A. Station B, Switch A(port 1/2) & Switch B (port 2/2) are connected to Segment B. And also, both Switches has got populated that Stn A is connected in 1/1 & 2/1.

When Stn A send a packet to Stn B, packet is forwarded by both switches to Stn B. However, when Stn B acknowledges back to Stn A, the packet will be dropped by both bridges. Why is it so ?

I have this problem too.
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jrensink78 Fri, 01/25/2008 - 12:41

Not totally following your setup. So is each station plugged into a hub, which is then plugged into the specified switches? That's what I'm guessing by saying that the 2 switch ports and the station are on the same segment.

Are you just doing this out of curiosity? If you were doing this for real, you would want STP turned on to prevent the switching loop. Or you could go to layer 3 between the switches and get the advantage of load balancing and fast convergence.

Not sure off hand why it's dropping. If you turn one switch off, do things start to work?

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