04-07-2009 01:09 PM - edited 03-06-2019 05:03 AM
our client have a c3750-stack by using the stack-wise cable,, there is 6 c3750 stack as 1 switch. we enable the port-security in all the ports for user. the problem is the port random erri-diabled by the mac-address. this mac-address actully learn from another port. for example, f2/0/24 is erri-disable,casue this is by aaaa.aaaa.aaaa,, and this mac-address actully learned from f5/0/43.
after I sh/no-sh the port ,, the port is back to normal.but few hours later,, this thing happened again , and this time ,it is another 2 port involved in.
need help from you guys
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04-07-2009 02:02 PM
We had a similar problem and as part of an additional ssh problem we installed the latest IOS (122-50.SE). Fixed ssh and the problem you mention above.
04-07-2009 01:59 PM
Need more info from you..
1. what is the current aging time set for port-security?
2. For the mac-addresses in conflict that's shutting down the port, what device is it? Laptop?
3. Do you have "sticky" option enabled? From what you described, I think not, but I just to make sure. Don't enable "sticky" option unless you've a real business needs for it.
4. Is it the same mac-add that has been causing the problem or different mac-addresses every time?
5. Sounded like the problem arose after you implemented port-security, is it correct?
6. Can you post the switchport config?
Good luck.
04-07-2009 04:37 PM
thanks for your reply
here is the information:
1. what is the current aging time set for port-security?
it is default setting
2. For the mac-addresses in conflict that's shutting down the port, what device is it? Laptop?
yes,,ladtop,,some of them running VM
3. Do you have "sticky" option enabled? From what you described, I think not, but I just to make sure. Don't enable "sticky" option unless you've a real business needs for it.
no,we don't enable that feature
4. Is it the same mac-add that has been causing the problem or different mac-addresses every time?
no, it is random mac-address.
5. Sounded like the problem arose after you implemented port-security, is it correct?
no, we have run this stack for 3 weeks, and this issue just came last weekend.
6. Can you post the switchport config?
just for example,portf1/0/24
int f1/0/24
sw mo acc
sw acc vlan 74
sw port
sw port max 1
sw port violation restrict
spanning portfast
spanning bpduguard enable
------------------------------------
thx
04-07-2009 02:02 PM
We had a similar problem and as part of an additional ssh problem we installed the latest IOS (122-50.SE). Fixed ssh and the problem you mention above.
04-09-2009 07:31 AM
finnaly , we catched the bad guy,, who is act as a bad dhcp server,,but thanks guys
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