L3 catalysts and Etherchannel

Unanswered Question
Sep 28th, 2010

Hi, I have a problem, my network diagram attached to my post. Here is the problem: when I connect my wireshark PC to any port in Vlan 61, I see lots of packet which source and destinations (non broadcast)IP addresses belongs other PC, this behaviour I see on all ports, so in fact my switch working as a hub, it just  deliver some packets to all port in vlan 61. So I decide to to find out what happens, and after few hours I find something strange, If I ping a host B from host A, its pingble but mac address of host B  do not appear on PortChannel1(Catatalyst 2), so this ICMP packet I see on all interfaces vlan 61(and on my wireshark PC I can see it too). After that, I ping host B from host C, its pingble, mac address now appear on portchannel 1(Catatalyst 2), and from this moment everythings good, ping from A to B do not broadcating to all ports in vlan 61, after 5 minutes mac disappeared and again all traffic goes to all port.

Somebody know why so?

thanks

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