issue with 4510R switch

Unanswered Question


I have faced issue with 4510R switch (WS-C4510R).

The switch ping response from any local computer is (<10 ms) normally.

But, sometimes it happen that switch ping response become (>30 ms) & then, internet goes down and during above problem, CPU utilization of switch become 100%, but, normally utilization remain 20%.

I have also attached logs. Please suggest any solution


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Kevin Dorrell Tue, 02/16/2010 - 07:59
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Your problem might be related to the log message that says "Duplicate address on Vlan25, sourced by 0021.9be0.82ad".  It looks like you have a rogue or misconfigured router on you network.  Track down that MAC address and you might find the source of your problem.

Kevin Dorrell


Giuseppe Larosa Tue, 02/16/2010 - 09:15
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I agree with Kevin

using IEEE OUI search page the conflicting MAC address

00-21-9B   (hex)          Dell Inc
00219B     (base 16)          Dell Inc

belongs to a DELL

Vlan25 is up, line protocol is up
  Hardware is Ethernet SVI, address is 0016.c72c.3fbf (bia 0016.c72c.3fbf)
  Internet address is

So find out this misconfigured DELL Pc/server

Hope to help


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