Re: CAM Table Problem

It really depends what this size mean.
Only on IOS 1500 means actually 1500 up to layer 3 (i.e. without L2
headers).

On some machines that means pure ICMP size, without IP header (which is 20
bytes, meaning max. packet size is 1480)
So I would run a debug or sniff/span and look at what the actual packet size
is when you ping with, say 1400-byte packet from the host

On Tue, Apr 14, 2009 at 9:16 AM, Mark Stephanus Chandra <
mark.chandra_at_gmail.com> wrote:

> Hi GS,
>
>
>
> I'm just wondering have anyone had the same problem like this before :
>
>
>
>
>
> I have this secenario :
>
>
>
> [IMG]
> http://i481.photobucket.com/albums/rr171/mark_chandra/MACCAMPROBLEM.jpg
> [/IMG]
>
>
>
>
>
> You can See L3 routing on Core 1,
>
>
>
> So if you ping the server from host behind catalyst wih normal size it
> works
> fine and reply
>
>
>
> but if you ping with size of larger than 1450, it will timed out.
>
>
>
> Now when I show my mac-address-table on core 1, there is no mac
> 1111.1111.1111 (132.16.66.6) appear on my CORE 1 CAM, but when I ping it
> 132.16.66.6 from my core 1, it MAC appear 1111.1111.1111 via Port-channel
> 1.
>
>
>
> When it appear, I can ping the server 192.168.1.1 with size of anything
> (above 1450), it will reply. But 40 seconds later the CAM Automatically
> disappear and it wil timed out again the ping packet to the server which is
> it size above 1450.
>
>
>
> I wonder if anyone have ever face this kind of problem ? Can anyone give me
> explanation why this is happen ? Is it a IOS Bug ?
>
> This is really CCIE Test for me and everybody in my country :)
>
>
>
>
>
>
>
>
>
> Regards
>
> Mark Stephanus Chandra - CCIE#23887
>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
>
>
>
>
>
>
>
>

-- 
Pavel Bykov
----------------
Don't forget to help stopping the braindumps, use of which reduces value of
your certifications. Sign the petition at http://www.stopbraindumps.com/
Blogs and organic groups at http://www.ccie.net