Max-.Aging Time
Hallo
We are experiencing a strange behavior in our LAN, the MAC- Addresses of the Workstations that are connected to LAn but not generating traffic are being deleted from the Mac- Address-Table after 10s although the aging - Time is set to 300 s.
Does anybody have an Idea Why.
Thanks
Ali
Hello,
No it is not, the Network where this problem noticed is more complex and it is a topology where the three layers exists ( Core,distribution and access), the problem where noticed on access switches have redundant links. portfast is being used on ports connected to workstation. It so the the the switch loses the mac-addresses of the stations that are directly connected to it after approx.
15 sec.
Thanks
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[edit]
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4506-1#sh mac add aging-time
Vlan Aging Time Configured Aging Time
Global Vlan Admin Age: 300
1 300 300
100 300 300
300 300 300
500 300 300
501 300 300
502 300 300
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we have configured Port-Security on the Cisco Catalyst 3850 Switches on all "access ports" like this:
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After clearing port-security "clear port-security dynamic addressecf4.bb01.078b" everything is fine.Thanks for your reply.
Why shouldn't it work? If I disconnect my PC I have no activity so my mac address should age out.
So if I want to plug it in to another port after the aging time of 2 Minutes my MAC-Address will be learned and I have network connectivity. That's the plan... otherwise I will be locked out. -
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DavidHi ,
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Dan -
Hi there,
Just wondering why, when i do show arp, in my WS-C4506, whith Supervisor II+ 1000BaseX, and cat4000-i9k91s-mz.122-25.EWA5.bin, it seems that i have +/- 20 % of arp entrys with the aging time of 0 sec all the time.
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I have all in the vlan1, and the ip's that soffer this issue are hosts and Cisco equipments.
Thank you in advance.
Petr?nioFriend,
I think you are a little confused with the ARP aging time and the mac-address aging time (also called as CAM table)
The default ARP aging time is 4 hours but the switch hold the CAM table entires only for 5 minutes.
http://www.cisco.com/en/US/products/hw/switches/ps708/products_tech_note09186a00807347ab.shtml#troubleshoot
A permanent ARP entry does not have any timer assoiciated with it and is not shown as "0" but as "-".
The thing which you are seeing is basically the cam is being aged out after 5 mins from the switch and is not incrementing as no frames are being received on the port.
HTH, rate if it does
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