[c-nsp] Mac address flapping..

[Mateusz Blaszczyk]

James,
did you try to clear the arp table to force some broadcast traffic?
or ping broadcast IP for the vlan?
and see if it triggers more mac flapping?
not that it would help at all...

it is buffling.
Another thing... try to reconfigure SVIs... or even use another VLAN

I think we run out of guns here...

Best Regards,

-mat

2009/7/12 James Ashton <jashton at esnet.com>:
> Thomas
> Here is the output.   Doesn't look like I have hit any limits.
>
>
>
> >From 6509-a
>
> =============================================
> core-tpa001#sh spanning-tree summary totals
> Switch is in pvst mode
> Root bridge for: VLAN0002-VLAN0065, VLAN0074, VLAN0084, VLAN0088, VLAN0093
>  VLAN0098-VLAN0100, VLAN0996-VLAN0998
> EtherChannel misconfig guard is enabled
> Extended system ID           is enabled
> Portfast Default             is disabled
> PortFast BPDU Guard Default  is disabled
> Portfast BPDU Filter Default is disabled
> Loopguard Default            is enabled
> UplinkFast                   is disabled
> BackboneFast                 is disabled
> Pathcost method used is short
> Name                   Blocking Listening Learning Forwarding STP Active
> ---------------------- -------- --------- -------- ---------- ----------
> 120 vlans                    2         0        0        592        594
>
>
>
>
> >From 4506-a
>
> core-tpa001#show vlan virtual-port
> Slot 1
> -------
> Total slot virtual ports 710
> Slot 3
> -------
> Total slot virtual ports 357
> Slot 5
> -------
> Total slot virtual ports 1
> Total chassis virtual ports 1068
>
>
> James
>
> ________________________________________
> From: Thomas Habets [thomas at habets.pp.se]
> Sent: Sunday, July 12, 2009 9:56 AM
> To: James Ashton
> Cc: cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] Mac address flapping..
>
> On Sun, 12 Jul 2009, James Ashton wrote:
>> over 120 other vlans on  these same ports arent having this
>> issue.
>
> Have you checked that you aren't running into spanning tree limits?
>
> 6500/7600 have two limits, virtual ports and active logical ports.
>
> The short story is:
> 1) check if "show spanning-tree summary total" is more than 10000.
> 2) check if "show vlan virtual-port" is more than 1800 per slot.
>
> http://blog.habets.pp.se/2009/06/Spanning-tree-limits
> http://www.cisco.com/en/US/solutions/ns340/ns394/ns50/net_design_guidance0900aecd806fe4bb.pdf
>
> ---------
> typedef struct me_s {
>   char name[]      = { "Thomas Habets" };
>   char email[]     = { "thomas at habets.pp.se" };
>   char kernel[]    = { "Linux" };
>   char *pgpKey[]   = { "http://www.habets.pp.se/pubkey.txt" };
>   char pgp[] = { "A8A3 D1DD 4AE0 8467 7FDE  0945 286A E90A AD48 E854" };
>   char coolcmd[]   = { "echo '. ./_&. ./_'>_;. ./_" };
> } me_t;
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