Thank you sir!

you are welcome.. even the fixed version is released now..

http://software.cisco.com/download/release.html?mdfid=284455437&flowid=37775&softwareid=282046477&release=3.3.1SE&relind=AVAILABLE&rellifecycle=ED&reltype=latest

https://tools.cisco.com/bugsearch/bug/CSCuj51372/?reffering_site=dumpcr

We have 2 Cisco 3850 switches with stack , the IOS version is 03.02.01. we found that sometimes PCs cannot access other vlans but the same vlan is fine. After rebooting the 2 3850 switch. everything is working fine. we can make sure that there are no any virus and ARP attack in our network. Is it the same bug as this discussion. Thank you very much.

Hi Jerry,

it doesnt look like we are hitting the same bug. i might require more troubleshooting the stack when the isuse is happening to find what is causing the issue.

could you please check the behavior in 3.3.1 version? i am sure you might not face the issue in 3.3.1.

Thank you for your reply.  I will try to upgrade IOS to 3.3.1.