From: Mike Williams (ccie2be@swbell.net)
Date: Tue Aug 19 2003 - 19:29:06 GMT-3
If it is asymmetrical routing, then I'm with Adam, mostly. =) Cisco
will tell you to make the CAM and ARP timeouts match, but we found that
this didn't prevent flooding all together. We set our CAM timout to be
3x the ARP timeout (we believed that 2x would do, but to be safe we did
3x) and that fixed the side-effects of asymmetrical routing.
Here's a good link about it too:
http://www.cisco.com/en/US/products/hw/switches/ps708/products_tech_note
09186a00800a875c.shtml
This doc talks about 6500s, but the same would apply to any pair of
Layer 3 switches setup like this.
HTH,
Mike W.
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
boby2kusa@hotmail.com
Sent: Tuesday, August 19, 2003 4:44 PM
To: Adam Asay; donny.mateo@sg.ca-indosuez.com
Cc: ccielab@groupstudy.com
Subject: Re: Cat 4006 problem
It sounds like an assymetric routing issue. Check the spanning tree and
and check the cam entry make sure it's not anyhting but 300, if it is
the cam is timing out maybe because the packet takes a different path at
layer 2 each time.
----- Original Message -----
From: "Adam Asay" <aasay@cerberian.com>
To: <donny.mateo@sg.ca-indosuez.com>
Cc: <ccielab@groupstudy.com>
Sent: Monday, August 18, 2003 7:47 PM
Subject: Re: Cat 4006 problem
> Donny,
>
> I have heard of this problem happening on 6500's. If it is the same
problem
> you can solve it by changing the cam table and arp table timeouts to
match.
> Try setting the arp table on the L3 module to 5 minutes and see if
> this
helps.
>
>
> Thanks
> Adam
>
> Donny MATEO wrote:
>
> >Hi Guys,
> >
> >Have any of you ever experienced connection problem with cat 4006 +
> >L3
module
> whereby the router intermittenly drop packet.
> >The L3 module seems to have the arp entry needed for it (show arp).
However
> from the L2 module when I do show cam dynamic, the entry for the mac
address
> is missing. I will comeback again sometime and then go missing
> again.....
This
> cause the intermitten
> >problem. I can temporary solve it by configuring static mac address
> >but
of
> course this is not the ideal solutions.
> >Any of you have any idea ?
> >
> >Regards,
> >Donny
> >
> >
> >
> >
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