Aging Time

Hi,
I would like to ask What is Aging Time and its purpose.
Thanks,
Dyep

For the original poster, although Giuseppe provides an excellent description of the MAC aging timer in reference to CAMs, and since you mark his post as resolving your question, I just want to re-emphise in reference to your original question there are multiple aging timers, a couple besides ARP's and CAM's. The principle is generally the same, and such timers might be adjusted for various reasons. (For example, setting ARP and CAM aging timers can make or break unicast flooding.)
[edit]
I wrote too soon, see you've marked my original post as also resolving your question. BTW: The interplay between ARP and MAC aging timer, and how it can cause unicast flooding, I think, is worth knowing. You might want to read http://www.cisco.com/en/US/products/hw/switches/ps700/products_tech_note09186a00801d0808.shtml

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Our new printers are loosing their ip address'es after some time with no use...
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Changing aging-time on vlan for printers. (are there any known caveats changing this?)
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interface FastEthernet0/21
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Why can't modify the vlan aging time

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
503    300             300
600    15              300
I don't do any aging time Settings, why aging time is 15? I don't have change to take effect.

Duplicate post of Why cisco WS-C4506-E Switches High CPU?

How Cisco represent Arp entry's aging time in SNMP MIB

Hi there,
I found : when a laptop roamed between an office and a meeting room and used two different IP addressed in these two places, there are two active IP arp entry in Cisco with different aging time.
Please see the screenshot for "sh ip arp". My question is how Cisco represent the aging time in SNMP MIB. Is there any cisco proprieatry MIB to represent the aging. I want find the latest arp entry from SNMP. I can't see any useful field in ipNetToMediaEntry, ipNetToPhysicalEntry and cInetNetToMediaEntry.
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This value is not available via SNMP.
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Hello,
we have configured Port-Security on the Cisco Catalyst 3850 Switches on all "access ports" like this:
interface GigabitEthernet1/0/1
switchport mode trunk
switchport nonegotiate
switchport port-security
switchport port-security maximum 50
switchport port-security aging time 2
switchport port-security violation restrict
switchport port-security aging type inactivity
I connect my PC to a mini switche and connect this to the first 3850. Everything is working.
Then I connect my PC to the second 3850 -> there is no connection. This is ok because of the aging time of 2 Minutes.
Then I connect my PC to the third 3850 behind a telephone everything is working.
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Switch1#sh mac address-table address ecf4.bb01.078b
          Mac Address Table
Vlan    Mac Address       Type        Ports
2201    ecf4.bb01.078b    STATIC      Gi3/0/31
Total Mac Addresses for this criterion: 1
Switch3#sh mac address-table address ecf4.bb01.078b
          Mac Address Table
Vlan    Mac Address       Type        Ports
2201    ecf4.bb01.078b    STATIC      Gi6/0/24
Total Mac Addresses for this criterion: 1
My MAC-Address isn't aging out. And this means I can't connect to any other Port.
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.

Cdp aging time

Hi all,
I was wondering if anyone know what the default CDP aging time is?
David

Hi ,
show cdp
Global CDP information:
Sending CDP packets every 60 seconds
Sending a holdtime value of 180 seconds
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Arp aging time on router and mac address aging time on switches set close t

Hi,
appreciate some advice on the following:
what is the benefit of setting arp aging time on router and mac address aging time on switches close to each other?
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Hi,
based on the below output, do you think implementing it will benefit? Thanks.
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Full-duplex, 100Mb/s
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Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
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Output queue: 0/40 (size/max)
5 minute input rate 933000 bits/sec, 149 packets/sec
5 minute output rate 2981000 bits/sec, 263 packets/sec
2819781393 packets input, 3782332886 bytes, 0 no buffer
Received 266693 broadcasts (0 multicast)
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0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
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C2950#

ARP Aging Time

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.
I think it should increment that aging time till 300 sec (by default), and then reset, but not all the entries do it.
Any ideias of what kind of "process" is causing it ?
I have all in the vlan1, and the ip's that soffer this issue are hosts and Cisco equipments.
Thank you in advance.
Petr?nio

Friend,
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.
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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
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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

CAM aging time VS Port-security aging time

Hi All
Please advise on the following:
- Without port-security configured, MACs per interface are learnt as "Dynamic" entries and the global CAM aging timer applies (300 seconds) unless tweaked manually.
- With switchport port-security enabled (without port-security mac-address sticky, which holds onto MACs infinitely) I see MACs being learnt as "Secure-Dynamic" in a show port-security interface gix/x output and as "Static" in the output of show mac address-table interface gix.x .
What I want to know is if JUST port-security is applied (without mac-address sticky) do the default CAM aging timer of 300 seconds get applied to these MACs too? as I see their is also a option to configure port-security mac-address aging time / type, does this overrule / take precedence over the default CAM aging timer?
Please assist, its not documented anywhere and its driving me a bit nuts!
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What I want to know is if JUST port-security is applied (without mac-address sticky) do the default CAM aging timer of 300 seconds get applied to these MACs too?
Any aging time you configure with port security will take precedence over the default aging time.
See this thread for details -
https://supportforums.cisco.com/discussion/11054341/switchport-port-security-commands-help
Jon

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Eviction of objects based on aging time and not cache size

Hi
Ii am using a coherence cluster ( extend) and wish to implement an aviction policy for each object inserted into the cache.
From the docs i have read i understand customized eviction policies are ALL size based and not time based ( mean eviction is triggered when cache is full and not when cache object aging time reached ).
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3750 mac-address-aging timer

Hi,
i'm trying to change mac-address timers but having problems, i.e the change Im trying to change mac-address-aging timers but having problems, i.e. the change only applies to existing active vlans. if i add new vlan after changing mac-address-aging timer it will have default value 300. Is this way it works or Im missing something?
3750-sw-1(config)#mac-ad aging-time 1300
3750-sw-1#sh mac-ad ag
Vlan Aging Time
10 1300
20 1300
30 1300
3750-sw-1#! Now adding a new vlan
3750-sw-1#conf t
3750-sw-1(config)#vlan 40
3750-sw-1 (config-vlan
3750-sw-1#sh mac-ad ag
Vlan Aging Time
10 1300
20 1300
30 1300
40 300
New vlan 40 has default value????

Just checked the command reference. In the usage guidelines it states:
Usage Guidelines
If hosts do not send continuously, increase the aging time to record the dynamic entries for a longer time. Increasing the time can reduce the possibility of flooding when the hosts send again.
If you do not specify a specific VLAN, this command sets the aging time for all VLANs.
The last sentence is relevant to your question. The command may also be issued on a particular vlan.
New vlans are created after setting this parameter globally will hence be using the default values.
The key issue to check if this is a bug or not is to check whether the global command is reflected in the config. If it was, I would call the issue a bug.
As it is not, you must approach this as a parameter that can (and should) be set per vlan. After creating a new vlan, you may add this line in the script or re-issue the global command.
Regards,
Leo

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Aging Time

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