Les Mikesell wrote:
On Thu, Feb 7, 2013 at 1:52 PM, m.roth@5-cent.us wrote:
Btw, we are on our own VLAN. The switch is on it.
Is the traffic in question to something directly connected to this switch and just appearing mirrored to the wrong port or perhaps broadcast to all of them? Or is the actual destination on some other switch where this one shouldn't even be in the path? If you want to track the problem down you need to look backwards from the target and figure out why the switches in between did not learn the correct path. It is not likely to be related to the traffic bandwidth unless some intermediate link is flooded to the point that nothing works.
Let's try ASCII art: (campus net)->[vlan]->[new switch in rm. 1]-> server 1 \ -> server 3 ->[switch in rm. 2]->server 2
And he was seeing traffic between 1 and 2 on 3. And he tried another server in rm. 1, and saw it.
Does that make it clearer?
Do you have a huge number of machines on this network? The switches have to store the whole table of all MACs on each side for the ports and a 3750 should default to default to somewhere between 3K and 12K depending on the configuration. A 'show mac address-table count' on the switch should show the number of active entries and the available space. I've never had to fiddle with that, but there should be commands to tune the size and aging times.
No, not huge numbers. The old switch they replaced was a 48 port, of which *maybe* 2-3 were empty. The new -they've got two of them cabled together (and there is much rejoicing). I don't believe *we* can get on their managed switch. *sigh*
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