Re: cam timer tuning

Naufal,

you say your using Nexus without vPC... connected to 4948's , can you give
us more information as to how you have the nexus and 4948's connected and
what configuration they on them. Trying to solve for a an issue with this
little of information is difficult.

JS.

On Fri, Dec 28, 2012 at 10:42 AM, Naufal Jamal <naufalccie_at_yahoo.in> wrote:

> Carlos- unicast flooding due to TCN is understood by design but does it
> really
> go on for 10 minutes?? our network graphs shows spikes for nearly 10
> minutes
> until we do a clear ip arp. This really should not be happening in a stable
> STP environment.. Anyways i am trying the below URL
>
> http://www.cisco.com/en/US/products/hw/switches/ps708/products_tech_note09186
> a00807347ab.shtml#broadcast
>
>
>
>
> ________________________________
> From: Carlos
> G Mendioroz <tron_at_huapi.ba.ar>
> To: Naufal Jamal <naufalccie_at_yahoo.in>
> Cc:
> "ccielab_at_groupstudy.com" <ccielab_at_groupstudy.com>
> Sent: Friday, 28 December
> 2012 3:41 PM
> Subject: Re: cam timer tuning
>
> What makes you believe that the
> difference has anything to do with it ?
> Specially after (correctly) infering
> that TC is causing the flooding!
>
> TC means a MAC could be now anywhere else
> (from a switch standpoint) so
> I guess the solution to your problem (flooding)
> is to get rid of STP :)
>
> -Carlos
>
> Naufal Jamal @ 28/12/2012 06:40 -0300 dixit:
> > Hello,
> >
> > We have a pair of nexus 7K's (without vpc) running HSRP and MSTP.
> > They are connected to access layer switches 4948's. whenever we bring up
> a
> new
> > trunk link between Nexus 7K and 4948 we see unicast flooding caused due
> to
> > TCN's. I am wondering if it has something to do with the difference in
> cam
> > aging timer in both the platforms. Nexus (1800 secs) and 4948 (300
> secs). can
> > anyone put some light here please? I am thinking that changing
> the aging timer
> > on nexus to 300 secs should help.. any thoughts?
> >
> > Naufal
> >
> >
> > Blogs and organic groups at http://www.ccie.net
> >
> >
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> >
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>
> --
> Carlos G
> Mendioroz <tron_at_huapi.ba.ar> LW7 EQI Argentina
>
>
> Blogs and organic groups
> at http://www.ccie.net
> _______________________________________________________________________
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>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
> Subscription information may be found at:
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Blogs and organic groups at http://www.ccie.net
Received on Fri Dec 28 2012 - 10:51:32 ART