[c-nsp] Mac address flapping..

[James Ashton]

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

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